High-temperature calorimetry of (La1-xLnx)PO4 solid solutions

被引：41
作者：
Popa, K.
Konings, R. J. M.
Geisler, T.
机构：
[1] European Commiss, Joint Res Ctr, Inst Transuranium Elements, D-76125 Karlsruhe, Germany
[2] Univ Munster, Inst Mineral, D-48149 Munster, Germany
来源：
JOURNAL OF CHEMICAL THERMODYNAMICS | 2007年 / 39卷 / 02期
关键词：
monazite; lanthanide phosphates; solid solutions; mixing properties; calorimetry;
D O I：
10.1016/j.jct.2006.07.010
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The enthalpy increment of the monazite-type solid solutions of LaPO4 with NdPO4, EuPO4 and GdPO4 has been measured by drop calorimetry at T = 1000 K. The results show deviations (excess enthalpy) from ideal behaviour that have been interpreted in terms of lattice strains resulting from the ion size effects of substitution of La3+ by Ln(3+). For (La0.5Gd)(0.5)PO4 also the temperature dependence has been determined for T= (515 to 1565) K, indicating that the excess enthalpy decreases with increasing temperature. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：236 / 239
页数：4
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