Energetics of bulk lutetium‐doped Ce _1−x Lu _x O _2−x/2 compounds

Journal Article · Mon Feb 26 00:00:00 EST 2018 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.15489· OSTI ID:1422636

Yavo, Nimrod ^[1]; Sharma, Geetu ^[2]; Kimmel, Giora ^[3]; Lubomirsky, Igor  ^[1]; Navrotsky, Alexandra  ^[2]; Yeheskel, Ori  ^[4]

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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. Peter A. Rock Thermochemistry Laboratory NEAT‐ORU University of California Davis Davis California, Department of Materials Nuclear Research Center Beer Sheva Israel

Abstract The dissolution enthalpy , Δ H _DS , and the formation enthalpy, Δ H _f,ox , of bulk lutetium‐doped cerium oxide (LuDC) were studied at 701°C in molten sodium molybdate. For the composition range of Ce _{1− X} Lu _X O _{2− X /2} , studied 0 ≤  X  ≤   0.3, the Δ H _DS decreases linearly and smoothly with lutetium content according to Δ H _DS , kJ/mol = 73.5(1.0)−165.1(5.5)· x ). The enthalpy of formation, Δ H _f,ox , becomes more exothermic linearly with lutetium content. No anomaly in Δ H _f,ox is observed at low Lu ₂ O ₃ 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.

• Sponsoring Organization: USDOE
• OSTI ID: 1422636
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Vol. 101 Journal Issue: 8; ISSN 0002-7820
• Publisher: Wiley-Blackwell
• Country of Publication: United States
• Language: English