High-temperature enthalpy of praseodymium selenides in the homogeneity range bounded by Pr3Se4 and Pr2Se3

被引：0
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作者：
V. F. Litvinenko
A. R. Kopan’
机构：
[1] National Academy of Sciences of Ukraine,Frantsevich Institute for Problems of Materials Science
来源：
Powder Metallurgy and Metal Ceramics | 2009年 / 48卷
关键词：
thermodynamic properties; heat capacity; enthalpy; entropy; Gibbs energy; praseodymium selenides; Pr; Se; Pr; Se; homogeneity range; partial enthalpy;
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摘要：
Calorimetry is used to study the enthalpy of the bounding compositions Pr3Se and Pr2Se3 of the Pr3–xSe4 phase (0 ≤ x ≤ 1/3) at 450–2300 K. The temperature–concentration dependences of the thermodynamic properties of Pr3–xSe4 selenides in the homogeneity range are determined at 298 ≤ T ≤ 2156 K. The Pr3–xSe4 enthalpy function has the following form: H(T, x) − H(298 K, x) = (2817 ⋅ 103T−1 − 75912 + 234.6 ⋅ T − 4.718 ⋅ 10−2T2+ 2.624 ⋅ 10−5 T3) ⋅ e−0.2086x J/mole. An analysis of the partial enthalpies of Pr and Se shows that the chemical bonds between these elements change in simple substances and Pr3–xSe4.
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页码：77 / 82
页数：5
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