钛酸钇的热力学性质

IF 0.7 4区化学 Q4 CHEMISTRY, PHYSICAL Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI:10.1134/S0036024424702467

A. V. Guskov, P. G. Gagarin, V. N. Guskov, K. S. Gavrichev

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引用次数: 0

摘要

在2 ~ 1869 K的温度范围内，通过XRD、SEM和EDX对合成的单相焦绿钛酸钇的等压热容进行了首次测量。证实了Yb2Ti2O7在20k时发生了磁转变，而整个Yb2Ti2O7区域没有发生结构转变。计算了298.15 K下由元素和二元氧化物生成Yb2Ti2O7的热力学函数（熵、焓增量和吉布斯自由能），并评价了Schottky异常对热容的贡献。

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Thermodynamic Properties of Ytterbium Titanate

The first measurements are made of the isobaric heat capacity of single-phase pyrochlore ytterbium titanate synthesized and studied via XRD, SEM, and EDX in the 2–1869 K range of temperatures. A magnetic transformation at <20 K and a lack of structural transformations throughout the region of Yb₂Ti₂O₇ are confirmed. Thermodynamic functions (entropy, the increment of enthalpy, and the Gibbs free energy of the formation of Yb₂Ti₂O₇ from elements and binary oxides at 298.15 K) are calculated, and the contribution to the heat capacity of the Schottky anomaly is evaluated.

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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.