- The effect of Sm-doping on optical properties of LaB6 nanoparticles
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Nanocrystalline particles of LaB6, SmB6 and Sm-doped LaB6 have been prepared by a solid-state reaction in order to investigate the optical properties of ternary rare-earth hexaborides. The sizes of prepared nanoparticles range from dozens to more than 200 nm, as confirmed by XRD, SEM and TEM examinations. The optical property concerning the absorption spectra was tested with ultraviolet-visible-near infrared (UV-vis-NIR) absorption spectrum. All samples exhibit high absorbance in NIR range and UV range. The increase of Sm-doping amount shifts the position of minimum absorptance value of LaB6 to the long-wave direction. Density functional theory (DFT) is employed to interpret the optical properties of Sm-doped LaB6, and results indicate that Sm 4f states change the DOS at near Fermi surface of LaB6 after Sm doping and the reduced number of conduction electrons results into the change of absorption spectra.
- Chao, Luomeng,Bao, Lihong,Shi, Junjie,Wei, Wei,Tegus,Zhang, Zhidong
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- Unique preparation of hexaboride nanocubes: A first example of boride formation by combustion synthesis
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Nanocubes of LaB6 and Sm0.8B6 have been synthesized using low-temperature combustion synthesis, a technique that had only been used previously for the preparation of oxides. The hexaboride nanocubes were prepared using lanthanum nitrate or samarium nitrate, carbohydrazide, and boron powders. The furnace temperature for synthesis was kept at 320°C, lower than the typical temperature values used in combustion processes for the preparation of oxides. After synthesis, the nanocubes were characterized using X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. The combustion process was analyzed using differential scanning calorimetry, which shows that the formation of the carbohydrazide and nitrate melts as well as the formation of a complex between metal ions and carbohydrazide are crucial steps for the reaction. The technique results in high-purity powders with a unique cubic morphology, in which the corners of the cubes can be used as point sources for efficient electron emission
- Kanakala, Raghunath,Rojas-George, Gabriel,Graeve, Olivia A.
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- Peculiarities of electronic, phonon and magnon subsystems of lanthanum and samarium tetraborides
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Abstract Experimental research was carried out to study the temperature dependences of heat capacity Cp(T = 2-300 K), lattice parameters a(T), and c(T), (5-300 K) of lanthanum and samarium tetraborides. A comparison with data obtained previously for LuB4 reveals the peculiar influence of lanthanide contraction and the rare-earths mass on the thermodynamic properties of rare earth tetraborides at low and high temperatures. Sharp anomalies were found in the heat capacity and thermal expansion for SmB4 at TN = 25.1 K, conditioned by the phase transition into antiferromagnetic state. The more poorly defined heat capacity anomaly around 7 K is referred to the quadrupole orbital fluctuation of the atomic magnetic moments for Sm3+ ions. The electronic, lattice, and magnetic contributions to the heat capacity and thermal expansion of samarium tetraboride were defined. Our approach makes it possible to adequately approximate the lattice components of heat capacity and thermal expansion by combining the Debye and Einstein contributions, which are based on the joint analysis of calorimetric and X-ray data. The influence of the frustration of the atomic magnetic moment system for Sm3+ ions on the thermodynamic characteristics of the samarium tetraboride magnetic phase transition was revealed.
- Novikov,Mitroshenkov,Matovnikov
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- Low temperature carbothermal and boron carbide reduction synthesis of LaB6
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Rare-earth hexaborides are widely used as thermionic emitters however their economic production for large scale applications such as solar thermionic electricity generation is hampered by a need to synthesise them at lower temperature without post-synthesis cleaning treatments. Two simple synthesis techniques for producing pure lanthanum hexaboride (LaB6), carbothermal reduction using La2O3-boroncarbon and boron carbide reduction using La2O3-B4C blends respectively were studied. Using fine grained starting materials and a mild pre-milling treatment, the carbothermal method was found to produce high-purity LaB6 at a temperature 1400 °C or below. The B4C method also appeared from XRD and SEM analyses of abraded surfaces to produce high-purity LaB6 at 1400 °C however EDS maps of polished cross-sections revealed the presence of unreacted B4C necessitating a temperature of 1450 °C to complete the reaction. XRD and SEM analyses indicate that the mean particle sizes of LaB6 using the boron carbide method (220 nm) is smaller than that for the carbothermal reduction method (600 nm). The finer grains of samples prepared via the boron carbide method result in a partially sintered powder. LaB6 prepared in this way is shown to have a Richardson work function of 2.64 eV.
- Hasan, Muhammad,Sugo, Heber,Kisi, Erich
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- A solvothermal approach for the preparation of nanostructured carbide and boride ultra-high-temperature ceramics
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The use of a solvothermal process for the synthesis of tantalum carbide (TaC) and lanthanum hexaboride (LaB6) powders in fused-quartz test tubes is reported in order to demonstrate the synthesis of these powders using thermal and chemical ignition techniques and to prove that the process is of a self-propagating high-temperature synthesis type, obviating the need for an autoclave. X-ray powder diffraction showed phase pure powders with crystallite sizes of 25 and 80 nm, while dynamic light scattering showed average particle sizes of 97 and 130 nm, for TaC and LaB6, respectively. The data demonstrates that the powders have a very low level of agglomeration. Scanning electron microscopy shows that the TaC powders have a spherical morphology, while the LaB6 powders have a mixture of cubic and spherical morphologies.
- Kelly, James P.,Kanakala, Raghunath,Graeve, Olivia A.
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- Phonon structure of LaB6 by point-contact spectroscopy
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The differential resistance dV/dI versus voltage characteristics is studied for point-contacts between a LaB6-needle on one side and a LaB 6 (100)-cleavage surface on the other. A technique of automatic in situ cleaning is used to clean the sample surface. The spectra of pure metal point-contacts are contrary to that of the tunneling contacts interposed by the oxide layer, that is, the former is for the barrierless junction of enough clean surface and the latter is for the barrier-type junction of intentionally oxidized surface. The measurements of the second derivative d 2K/dI2 give the information on the phonon density of states of LaB6, adding new experimental results on the current neutron scattering experiment. The peaks of the phonon density of states of LaB6 are situated at 12, 24, 38 and 50 meV.
- Kunii, Satoru
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- A low-temperature route for the synthesis of nanocrystalline LaB6
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Nanocrystalline lanthanum hexaboride (LaB6) with mean particle size of 30 nm has been successfully synthesized at 400 °C in an autoclave starting from metallic magnesium powder, NaBH4 and LaCl3. In this case, by using B2O3 instead of NaBH4, LaB6 nanocubes with mean size of ~200 nm were formed at 500 °C. The X-ray diffraction (XRD) pattern can be indexed as cubic LaB6 with the lattice constant of a=4.151 A for LaB6 nanoparticles and 4.154 A for LaB6 nanocubes. An atomic ratio of La and B as 1:5.94 was determined from EDS for LaB6 nanoparticles. XPS data of LaB6 nanocubes indicate the atomic ratio of La to B as 1:5.95. Raman spectra indicate the formation of LaB6.
- Zhang, Maofeng,Yuan, Liang,Wang, Xiaoqing,Fan, Hai,Wang, Xuyang,Wu, Xueying,Wang, Haizhen,Qian, Yitai
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- Low-temperature synthesis of nanosized metal borides through reaction of lithium borohydride with metal hydroxides or oxides
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In this study, we report a novel and facile synthesis approach of boron-rich transition metal borides such as LaB6 and TiB2 through reaction of lithium borohydride (LiBH4) with corresponding metal hydroxide or oxide at temperatures below 600 °C. A fast endothermic reaction occurred at around 350 °C in the ball milled mixture of 6LiBH4 + La(OH)3 or 12LiBH4 + La2O3, efficiently producing crystalline LaB6 nanoparticles of a size smaller than 100 nm. In comparison, the reaction of LiBH4 with TiO2 proceeded within a wide temperature range from 120 °C to 500 °C, resulting in the formation of nanocrystalline TiB2 of only a few nanometers. This synthesis method proved to be a facile and general route to fabricate nanosized transition metal borides.
- Pan, Wei Yuan,Bao, Qian Wen,Mao, Yang Jun,Liu, Bin Hong,Li, Zhou Peng
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- Development of chemically synthesized spherical plasmonic LaB6 nanoparticles for biomedical applications
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LaB6 is a unique plasmonic material, for which the localized surface plasmon resonance (LSPR) absorption band intrinsically lies in the near infrared (NIR) region. In this work, we synthesized spherical LaB6 nanoparticles with a tunable size within 50–200 nm. The optical properties of these LaB6 nanospheres were found to be sensitive to the thickness of surface oxide layer that was formed during the synthesis, purification and dispersion processes. In order to enhance the stability of LaB6 nanoparticles in aqueous environment, LaB6@SiO2 with a core-shell structure was successfully prepared. Both LaB6 and LaB6@SiO2 demonstrated low cytotoxity in biomedical tests when their concentrations were limited to 0.2 mg mL?1. The in vitro photothermal therapy experiment showed that 4T1 cancer cells were eventually apoptotic after being exposed to a 980 nm laser for 5 min at a considerably low power density of 0.82 W cm?2 and a low dose of 0.1 mg mL?1 for LaB6@SiO2. The results suggest that these LaB6 nanospheres are viable photothermal agents for biomedical applications.
- Wang, Yu,Fang, Chao,Li, Xiang,Li, Zhou Peng,Liu, Bin Hong
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- Single-crystalline LaB6 nanowires
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Lanthanum hexaboride nanowires produced by chemical vapor deposition are single-crystalline and grown along the [111] direction. Streaks appearing in the electron diffraction spots indicate the lateral direction perpendicular to the nanowire growth axis.
- Zhang, Han,Zhang, Qi,Tang, Jie,Qin, Lu-Chang
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- Fabrication and characterization of ZrB2-based ceramic using synthesized ZrB2-LaB6 powder
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ZrB2-LaB6 powder was obtained by reactive synthesis using ZrO2, La2O3, B4C, and carbon powders. Then ZrB2-20 vol% SiC-10 vol% LaB6 (ZSL) ceramics were prepared from co
- Spring, Alex,Guo, Wei-Ming,Zhang, Guo-Jun,Wang, Pei-Ling,Krstic, Vladimir D.
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- Origin of ground state anomaly in LaB6 at low temperatures
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The authors investigate the temperature evolution of the electronic structure of La B6, a widely used material as high brightness cathode, using UV photoemission spectroscopy with state-of-the-art energy resolution (1.4 meV) and band structure calculations in order to probe the origin of low temperature anomaly in its physical properties. Comparison of experimental and theoretical results suggests that electron correlation is not significant in this system and that the electronic states in the vicinity of the Fermi level, F, possess mixed character. High resolution spectra at different temperatures T reveal a pseudogap for T100 K, which evolves gradually with the decrease in temperature.
- Medicherla,Patil, Swapnil,Singh, Ravi Shankar,Maiti, Kalobaran
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- Low temperature synthesis of low thermionic work function (LaxBa1-x)B6
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This study presents investigations of the microstructure, morphology and emission properties of the promising thermionic material (LaxBa1-x)B6. The material was synthesised by solid-state reaction without post-synthesis purifications. Powder X-ray diffraction revealed that samples prepared at a temperature ≥1500 °C had formed a significant proportion of solid solution (above 54 mass%). Subsequent sintering at 1950 °C caused the formation of a mixture of three solid solutions with the dominant phase being (La0.31Ba0.69)B6 ~85% (by mass). The Richardson work function and emission constant for this boride mixture were found to be 1.03 eV and 8.44 × 10-6 A cm K-2 respectively.
- Hasan,Cuskelly,Sugo,Kisi
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- Low temperature synthesis and characterization of pure lanthanum hexaboride nanocrystals
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This study aims to synthesize very pure form of LaB6 nanocrystals at low temperatures. The synthetic route employed involved low temperature magnesiothermic reduction process of La2O3 with a mixture of Mg, I2 and B2O3 at 90 °C. The powder mixtures were mechanically induced under Ar atmosphere for 3 h and then heat treated. The pure form of nano LaB6 powder produced by this technique is by far the most versatile route for the synthesis of nano-LaB6. From the XRD evidences of the synthesized powders, a correct reaction path for the reduction process has been elucidated. The average particle size of nano powder synthesized was estimated from SEM as well as XRD as 78 ± 12 nm and 61.3 ± 2.0 nm respectively, and the values were found to be in good agreement. The particle size determined by XRD was upon applying the Rietveld refinement method and using isotropic Lorentzian Scherrer particle broadening parameter (LX) of refined peak profiles. From the average size of the particulates and from the specific surface area of LaB6 (1.3 m2/g) as determined by BET method, the number of unit crystals that might have constituted a nano-particulate of size 61.3 ± 2.0 nm was estimated as 105 numbers from the crystallographic information of LaB6.
- Simsek, Tuncay,Chattopadhyay, Arun K.,Baris, Mustafa,Bilen, Murat
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- The preparation and composition design of boron-rich lanthanum hexaboride target for sputtering
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Lanthanum Hexaboride (LaB6) nano-film has been proved to be promising transparent thermal insulation material, while its properties are limited on purity and composition. High-purity LaB6 polycrystalline powder was prepared through boron carbide reduction method in this work. A series of techniques such as scanning electron microscopy, X-ray diffraction, laser particle analyzer and inductively coupled plasma emission spectrometer were employed to characterize LaB6 powder. As raising the content of La2O3 in reactants, more uniform, finer (2.686 μm) and purer (99.5139 wt%) LaB6 powder is prepared, with only 0.4434 wt% residual B4C. The density of targets increases with the rise of sintering temperature and the extension of sintering time, while crystallite size increases simultaneously with the extension of sintering time. The introduction of B powder in target is conductive to sintering process, increasing hardness and flexural strength of targets. X-ray photoelectron spectrometer was used to characterize the composition and microstructure of LaB6 nano-film which is tentatively considered to be composed of LaB6 nanocrystalline and amorphous microstructure of La and B atoms. The film LaB6.0627±0.02 was obtained when the ratio of B and La of sputtering target reached 12.5. The thickness and deposition rate decrease with the increase of B content in targets.
- Chen, Defang,Min, Guanghui,Wu, Yan,Yu, Huashun,Zhang, Lin
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- Chemical vapor deposition of metal borides 7. The relatively low temperature formation of crystalline lanthanum hexaboride thin films from boron hydride cluster compounds by chemical vapor deposition
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The chemical vapor deposition (CVD) of high quality polycrystalline thin films of lanthanum hexaboride, LAB6, was achieved through the vacuum copyrolysis of the boron hydride clusters, nido-pentaborane(9) [B5H9] and nido-d
- Kher,Spencer
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- Self-catalyst growth of LaB6 nanowires and nanotubes
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LaB6 nanowires have been successfully fabricated with self-catalyst method using lanthanum (La) powders and boron trichloride (BCl3) gas mixed with hydrogen and argon. Our results show that lanthanum hexaboride (LaB6) nanowires are 20-200 nm thick and several micrometers long. Transmission electron microscopy (TEM) reveals that the nanowires are highly crystalline. In our experiment LaB6 nanotubes have also been observed for the first time. Our results indicate that LaB6 nanotubes are polycrystalline with 200-400 nm thick and around several hundred nanometers to one micrometer long. A growth mechanism based on the self-catalyst process is proposed for the formation of the nanowires.
- Xu, Junqi,Zhao, Yanming,Zou, Chunyun
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- Preparations of lanthanum hexaboride (LaB6) and cerium hexaboride (CeB6)
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Due to strong anti-poisoning ability, good emission stability, high emission current density, lanthanum hexaboride (LaB6) and cerium hexaboride (CeB6) have been maturely applied in electron emission emitter. In this paper, a new manufacturing method for LaB6 (or CeB6) powder was proposed by using La2O3 (or CeO2), B4C, and Al as raw materials. After high-temperature reaction in the range of 1673–1773?K and the following alkaline leaching at 90°C, LaB6 or CeB6 powder with particle size of about 10?μm was obtained. Furthermore, by Al metal flux method, the obtained powder was used to manufacture single crystal block with size of several millimeters.
- Wang, Yu,Chou, Kuo-Chih,Zhang, Guo-Hua
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p. 1954 - 1966
(2021/11/24)
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- Structural, magnetic, and thermionic emission properties of multi-functional La1-xCaxB6 hexaboride
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Herein, we report the synthesis of nanocrystalline La1-xCaxB6 (0 ≤ x ≤ 1) hexaboride powders by solid-state reaction and their subsequent consolidation via spark plasma sintering. The structural, magnetic and thermionic emission properties of La1-xCaxB6 hexaboride are investigated. All of the synthesized nanocrystalline hexaboride powders are single phase with the CsCl-type structure and no ferromagnetic impurity phases have been detected from X-ray diffraction. Magnetic measurements show that weak ferromagnetism at room temperature is found in nanocrystalline La1-xCaxB6 hexaboride powders, and the magnetism was attributed to the presence of the intrinsic defects, based on the data of the HRTEM. Thermionic emission measurements indicate that the maximum emission intensity for bulk La0.4Ca0.6B6 at 1873 K reached 20.02 A/cm2, which is more than three times higher as compared to bulk CaB6 (~6.04 A/cm2). When the La doping was increased to 40 at%, the work function of CaB6 decreased from 2.95 to 2.76 eV, indicating an improvement in the thermionic emission performance. Therefore, the quasibinary La1-xCaxB6 hexaboride may have an application as a promising cathode.
- Bao, Lihong,Qi, Xiaoping,Bao, Tana,Tegus
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p. 332 - 338
(2017/10/17)
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- Low temperature carbothermal and boron carbide reduction synthesis of LaB6
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Rare-earth hexaborides are widely used as thermionic emitters however their economic production for large scale applications such as solar thermionic electricity generation is hampered by a need to synthesise them at lower temperature without post-synthesis cleaning treatments. Two simple synthesis techniques for producing pure lanthanum hexaboride (LaB6), carbothermal reduction using La2O3-boron-carbon and boron carbide reduction using La2O3-B4C blends respectively were studied. Using fine grained starting materials and a mild pre-milling treatment, the carbothermal method was found to produce high-purity LaB6 at a temperature 1400 °C or below. The B4C method also appeared from XRD and SEM analyses of abraded surfaces to produce high-purity LaB6 at 1400 °C however EDS maps of polished cross-sections revealed the presence of unreacted B4C necessitating a temperature of 1450 °C to complete the reaction. XRD and SEM analyses indicate that the mean particle sizes of LaB6 using the boron carbide method (220 nm) is smaller than that for the carbothermal reduction method (600 nm). The finer grains of samples prepared via the boron carbide method result in a partially sintered powder. LaB6 prepared in this way is shown to have a Richardson work function of 2.64 eV.
- Hasan, Muhammad,Sugo, Heber,Kisi, Erich
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p. 176 - 182
(2015/02/02)
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- Destabilization of LiBH4 by (Ce, La)(Cl, F)3 for hydrogen storage
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The mixtures of LiBH4 with halides of Ce or La in a molar ratio of 3:1 were investigated to explore their hydrogen storage properties. The ball milling of LiBH4 with chloride of Ce or La yielded Ce(BH 4)3 and La(BH4)3, while fluoride of Ce or La did not react with LiBH4 during extended ball milling at room temperature. The dehydrogenation temperatures of the ball-milled mixtures were reduced to 220-320 °C, which were much lower than that of pure LiBH4. The diborane emission during hydrogen release was observed at a low level. The dehydrogenation temperature is found to be affected by the composition of rare earth halides, but less influenced by ball milling time. The endothermic dehydrogenation reactions produced lithium halides, hydrides and borides of the corresponding rare earth element. Moreover, the LiBH4 + 1/3(Ce, La)(Cl, F)3 showed partial reversibility through the formation of an unknown borohydride, allowing for a potential hydrogen storage system.
- Zhang, Bang Jie,Liu, Bin Hong,Li, Zhou Peng
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p. 751 - 757
(2011/02/24)
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- Solar control dispersions and coatings with rare-earth hexaboride nanoparticles
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Nanoparticle dispersions of rare-earth hexaborides have been prepared using a media agitation mill and have been examined for optical properties. High visible light transmittance coupled with strong absorption in the near-infrared (NIR) wavelengths suitable for solar control windows are reported for hexaboride nanoparticle dispersions with particle size dependence and the effect of artifacts. Nanoparticulate LaB6 shows the largest NIR absorption among rare-earth hexaborides. NIR absorption is considered to arise from the free electron plasmon resonance. On decreasing the particle size below 120 nm, both visible light transmittance and NIR absorption are found to increase gradually until the size of 18-26 nm when they reach the maximum, and then decrease again at below 18 nm. Zirconia contamination and formation of lanthanum oxide were found to be involved during the milling process, leading to small additional absorptions around 300 and 650 nm, respectively.
- Takeda, Hiromitsu,Kuno, Hiroko,Adachi, Kenji
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p. 2897 - 2902
(2009/02/05)
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- Raman scattering investigation of RB6 (R = Ca, La, Ce, Pr, Sm, Gd, Dy, and Yb)
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The excitation-energy, polarization, and temperature dependeces of Raman scattering spectra have been measured for the RB6 crystals (R=Ca 2+, La3+, Ce3+, Pr3+, Sm 2.6+, Gd3+, Dy3+, and Yb2+). In the divalent crystals of CaB6 and YbB6, the Eg phonon shows doublet, while the line shape is a broad single peak for the trivalent case. In the trivalent crystals, two kinds of the extra peaks have been clearly observed at around 200 cm-1 and at around 1400 cm -1 in addition to the Raman-active phonons and crystal electric-field (CEF) excitations. The peak intensities at around 200 cm -1 show the anomalous decrease with decreasing temperature, and this temperature dependence correlates with that of the mean-square displacement of the R ion. Furthermore, their energies decrease with the increase of the cage space due to B6. These peaks are originated from the second-order excitation of acoustic phonons. The broad peak at around 1400 cm-1 is assigned as the second-order excitation of the T2g phonon. For the T2g phonon, the energy difference and its line-shape change between the trivalent and divalent crystals suggests the existence of electron-phonon interaction. We have observed the CEF excitation in PrB 6 and have obtained the Lea, Leask, and Wolf parameters with x=0.94 and W=9.2 K.
- Ogita, Norio,Nagai, Shinji,Okamoto, Naoki,Udagawa, Masayuki,Iga, Fumitoshi,et al.
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- Local and average crystal structure and displacements of La11B6 and EuB6 as a function of temperature
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Measurements of both the average crystal structure from Rietveld refinement of neutron powder diffraction data and the local structure from La LIII-edge x-ray-absorption fine structure (XAFS) are presented for a La11B6 sample as a function of temperature (~10-320 K). These data are compared to XAFS results on a EuB6 sample. The single-site La and B positional distribution widths and the La-B and La-La bond length distribution widths and their temperature dependence are compared. This comparison allows an estimate of the La and B site displacements, and we find that these sublattices are only slightly correlated with each other. Moreover, while the temperature dependence of the displacement parameters of the average sites obtained from diffraction fit an Einstein model well, the temperature dependence of the La-B bond length distribution width requires at least two vibrational frequencies, corresponding to the La and B frequencies of the individual sites. XAFS data on EuB6 indicate that the situation is the same in the Eu compound. In addition, comparisons between data taken below and above the ferromagnetic transition temperature for EuB6 place stringent limits on the lattice involvement in the associated metal-insulator transition and the ensuing large magnetoresistance effect. This lack of lattice involvement in the magnetoresistance transition is in sharp contrast to the strong lattice involvement observed in the colossal magnetoresistance lanthanum manganese perovskites.
- Booth, C. H.,Sarrao, J. L.,Hundley, M. F.,Cornelius, A. L.,Kwei, G. H.,et al.
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- Low-temperature heat capacity and characteristic thermodynamic functions of lanthanum hexaboride
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The isobaric heat capacity of a lanthanum hexaboride single crystal was measured in the temperature range 5-300 K. The electronic and lattice contributions to the heat capacity were determined. The temperature dependences of the enthalpy, entropy, and Gibbs energy were calculated, and the standard values of these thermodynamic functions were found.
- Sirota,Novikov,Vinokurov,Paderno
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p. 1785 - 1788
(2007/10/03)
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- Thermodynamic properties of the rare earth borides and carbides in a wide temperature range
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For the first time a systematic study was made of the heat capacity and enthalpy of the rare earth tetra- and hexaborides and sesqui- and dicarbides in the temperature range 60-2300 K.
- Bolgar, A. S.,Muratov, V. B.,Blinder, A. V.,Kryklya, A. I.,Suodis, A. P.
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p. 127 - 128
(2008/10/08)
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- Thermodynamic characteristics of lanthanum and neodymium borohydrides
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Desolvation and thermal decomposition of lanthanum and neodymium borohydrides tetrahydrofuran adducts are investigated by tensimetry with a membrane null manometer.The processes are found to occur stepwise.The mechanisms of the processes are established on the basis of the tensimetric and X-ray phase data.The thermodynamic characteristics of pure La and Nd borohydrides are determined.
- Mirsaidov, U.,Badalov, A.,Khikmatov, M.,Nazarov, K.,Marufi, V. K.
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p. 1543 - 1545
(2007/10/02)
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- 11B NUCLEAR QUADRUPOLE INTERACTION IN METAL HEXABORIDES (MB6).
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The objective of this work is to discuss the bonding nature of the hexaborides on the basis of the experimental results on the **1**1B nuclear electric quadrupole interaction.
- Aono,Kawai
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p. 797 - 802
(2008/10/09)
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