Energetics of bulk lutetium‐doped Ce1−xLuxO2−x/2 compounds |
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| Authors: | Nimrod Yavo Geetu Sharma Giora Kimmel Igor Lubomirsky Alexandra Navrotsky Ori Yeheskel |
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| Affiliation: | 1. Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, Israel;2. Peter A. Rock Thermochemistry Laboratory, NEAT‐ORU, University of California Davis, Davis, California;3. Applied Research Center, Ben Gurion University of the Negev, Beer Sheva, Israel;4. Department of Materials, Nuclear Research Center, Beer Sheva, Israel |
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| Abstract: | The dissolution enthalpy, ΔHDS, and the formation enthalpy, ΔHf,ox, of bulk lutetium‐doped cerium oxide (LuDC) were studied at 701°C in molten sodium molybdate. For the composition range of Ce1?XLuXO2?X/2, studied 0 ≤ X ≤ 0.3, the ΔHDS decreases linearly and smoothly with lutetium content according to ΔHDS, kJ/mol = 73.5(1.0)?165.1(5.5)·x). The enthalpy of formation, ΔHf,ox, becomes more exothermic linearly with lutetium content. No anomaly in ΔHf,ox is observed at low Lu2O3 concentration as reported previously for several other rare‐earth‐doped ceria systems, suggesting possible differences in clustering and microstructure, which may also be related to difference in processing conditions. |
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| Keywords: | cerium/cerium compounds dopants/doping oxides thermodynamics |
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