Thermodynamic functions of erbium orthophosphate ErPO₄ in the temperature range of 0-1600 K

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• 作者：K.S. Gavrichev^a ; M.A. Ryumin^a ; ^{Ryumin@igic.ras.ru} ; A.V. Tyurin^a ; V.M. Gurevich^b ; A.V. Khoroshilov^a ; L.N. Komissarova^c
• 关键词：Erbium orthophosphate ; Heat capacity ; Thermodynamic functions ; Calorimetry ; Schottky anomaly ; Magnetic phase transition
• 刊名：Thermochimica Acta
• 出版年：2012
• 期刊代码：110_00406031
• 类别：ch
• 出版时间：10 May, 2012
• 卷：535
• 期：Complete
• 页码：1-7
• 文件大小：390 K

摘要

Low temperature heat capacity of erbium phosphate ErPO₄ was measured by relaxation calorimetry (2-35 K) and adiabatic calorimetry (5-345 K). High-temperature enthalpies of this substance were studied by drop calorimetry in the region of 357-1575 K. Smoothed thermodynamic properties (heat capacity, entropy, enthalpy change and derived Gibbs energy) were calculated in the range of 0-1600 K. Gibbs energy of formation of ErPO₄ was estimated using the standard entropy S⁰(298.15 K) from this work: 螖_fG⁰(ErPO₄, 298.15 K) = 鈭?855.3 卤 2.1 kJ mol^鈭?. The Schottky heat capacity anomaly was observed in the range from 2 to 300 K.