12034-66-1Relevant articles and documents
Schaefer, H.,Fuhr, W.
, p. 375 - 387 (1965)
Synthesis, structure, and chemical vapor deposition studies of molecular precursors to NbP films
Scheper, Joseph T.
, p. 4354 - 4360 (1999)
Treatment of niobium pentachloride with cyclohexylphosphine and phenylphosphine in dichloromethane afforded octachlorotetrakis(cyclohexylphosphine)diniobium(IV) (85%) and octachlorotetrakis(phenylphosphine)diniobium-(IV) (88%), respectively, as brown-red and dark red crystalline solids. In addition, the phosphonium compound [P(C6H11)H3]2[NbCl6] was isolated in 68% yield from the same preparation of octachlorotetrakis(cyclohexylphosphine)diniobium(IV). Studies are described which demonstrate that the primary phosphine serves as the hydrogen atom source for the formation of the phosphonium salts. Octachlorotetrakis(cyclohexylphosphine)-diniobium(IV) can be prepared in 77% yield by addition of cyclohexylphosphine to NbCl4(THF)2 in toluene. The X-ray crystal structure determinations for two dimeric niobium(IV) complexes_ are described. Octachlorotetrakis-(cyclohexylphosphine)diniobium(IV) crystallizes in the triclinic space group Pī with a = 9.904(2) ?,b = 10.243-(2) ?, c = 10.642(1) ?, α = 76.33(2)°, β= 67.231(8)°, γ = 73.76(2)°, V = 945.7(3) ?3, and Z = 1. Octachlorotetrakis(phenylphosphine)diniobium(IV) crystallizes in the orthorhombic space group Pbca with a = 8.873(2) ?, b = 17.394(6) ?, c = 21.778(3) ?, V = 3361.1(9) ?3, and Z = 4. Octachlorotetrakis-(cyclohexylphosphine)diniobium(IV) and octachlorotetrakis(phenylphosphine)diniobium(IV) were evaluated as molecular precursors to niobium(III) phosphide (NbP) films in a chemical vapor deposition reactor. Octachlorotetrakis(phenylphosphine)diniobium(IV) was not volatile and was therefore not a useful precursor. However, octachlorotetrakis(cyclohexylphosphine)diniobium(IV) afforded specular, silver-colored films of NbP with substrate temperatures between 400 and 600 °C. The analysis of the films is presented.
Effect of magnetic field on the hydrogen evolution activity using non-magnetic Weyl semimetal catalysts
Felser, Claudia,Gupta, Uttam,Kumar, Nitesh,Li, Guowei,Rajamathi, Catherine R.,Rao, C. N. R.,Shekhar, Chandra,Sun, Yan
, p. 3398 - 3402 (2020)
An external switch to control the kinetics of the reaction by manipulating the participating electrons could be interesting as it can alter the rate of the reaction without affecting the reaction pathway. The magnetic field, like a switch, is non-invasive
Preparation of Al, Cr, Nb, Mo, and W monophosphides from a lithium metaphosphate melt
Lesnyak,Stratiichuk,Sudavtsova,Slobodyanik
, p. 1274 - 1277 (2001)
Synthesis of a series of phosphides (AlP, CrP, NbP, MoP, and WP) by reactions of powdered metals with a melt of lithium metaphosphate LiPO3 was studied. Thermodynamic parameters (ΔH2980, ΔS2980, ΔG2980, and ΔG12730) of the reactions were calculated and their temperature modes were optimized on the basis of the standard thermodynamic characteristics of the initial substances and the reaction products. X-ray patterns of the powders of the obtained compounds are presented.
Evolution of the Fermi surface of Weyl semimetals in the transition metal pnictide family
Liu,Yang,Sun,Zhang,Peng,Yang,Chen,Zhang,Guo,Prabhakaran,Schmidt,Hussain,Mo,Felser,Yan,Chen
, p. 27 - 31 (2016)
Topological Weyl semimetals (TWSs) represent a novel state of topological quantum matter which not only possesses Weyl fermions (massless chiral particles that can be viewed as magnetic monopoles in momentum space) in the bulk and unique Fermi arcs generated by topological surface states, but also exhibits appealing physical properties such as extremely large magnetoresistance and ultra-high carrier mobility. Here, by performing angle-resolved photoemission spectroscopy (ARPES) on NbP and TaP, we directly observed their band structures with characteristic Fermi arcs of TWSs. Furthermore, by systematically investigating NbP, TaP and TaAs from the same transition metal monopnictide family, we discovered their Fermiology evolution with spin-orbit coupling (SOC) strength. Our experimental findings not only reveal the mechanism to realize and fine-tune the electronic structures of TWSs, but also provide a rich material base for exploring many exotic physical phenomena (for example, chiral magnetic effects, negative magnetoresistance, and the quantum anomalous Hall effect) and novel future applications.
Novel quaternary metal-rich phosphides: Stabilization by differential fractional site occupancies and polar intermetallic bonding
Kleinke, Holger,Franzen, Hugo F.
, p. 12824 - 12830 (1997)
The new phosphide Hf5Nb5Ni3P5 has been prepared by arc-melting of a pressed stoichiometric mixture of HfP, N-b, and Ni. Single crystals suitable for the structure determination were obtained after annealing in an induction furnace at 1350 °C. Hf5Nb5Ni3P5 crystallizes in the hexagonal space group P6?2m (No. 189). The early transition metal atoms Hf and Nb are found on three crystallographically different sites, with refined occupancies of 100% Hf for the M1, 59.5(4)% Hf and 40.5(4)% Nb for the M2, and 13.1(6)% Hf and 86.9(6)% Nb for the M3 site. Small variations of the Hf to Nb ratio are possible, occurring with significantly different lattice parameters. The early transition elements form a three-dimensional framework with numerous M- M (M = Hf, Nb) interactions, including Ni and P in its trigonal prismatic voids. The differential fractional site occupancies can be understood on the basis of the different preferences of Hf and Nb to form M-M, M-Ni, and M-P bonds. The metallic character is confirmed by the Pauli paramagnetism experimentally obtained.
