High-temperature calorimetry of (La1−xLnx)PO4 solid solutions |
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| Institution: | 1. European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, 76125 Karlsruhe, Germany;2. University of Münster, Institute for Mineralogy, Corrensstrasse 24, D-48149 Münster, Germany |
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| Abstract: | 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 Ln3+. For (La0.5Gd)0.5PO4 also the temperature dependence has been determined for T = (515 to 1565) K, indicating that the excess enthalpy decreases with increasing temperature. |
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