Journal
JOURNAL OF CHEMICAL THERMODYNAMICS
Volume 38, Issue 7, Pages 825-829Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2005.08.019
Keywords
heat capacity; enthalpy; drop calorimetry; high temperature; lanthanide phosphates
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The high-temperature heat capacity of three lanthanide orthophosphates of monazite structure have been measured in the temperature range (450 to 1570) K. The data have been analysed in terms of a lattice term, represented by the 4f(0) and 4f(7) compounds LaPO4 and GdPO4, and an electronic term for CePO4. The calculated excess heat capacity thus obtained is in reasonable agreement with that calculated from the crystal field energies. (C) 2005 Elsevier Ltd. All rights reserved.
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