The high-temperature heat capacity of LnPO4 (Ln = La,Ce, Gd) by drop calorimetry |
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| Institution: | 1. European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany;2. Department of Inorganic Chemistry, Institute of Chemical Technology, Technická 5, 166 28 Prague, Czech Republic;1. College of Electronic, Communication and Physics, Shandong University of Science and Technology, Qingdao, 266590, China;2. Key Laboratory of Transparent and Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, China;3. Institute of Physics, Polish Academy of Science, Al. Lotników 32/46, 02-668, Warsaw, Poland;1. Aalto University School of Chemical Technology, Department of Materials Science and Engineering, Metallurgical Thermodynamics and Modelling Research Group, Vuorimiehentie 2K, PO Box 16200, FI-00076 Aalto, Finland;2. Department of Process Engineering, University of Stellenbosch, Private Bag X1, Matieland, 7602 Stellenbosch, South Africa;1. Institute of Silicate Materials, Riga Technical University, Azenes 14/24, Riga LV-1048, Latvia;2. Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark;3. Riga Biomaterials Innovation and Development Centre, Riga Technical University, Riga, Latvia;1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Heilongjiang, Harbin, 150080, China;2. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China;3. Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials and Processing Technology, Beijing, 100076, China |
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| Abstract: | 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 4f0 and 4f7 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. |
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