High-temperature heat capacities of EuPO4 and SmPO4 synthetic monazites

被引：55

作者：

Popa, K.

Konings, R. J. M.

机构：

[1] Commiss European Communities, Joint Res Ctr, Inst Transuranium Elements, D-76125 Karlsruhe, Germany

[2] Alexandru Ioan Cuza Univ, Dept Inorgan & Analyt Chem, Iasi 700506, Romania

来源：

THERMOCHIMICA ACTA | 2006年 / 445卷 / 01期

关键词：

drop calorimetry; high-temperature heat capacity; enthalpy; lanthanide phosphates;

D O I：

10.1016/j.tca.2006.03.023

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

High-temperature enthalpy increments of monazite-type EUPO4 and SMPO4 were measured by drop calorimetry in the temperature range 450-1570 K and the heat capacity was derived. The excess heat capacity C-exs was calculated by subtracting the lattice heat capacity, interpolated from isostructural LaPO4 (4f(0)) and GdPO4 (4f(7)) compounds. A good agreement was found with C-exs calculated from (estimated) crystal field energies. The heat capacity of PrPO4 was estimated with this approach. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：49 / 52

页数：4

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