176
M. Sahu et al. / Thermochimica Acta 525 (2011) 167–176
References
2
1
0
[1] R. Saha, R. Babu, K. Nagarajan, C.K. Mathews, Thermodynamic properties of
ternary oxides of fission products from calorimetric measurements, J. Nucl.
Mater. 167 (1989) 271–277.
[2] M. Stan, T.J. Armstrong, D.P. Butt, T.C. Wallace, Y.S. Park, C.L. Haertling, T. Hart-
mann, R.J. Hanrahan, Stability of the perovskite compounds in the Ce–Ga–O
and Pu–Ga–O systems, J. Am. Ceram. Soc. 85 (2002) 2811–2816.
[3] L.M. Lopato, V.N. Pavlikar, L.I. Lugin, New compounds in the La2O3–SrO and
Ce2O3–SrO systems, Russ. J. Inorg. Chem. 14 (3) (1969) 449–450.
[4] H. Iwahara, T. Esaka, H. Uchida, N. Maeda, Proton conduction in sintered oxides
and its application to steam electrolysis for hydrogen production, Solid State
Ionics 3/4 (1981) 359–363.
[5] H. Iwahara, Proton conducting ceramics and their applications, Solid State Ion-
ics 86–88 (1996) 9–15.
-1
-2
-3
(SrCeO3(s))
(Sr2CeO4(s))
V(SrCeO3(s))
V(Sr2CeO4(s))
[6] H. Matsumoto, S. Hamajima, H. Iwahara, Electrochemical hydrogen pump using
SrCeO3 based proton conductor: effect of water vapor at the cathode on the
pumping capacity, J. Electrochem. Soc. 148 (10) (2001) D121–D124.
[7] H. Iwahara, Technological challenges in the application of proton conducting
ceramics, Solid State Ionics 77 (1995) 289–298.
[8] F. Shimojo, Absorption mechanism of proton on perovskite oxide surface, Solid
State Ionics 179 (2008) 807–810.
[9] Z. Yongqing, Z. Xueling, Y. Guozhong, M. Yuan, Y. Sumei, G. Zaihong, Synthesis
and luminescent properties of superfine Sr2CeO4 phosphors by sol–gel auto
combustion method, J. Rare Earths 24 (2006) 281–284.
200
400
600
800
T/ K
1000
1200
1400
[10] E. Danielson, M. Devenney, D.M. Giaquinta, J.H. Golden, R.C. Haushalter, E.W.
McFarland, D.M. Poojary, C.M. Reaves, W.H. Weinberg, X.D. Wu, A rare-earth
phosphor containing one-dimensional chains identified through combinatorial
methods, Science 279 (1998) 837–839.
Fig. 11. The percentage variation of density and volume of SrCeO3(s) and Sr2CeO4(s)
with temperature.
[11] E. Danielson, M. Devenney, D.M. Giaquinta, J.H. Golden, R.C. Haushalter, E.W.
McFarland, D.M. Poojary, C.M. Reaves, W.H. Weinberg, X.D. Wu, X-ray powder
structure of Sr2CeO4: a new luminescent material discovered by combinatorial
chemistry, J. Mol. Struct. 470 (1998) 229–235.
[12] S. Gopalan, A.V. Virkar, Thermodynamic stabilities of SrCeO3 and BaCeO3
using a molten salt method and galvanic cells, J. Electrochem. Soc. 140 (1993)
1060–1065.
[13] R. Pankajavalli, K. Ananthasivan, S. Anthonysamy, P.R. Vasudeva Rao, Thermo-
dynamic stabilities of SrCeO3 and Sr2CeO4 using the fluoride EMF technique, J.
Nucl. Mater. 336 (2005) 177–184.
[14] A.N. Shirsat, K.N.G. Kaimal, S.R. Bharadwaj, D. Das, Thermodynamic stability of
SrCeO3, J. Solid State Chem. 177 (2004) 2007–2013.
[15] S. Yamanaka, K. Kurosaki, T. Oyama, H. Muta, M. Uno, T. Matsuda, S. Kobayashi,
Thermophysical properties of perovskite-type strontium cerate and zirconate,
J. Am. Ceram. Soc. 88 (6) (2005) 1496–1499.
[16] S. Yamanaka, K. Kurosaki, T. Matsuda, S. Kobayashi, Thermal properties of
SrCeO3, J. Alloys Compd. 352 (2003) 52–56.
[17] E.H.P. Cordfunke, A.S. Booij, M.E. Huntelaar, The thermochemical properties of
BaCeO3(s) and SrCeO3(s) from T = (5–1500) K, J. Chem. Thermodyn. 30 (1998)
437–447.
[18] A.N. Shirsat, K.N.G. Kaimal, S.R. Bharadwaj, D. Das, Thermodynamic stability of
Sr2CeO4, Thermochim. Acta 447 (2006) 101–105.
[19] S.K. Rakshit, S.C. Parida, Mohini, Z. Singh, B.K. Sen, Thermodynamic stabili-
ties of strontium and barium cerates using Knudsen effusion quadrupole mass
spectrometry, J. Alloys Compd. 505 (2010) 302–308.
[20] J.L. Drummond, R.A. Grant, Potentiometric determination of plutonium by
argentic oxidation, ferrous reduction and dichromate titration, Talanta 13
(1966) 477–488.
[21] PCPDFWIN, Version 2.2, June 2001, JCPDF Card No. 47-1689.
[22] PCPDFWIN, Version 2.2, June 2001, JCPDF Card No. 01-089-5546.
[23] J. Ranløv, K. Nielsen, Crystal structure of the high-temperature protonic con-
ductor SrCeO3, J. Mater. Chem. 4 (6) (1994) 867–868.
[24] M. Keskar, K. Krishnan, N.D. Dahale, Thermal expansion studies on Th(MoO4)2,
Na2Th(MoO4)3 and Na4Th(MoO4)4, J. Alloys Compd. 458 (2008) 104–108.
[25] LATPAR, A least squares program written by V.K. Wadhawan, Neutron Physics
Division, Mumbai, India.
4. Conclusion
The heat capacity and thermal expansion coefficients of
SrCeO3(s) and Sr2CeO4(s) have been measured using DSC and
HTXRD methods. The ˛a, ˛b, ˛a and ˛V SrCeO3(s) have been cal-
culated in the temperature range of 298–1273 K. Both the heat
capacity measurement and the HTXRD results of SrCeO3(s) did not
show any phase transition in the temperature range of 298–1273 K.
However, the plot of coefficient of volume expansion versus tem-
perature of Sr2CeO4(s) shows a change in slope in the temperature
range of 673–773 K. Heat capacity measurements of Sr2CeO4(s) also
confirm the second order phase transition at 750 K.
Heat capacities of Sr2CeO4(s) have been measured in the tem-
perature range of 300–870 K for the first time. Thermodynamic
functions like STo, Cpo, {Ho(T) − Ho(298.15)} Gibbs energy functions
were also calculated for SrCeO3(s) in the temperature range of
298–870 K and that for Sr2CeO4(s) in the temperature range of
298–600 K. The thermodynamic functions generated in this study
along with required literature data will help in establishing the
phase relations in the Sr–Ce–O system.
Acknowledgments
The authors are thankful to Dr. K.L. Ramakumar, Associate Direc-
tor and Dr. V. Venugopal, Director, Radiochemistry and Isotope
Group for their constant encouragement and keen interest in this
work. Authors are also thankful to Dr. S.K. Aggarwal, Head, and Fuel
Chemistry Division for helping in obtaining the results of HTXRD.
[26] I. Riess, M. Ricken, J. Nölting, On the specific heat of nonstoichiometric ceria, J.
Solid State Chem. 57 (1985) 314–322.
[27] I. Barin, Thermochemical Data of Pure Substances, vol. 1, 3rd ed., VCH, Wein-
heim, Federal Republic of Germany, 1995.