Energetics of bulk lutetium-doped Ce1−xLuxO2−x/2 compounds

Nimrod Yavo; Geetu Sharma; Giora Kimmel; Igor Lubomirsky; Alexandra Navrotsky; Ori Yeheskel

doi:10.1111/jace.15489

Energetics of bulk lutetium-doped Ce_1−xLu_xO_2−x/2 compounds

Nimrod Yavo, Geetu Sharma, Giora Kimmel, Igor Lubomirsky, Alexandra Navrotsky, Ori Yeheskel

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The dissolution enthalpy, ΔH_DS, and the formation enthalpy, ΔH_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−XLu_XO_2−X/2, studied 0 ≤ X ≤ 0.3, the ΔH_DS decreases linearly and smoothly with lutetium content according to ΔH_DS, kJ/mol = 73.5(1.0)−165.1(5.5)·x). The enthalpy of formation, ΔH_f,ox, becomes more exothermic linearly with lutetium content. No anomaly in ΔH_f,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.

Original language	English
Pages (from-to)	3520-3526
Number of pages	7
Journal	Journal of the American Ceramic Society
Volume	101
Issue number	8
DOIs	https://doi.org/10.1111/jace.15489
State	Published - Aug 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 The American Ceramic Society

Funding

The work at the WIS was supported by PAZY foundation grant 252/14. The calorimetric studies at UC Davis were supported by the U.S. Department of Energy, Office of Science, Grant DE-FG02-03ER46053. The authors I.L., N.Y., and O.Y acknowledge the fruitful discussions with Dr. D. Ehre from the Weizmann Institute of Science on clustering in REDC.

Funders	Funder number
U.S. Department of Energy
Office of Science	DE-FG02-03ER46053

Keywords

cerium/cerium compounds
dopants/doping
oxides
thermodynamics

Access to Document

10.1111/jace.15489

Cite this

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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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AU - Sharma, Geetu

AU - Kimmel, Giora

AU - Lubomirsky, Igor

AU - Navrotsky, Alexandra

AU - Yeheskel, Ori

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