Y2Ti2O7 和 Eu2Ti2O7 在 7-1800 K 温度范围内的热力学性质

IF 0.7 4区化学 Q4 CHEMISTRY, PHYSICAL Russian Journal of Physical Chemistry A Pub Date : 2024-09-09 DOI:10.1134/S0036024424700973

P. G. Gagarin, A. V. Gus’kov, A. V. Khoroshilov, V. N. Gus’kov, O. N. Kondrat’eva, M. A. Ryumin, G. E. Nikiforova, K. S. Gavrichev

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摘要

摘要研究了具有热绿球结构的 Y2Ti2O7 和 Eu2Ti2O7 在 7-1800 K 温度范围内热容量的温度依赖性。证实了钛酸铕的热容量在 10-60 K 范围内存在较小的浅层异常。对热力学性质（熵、焓变和还原吉布斯能）进行了计算。根据氧化物形成钛酸盐的吉布斯能计算结果得出结论，这两种钛酸盐在高温区热力学上是稳定的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Thermodynamic Properties of Y2Ti2O7 and Eu2Ti2O7 in the Temperature Range 7–1800 K

The temperature dependence of the heat capacity of Y₂Ti₂O₇ and Eu₂Ti₂O₇ with a pyrochlore structure in the temperature range of 7–1800 K has been studied. The existence of a small shallow anomaly of the heat capacity of europium titanate in the range of 10–60 K was confirmed. The thermodynamic properties (entropy, enthalpy change, and reduced Gibbs energy) were calculated. Based on the results of calculation of the Gibbs energy of formation of the titanates from oxides it was concluded that both titanates are thermodynamically stable in the high temperature region.

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来源期刊

Russian Journal of Physical Chemistry A 化学-物理化学

CiteScore

1.20

自引率

14.30%

发文量

376

审稿时长

5.1 months

期刊介绍： Russian Journal of Physical Chemistry A. Focus on Chemistry (Zhurnal Fizicheskoi Khimii), founded in 1930, offers a comprehensive review of theoretical and experimental research from the Russian Academy of Sciences, leading research and academic centers from Russia and from all over the world. Articles are devoted to chemical thermodynamics and thermochemistry, biophysical chemistry, photochemistry and magnetochemistry, materials structure, quantum chemistry, physical chemistry of nanomaterials and solutions, surface phenomena and adsorption, and methods and techniques of physicochemical studies.