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

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

doi:https://doi.org/10.1111/jace.15489

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

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

Department of Molecular Chemistry and Materials Science Perlman

Weizmann Institute of Science

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

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 Lu ₂O 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.

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

Keywords

cerium/cerium compounds
dopants/doping
oxides
thermodynamics

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Geology
Geochemistry and Petrology
Materials Chemistry

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@article{44826609310840dd9581fd0ee4a62287,

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

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 Lu 2O 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. ",

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 = "Publisher Copyright: {\textcopyright} 2018 The American Ceramic Society",

year = "2018",

month = aug,

doi = "https://doi.org/10.1111/jace.15489",

language = "الإنجليزيّة",

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T1 - Energetics of bulk lutetium-doped Ce1-xLuxO2-x/2 compounds

AU - Yavo, Nimrod

AU - Sharma, Geetu

AU - Kimmel, Giora

AU - Lubomirsky, Igor

AU - Navrotsky, Alexandra

AU - Yeheskel, Ori

PY - 2018/8

Y1 - 2018/8

N2 - 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 Lu 2O 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.

AB - 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 Lu 2O 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.

KW - cerium/cerium compounds

KW - dopants/doping

KW - oxides

KW - thermodynamics

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U2 - https://doi.org/10.1111/jace.15489

DO - https://doi.org/10.1111/jace.15489

M3 - مقالة

SN - 0002-7820

VL - 101

SP - 3520

EP - 3526

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

IS - 8

ER -

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

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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