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Thermodynamic properties of lanthanum, neodymium, gadolinium hafnates (Ln2Hf2O7): Calorimetric and KEMS studies

Published online by Cambridge University Press:  16 July 2019

Viktor A. Vorozhtcov ,
Valentina L. Stolyarova Open the ORCID record for Valentina L. Stolyarova [Opens in a new window] ,
Mikhail V. Chislov ,
Irina A. Zvereva ,
Elizaveta P. Simonenko  and
Nikolay P. Simonenko
Viktor A. Vorozhtcov
Affiliation:
Institute of Chemistry, Saint Petersburg State University, Saint Petersburg 199034, Russia
Valentina L. Stolyarova*
Affiliation:
Institute of Chemistry, Saint Petersburg State University, Saint Petersburg 199034, Russia
Mikhail V. Chislov
Affiliation:
Institute of Chemistry, Saint Petersburg State University, Saint Petersburg 199034, Russia
Irina A. Zvereva
Affiliation:
Institute of Chemistry, Saint Petersburg State University, Saint Petersburg 199034, Russia
Elizaveta P. Simonenko
Affiliation:
Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Moscow 119991, Russia
Nikolay P. Simonenko
Affiliation:
Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Moscow 119991, Russia
*
a)Address all correspondence to this author. e-mail: v.stolyarova@spbu.ru
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Abstract

Using the data obtained by Knudsen effusion mass spectrometry, the standard formation thermodynamic properties of La2Hf2O7, Nd2Hf2O7, and Gd2Hf2O7 were calculated in the present study at high temperatures. Based on the results obtained, it was shown that the standard formation Gibbs energies of La2Hf2O7, Nd2Hf2O7, and Gd2Hf2O7 from the elements at the temperature 2445 K were consistent with the empirical rule concerning decrease of stability of pyrochlore hafnate phase with decrease in lanthanoid ionic radius. The La2Hf2O7 and Gd2Hf2O7 heat capacities were obtained in the present study by differential scanning calorimetry. These data were used along with those found earlier to evaluate the standard formation Gibbs energies of La2Hf2O7 and Gd2Hf2O7 from the elements at the temperature 298 K, which equal (−3937 ± 10) kJ/mol and (−3895 ± 10) kJ/mol, respectively. The thermodynamic properties of La2Hf2O7, Nd2Hf2O7, and Gd2Hf2O7 estimated in a wide temperature range allowed consideration of reliability of data available in the literature.

Keywords

ceramiccalorimetrymass spectroscopy
Type
Invited Paper
Information
Journal of Materials Research , Volume 34 , Issue 19: Focus Issue: Thermodynamics of Complex Solids , 14 October 2019 , pp. 3326 - 3336
Copyright
Copyright © Materials Research Society 2019 

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