Lattice creation and annihilation of LaMnO3+δ caused by nonstoichiometry change

Shogo Miyoshi; Jeong Oh Hong; Keiji Yashiro; Atsushi Kaimai; Yutaka Nigara; Kenichi Kawamura; Tatsuya Kawada; Junichiro Mizusaki

doi:10.1016/S0167-2738(02)00441-1

Lattice creation and annihilation of LaMnO_3+δ caused by nonstoichiometry change

Shogo Miyoshi, Jeong Oh Hong, Keiji Yashiro, Atsushi Kaimai, Yutaka Nigara, Kenichi Kawamura, Tatsuya Kawada, Junichiro Mizusaki

ENV - Environmental Studies for Advanced Society

Research output: Contribution to journal › Article

37 Citations (Scopus)

Abstract

In order to identify the majority ionic defect of La_1-xSr_xMnO_3+δ in the oxygen-excess region, a dilatometry was made on La_0.96MnO_2.94+δ at a fixed temperature (1273 K) by varying the ambient oxygen partial pressure. The specimen of La_0.96MnO_2.94+δ expanded with increasing P_O2 in the region of δ > 0, while the unit cell volume was known to decrease with increasing P_O2. The morphological evolution was also observed on the surface of the La_0.96MnO_2.94+δ specimen after annealing in an oxidizing atmosphere, indicating that the new lattices were created. From these results, it is concluded that the majority ionic defect of the perovskite oxide, La_1-xSr_xMnO_3+δ, is cation vacancies in the oxygen-excess region.

Original language	English
Pages (from-to)	257-263
Number of pages	7
Journal	Solid State Ionics
Volume	154-155
DOIs	https://doi.org/10.1016/S0167-2738(02)00441-1
Publication status	Published - 2002 Dec 2

Keywords

Cation vacancy
Dilatometry
LaMnO
Microstructure evolution
Oxygen-excess nonstoichiometry

ASJC Scopus subject areas

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

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Miyoshi, S., Hong, J. O., Yashiro, K., Kaimai, A., Nigara, Y., Kawamura, K., Kawada, T., & Mizusaki, J. (2002). Lattice creation and annihilation of LaMnO_3+δ caused by nonstoichiometry change. Solid State Ionics, 154-155, 257-263. https://doi.org/10.1016/S0167-2738(02)00441-1

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title = "Lattice creation and annihilation of LaMnO3+δ caused by nonstoichiometry change",

abstract = "In order to identify the majority ionic defect of La1-xSrxMnO3+δ in the oxygen-excess region, a dilatometry was made on La0.96MnO2.94+δ at a fixed temperature (1273 K) by varying the ambient oxygen partial pressure. The specimen of La0.96MnO2.94+δ expanded with increasing PO2 in the region of δ > 0, while the unit cell volume was known to decrease with increasing PO2. The morphological evolution was also observed on the surface of the La0.96MnO2.94+δ specimen after annealing in an oxidizing atmosphere, indicating that the new lattices were created. From these results, it is concluded that the majority ionic defect of the perovskite oxide, La1-xSrxMnO3+δ, is cation vacancies in the oxygen-excess region.",

keywords = "Cation vacancy, Dilatometry, LaMnO, Microstructure evolution, Oxygen-excess nonstoichiometry",

author = "Shogo Miyoshi and Hong, {Jeong Oh} and Keiji Yashiro and Atsushi Kaimai and Yutaka Nigara and Kenichi Kawamura and Tatsuya Kawada and Junichiro Mizusaki",

year = "2002",

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doi = "10.1016/S0167-2738(02)00441-1",

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T1 - Lattice creation and annihilation of LaMnO3+δ caused by nonstoichiometry change

AU - Miyoshi, Shogo

AU - Hong, Jeong Oh

AU - Yashiro, Keiji

AU - Kaimai, Atsushi

AU - Nigara, Yutaka

AU - Kawamura, Kenichi

AU - Kawada, Tatsuya

AU - Mizusaki, Junichiro

PY - 2002/12/2

Y1 - 2002/12/2

N2 - In order to identify the majority ionic defect of La1-xSrxMnO3+δ in the oxygen-excess region, a dilatometry was made on La0.96MnO2.94+δ at a fixed temperature (1273 K) by varying the ambient oxygen partial pressure. The specimen of La0.96MnO2.94+δ expanded with increasing PO2 in the region of δ > 0, while the unit cell volume was known to decrease with increasing PO2. The morphological evolution was also observed on the surface of the La0.96MnO2.94+δ specimen after annealing in an oxidizing atmosphere, indicating that the new lattices were created. From these results, it is concluded that the majority ionic defect of the perovskite oxide, La1-xSrxMnO3+δ, is cation vacancies in the oxygen-excess region.

AB - In order to identify the majority ionic defect of La1-xSrxMnO3+δ in the oxygen-excess region, a dilatometry was made on La0.96MnO2.94+δ at a fixed temperature (1273 K) by varying the ambient oxygen partial pressure. The specimen of La0.96MnO2.94+δ expanded with increasing PO2 in the region of δ > 0, while the unit cell volume was known to decrease with increasing PO2. The morphological evolution was also observed on the surface of the La0.96MnO2.94+δ specimen after annealing in an oxidizing atmosphere, indicating that the new lattices were created. From these results, it is concluded that the majority ionic defect of the perovskite oxide, La1-xSrxMnO3+δ, is cation vacancies in the oxygen-excess region.

KW - Cation vacancy

KW - Dilatometry

KW - LaMnO

KW - Microstructure evolution

KW - Oxygen-excess nonstoichiometry

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JO - Solid State Ionics

JF - Solid State Ionics

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