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|Title:||A Re-evaluation of the Heat Capacity of Cerium Zirconate (Ce2Zr2O7)|
|Authors:||POPA Karin; KONINGS RUDY; WASTIN FRANCK; COLINEAU ERIC; MAGNANI Nicola; RAISON PHILIPPE|
|Citation:||JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS no. 69 p. 70-75|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|Type:||Articles in periodicals and books|
|Abstract:||The heat capacity of cerium zirconate pyrochlore, Ce2Zr2O7, was measured from 0.4 to 305K by hybrid adiabatic relaxation method for various magnetic field strengths. Magnetisation measurements were performed on the sample also. The results revealed a lowtemperature anomaly that showed Schottky-type characteristics with increasing magnetic field strength. The estimated entropy due to the magnetic ordering of the two Ce3+ moments is 1.37R, close to the theoretical value for a doublet ground state (1.39R). The enthalpy increments relative to 298.15K were measured by drop calorimetry from 531 to 1556 K. The obtained results significantly differ from those reported in the literature; the origin of the discrepancy is due to the probable oxidation of the pyrochlore structure into fluorite.|
|JRC Directorate:||Nuclear Safety and Security|
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