Oxygen nonstoichiometry of B-site doped LaCrO3

Masatsugu Oishi; Keiji Yashiro; Jeong Oh Hong; Yutaka Nigara; Tatsuya Kawada; Junichiro Mizusaki

doi:10.1016/j.ssi.2006.12.018

Oxygen nonstoichiometry of B-site doped LaCrO₃

Masatsugu Oishi, Keiji Yashiro, Jeong Oh Hong, Yutaka Nigara, Tatsuya Kawada, Junichiro Mizusaki

ENV - Environmental Studies for Advanced Society

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

44 Citations (Scopus)

Abstract

Recently, B-site doping in the perovskite-type oxides has often been carried out to control various properties. One of the perovskite-type oxides, doped LaCrO₃, is the candidate for the interconnector for Solid Oxide Fuel Cells (SOFC). For its stability under reducing atmospheres, B-site doped LaCrO₃ is also one of the candidates for the anode of SOFC. The oxygen nonstoichiometry, δ, in B-site doped LaCrO_3-δ was measured as a function of oxygen partial pressure at 973 K to 1373 K. The observed values of δ were different by the different B-site dopants, and also different from those of A-site doped LaCrO₃. It was shown that only 10 mol% of dopant in B-site drastically affects the redox property of LaCrO₃. Defect model for B-site controlled LaCrO₃ was interpreted by assuming the reaction, 2Cr_Cr^X + V_O^•• + 1/2O₂(g)⇔2Cr_Cr^• + O_O^X.

Original language	English
Pages (from-to)	307-312
Number of pages	6
Journal	Solid State Ionics
Volume	178
Issue number	3-4
DOIs	https://doi.org/10.1016/j.ssi.2006.12.018
Publication status	Published - 2007 Feb 1

Keywords

B-site doping
LaCrO
Oxygen nonstoichiometry
Perovskite-type oxides
SOFC

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/j.ssi.2006.12.018

Cite this

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title = "Oxygen nonstoichiometry of B-site doped LaCrO3",

abstract = "Recently, B-site doping in the perovskite-type oxides has often been carried out to control various properties. One of the perovskite-type oxides, doped LaCrO3, is the candidate for the interconnector for Solid Oxide Fuel Cells (SOFC). For its stability under reducing atmospheres, B-site doped LaCrO3 is also one of the candidates for the anode of SOFC. The oxygen nonstoichiometry, δ, in B-site doped LaCrO3-δ was measured as a function of oxygen partial pressure at 973 K to 1373 K. The observed values of δ were different by the different B-site dopants, and also different from those of A-site doped LaCrO3. It was shown that only 10 mol% of dopant in B-site drastically affects the redox property of LaCrO3. Defect model for B-site controlled LaCrO3 was interpreted by assuming the reaction, 2CrCrX + VO•• + 1/2O2(g)⇔2CrCr• + OOX.",

keywords = "B-site doping, LaCrO, Oxygen nonstoichiometry, Perovskite-type oxides, SOFC",

author = "Masatsugu Oishi and Keiji Yashiro and Hong, {Jeong Oh} and Yutaka Nigara and Tatsuya Kawada and Junichiro Mizusaki",

year = "2007",

month = feb,

day = "1",

doi = "10.1016/j.ssi.2006.12.018",

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T1 - Oxygen nonstoichiometry of B-site doped LaCrO3

AU - Oishi, Masatsugu

AU - Yashiro, Keiji

AU - Hong, Jeong Oh

AU - Nigara, Yutaka

AU - Kawada, Tatsuya

AU - Mizusaki, Junichiro

PY - 2007/2/1

Y1 - 2007/2/1

N2 - Recently, B-site doping in the perovskite-type oxides has often been carried out to control various properties. One of the perovskite-type oxides, doped LaCrO3, is the candidate for the interconnector for Solid Oxide Fuel Cells (SOFC). For its stability under reducing atmospheres, B-site doped LaCrO3 is also one of the candidates for the anode of SOFC. The oxygen nonstoichiometry, δ, in B-site doped LaCrO3-δ was measured as a function of oxygen partial pressure at 973 K to 1373 K. The observed values of δ were different by the different B-site dopants, and also different from those of A-site doped LaCrO3. It was shown that only 10 mol% of dopant in B-site drastically affects the redox property of LaCrO3. Defect model for B-site controlled LaCrO3 was interpreted by assuming the reaction, 2CrCrX + VO•• + 1/2O2(g)⇔2CrCr• + OOX.

AB - Recently, B-site doping in the perovskite-type oxides has often been carried out to control various properties. One of the perovskite-type oxides, doped LaCrO3, is the candidate for the interconnector for Solid Oxide Fuel Cells (SOFC). For its stability under reducing atmospheres, B-site doped LaCrO3 is also one of the candidates for the anode of SOFC. The oxygen nonstoichiometry, δ, in B-site doped LaCrO3-δ was measured as a function of oxygen partial pressure at 973 K to 1373 K. The observed values of δ were different by the different B-site dopants, and also different from those of A-site doped LaCrO3. It was shown that only 10 mol% of dopant in B-site drastically affects the redox property of LaCrO3. Defect model for B-site controlled LaCrO3 was interpreted by assuming the reaction, 2CrCrX + VO•• + 1/2O2(g)⇔2CrCr• + OOX.

KW - B-site doping

KW - LaCrO

KW - Oxygen nonstoichiometry

KW - Perovskite-type oxides

KW - SOFC

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