Russian Journal of Inorganic Chemistry

, Volume 64, Issue 7, pp 886–889 | Cite as

Synthesis and Thermodynamic Properties of Germanate Tb2Ge2O7

  • L. T. DenisovaEmail author
  • Yu. F. Kargin
  • L. A. Irtyugo
  • N. V. Belousova
  • V. V. Beletskii
  • V. M. Denisov


Germanate Tb2Ge2O7 has been prepared by solid-phase synthesis from a stoichiometric mixture of Tb2O3 and GeO2 by sequential firing in air at temperatures of 1273–1473 K. The effect of temperature on its molar heat capacity has been studied by differential scanning calorimetry. According to the obtained dependence Cp = f(T), the thermodynamic properties (enthalpy and entropy changes and the reduced Gibbs energy) have been calculated, and the specific heat value at 298 K has been estimated.


terbium germanate differential scanning calorimetry heat capacity enthalpy and entropy changes reduced Gibbs energy 



The work was performed within the framework of the State Assignment of the Ministry of Science and Higher Education of the Russian Federation to the Siberian Federal University for 2017–2019 (project 4.8083.2017/8.9 “Formation of a Database of Thermodynamic Characteristics of Complex Oxide Multifunctional Materials Containing Rare and Disseminated Elements”).


  1. 1.
    L. A. Dem’yanets, A. N. Lobachev, and G. A. Emel’chenko, Rare-Earth Element Germanates (Nauka, Moscow, 1980) [in Russian].Google Scholar
  2. 2.
    K. I. Portnoi and N. I. Timofeeva, Oxygen Compounds of Rare-Earth Elements (Metallurgiya, Moscow, 1986) [in Russian].Google Scholar
  3. 3.
    U. W. Becker and J. Felsche, J. Less-Common Met. 128, 269 (1987).CrossRefGoogle Scholar
  4. 4.
    I. A. Bondar’, N. V. Vinogradova, L. I. Dem’yanets, et al., Chemistry of Rare Elements: Rare-Earth Compounds: Silicates, Germanates, Phosphates, Arsenates, and Vanadates (Nauka, Moscow, 1983) [in Russian].Google Scholar
  5. 5.
    M. A. Subramanian and A. W. Sleight, Handbook Phys. Chem. Rare Earths 16, 225 (1993).CrossRefGoogle Scholar
  6. 6.
    X. Li, Y. Q. Cai, Q. Cui, et al., Phys. Rev. B 94, 214 429 (2016).
  7. 7.
    K. Stadnicka, A. M. Glazer, M. Korelewski, et al., J. Phys.: Condens. Matter 2, 4795 (1990).Google Scholar
  8. 8.
    E. Morosan, J. A. Fleitmann, Q. Huang, et al., Phys. Rev. B 77, 224423 (2008).
  9. 9.
    X. Ke, M. L. Dahlberg, E. Morosan, et al., Phys. Rev. B 78, 10441 (2008).
  10. 10.
    Y. M. Jana, M. Ghosh, D. Ghosh, et al., J. Magn. Magn. Mater. 210, 93 (2000).CrossRefGoogle Scholar
  11. 11.
    L. T. Denisova, Yu. F. Kargin, L. G. Chumilina, and V. M. Denisov, Russ. J. Inorg. Chem. 61, 420 (2016).
  12. 12.
    V. M. Denisov, L. T. Denisova, L. A. Irtyugo, and V. S. Biront, Phys. Solid State 52, 1362 (2010).
  13. 13.
    L. T. Denisova, Yu. F. Kargin, L. G. Chumilina, et al., Russ. J. Inorg. Chem. 60, 137 (2015).
  14. 14.
    L. T. Denisova, L. A. Irtyugo, and Yu. F. Kargin, Inorg. Mater. 54, 361 (2018).
  15. 15.
    R. D. Shannon, Acta Crystallogr., Sect. A 32, 751 (1976).CrossRefGoogle Scholar
  16. 16.
    S. M. Skuratov, V. P. Kolesov, and A. F. Vorob’ev, Thermochemistry (Izd–vo Mosk. Univ., Moscow, 1966), Pt. II [in Russian].Google Scholar
  17. 17.
    V. I. Pet’kov, A. V. Markin, and N. N. Smirnova, Russ. J. Phys. Chem. A 87, 1266 (2013).
  18. 18.
    N. N. Sirota, A. V. Novikov, V. V. Novikova, et al., Zh. Fiz. Khim. 64, 1750 (1990).Google Scholar
  19. 19.
    J. Leitner, P. Chuchvalec, D. Sedmidybsky, et al., Thermochim. Acta 295, 27 (2003).Google Scholar
  20. 20.
    G. K. Moiseev, N. A. Vatolin, L. A. Marshuk, et al., Temperature-Dependent Reduced Gibbs Energies for Selected Inorganic Compounds. Alternative Database ASTRA.OWN (UrO RAN, Yekaterinburg, 1997) [in Russian].Google Scholar
  21. 21.
    L. T. Denisova, L. A. Irtyugo, Yu. F. Kargin, et al., Inorg. Mater. 53, 289 (2017).
  22. 22.
    L. T. Denisova, A. D. Izotov, L. G. Chumilina, et al., Doklady Phys. Chem. 467, 41 (2016).
  23. 23.
    S. P. Gordienko, B. V. Fenochka, and G. Sh. Viksman, Thermodynamics of Lanthanide Compounds. Handbook (Naukova Dumka, Kiev, 1979) [in Russian].Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • L. T. Denisova
    • 1
    Email author
  • Yu. F. Kargin
    • 2
  • L. A. Irtyugo
    • 1
  • N. V. Belousova
    • 1
  • V. V. Beletskii
    • 1
  • V. M. Denisov
    • 1
  1. 1.Institute of Non-Ferrous Metals and Materials Science, Siberian Federal UniversityKrasnoyarskRussia
  2. 2.Baikov Institute of Metallurgy and Materials Science, Russian Academy of SciencesMoscowRussia

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