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 (US)
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

Keywords

cerium/cerium compounds
dopants/doping
oxides
thermodynamics

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1111/jace.15489

Cite this

@article{10c21eced00d494db1cf3d15f84f010a,

title = "Energetics of bulk lutetium-doped Ce1−xLuxO2−x/2 compounds",

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.",

keywords = "cerium/cerium compounds, dopants/doping, oxides, thermodynamics",

author = "Nimrod Yavo and Geetu Sharma and Giora Kimmel and Igor Lubomirsky and Alexandra Navrotsky and Ori Yeheskel",

note = "Funding Information: 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. Publisher Copyright: {\textcopyright} 2018 The American Ceramic Society",

year = "2018",

month = aug,

doi = "10.1111/jace.15489",

language = "English (US)",

volume = "101",

pages = "3520--3526",

journal = "Journal of the American Ceramic Society",

issn = "0002-7820",

publisher = "Wiley-Blackwell",

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AU - Yavo, Nimrod

AU - Sharma, Geetu

AU - Kimmel, Giora

AU - Lubomirsky, Igor

AU - Navrotsky, Alexandra

AU - Yeheskel, Ori

N1 - Funding Information: 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. Publisher Copyright: © 2018 The American Ceramic Society

PY - 2018/8

Y1 - 2018/8

N2 - 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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