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Title: Oxygen surface exchange and diffusion in the new perovskite oxide ion conductor LaGaO{sub 3}

Abstract

One of the aims of these experiments was to verify that the oxygen ion is the majority carrier in LaGaO{sub 3}-based materials, as they are thought to exhibit p-type conductivity in the high oxygen partial pressure range. Specifically, we have investigated oxygen surface exchange and diffusion in La{sub 0.9}Sr{sub 0.1}Ga{sub 0.8}Mg{sub 0.2}O{sub 3-x} by {sup 18}O isotopic exchange and SIMS at high partial pressures of oxygen (0.1 MPa). In conclusion, these results show that bulk oxygen diffusion in LSGM is very rapid. By a comparison of the oxygen self-diffusivity obtained from tracer and ionic conductivity, the electrical conductivity observed is ionic in the temperature range we have measured. The surface exchange coefficients are anomalous when compared to other perovskite oxides. The activation enthalpy for surface exchange is higher than that for self diffusion coefficient, a finding observed for two other solid oxide electrolytes with the fluorite structure. This behavior is thought to originate in the low electron concentrations found in these electrolyte materials, particularly at the lowest temperatures. 13 refs., 2 figs.

Authors:
; ;  [1];  [2]
  1. Oita Univ. (Japan)
  2. Imperial College of Science, Technology, and Medicine, London (United Kingdom)
Publication Date:
OSTI Identifier:
484484
Resource Type:
Journal Article
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 119; Journal Issue: 11; Other Information: PBD: 19 Mar 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 40 CHEMISTRY; LANTHANUM COMPOUNDS; IONIC CONDUCTIVITY; OXYGEN; DIFFUSION; PEROVSKITES; OXIDES; SURFACE PROPERTIES

Citation Formats

Ishihara, Tatsumi, Honda, Miho, Takita, Yusaku, and Kilner, J A. Oxygen surface exchange and diffusion in the new perovskite oxide ion conductor LaGaO{sub 3}. United States: N. p., 1997. Web. doi:10.1021/ja964128l.
Ishihara, Tatsumi, Honda, Miho, Takita, Yusaku, & Kilner, J A. Oxygen surface exchange and diffusion in the new perovskite oxide ion conductor LaGaO{sub 3}. United States. https://doi.org/10.1021/ja964128l
Ishihara, Tatsumi, Honda, Miho, Takita, Yusaku, and Kilner, J A. Wed . "Oxygen surface exchange and diffusion in the new perovskite oxide ion conductor LaGaO{sub 3}". United States. https://doi.org/10.1021/ja964128l.
@article{osti_484484,
title = {Oxygen surface exchange and diffusion in the new perovskite oxide ion conductor LaGaO{sub 3}},
author = {Ishihara, Tatsumi and Honda, Miho and Takita, Yusaku and Kilner, J A},
abstractNote = {One of the aims of these experiments was to verify that the oxygen ion is the majority carrier in LaGaO{sub 3}-based materials, as they are thought to exhibit p-type conductivity in the high oxygen partial pressure range. Specifically, we have investigated oxygen surface exchange and diffusion in La{sub 0.9}Sr{sub 0.1}Ga{sub 0.8}Mg{sub 0.2}O{sub 3-x} by {sup 18}O isotopic exchange and SIMS at high partial pressures of oxygen (0.1 MPa). In conclusion, these results show that bulk oxygen diffusion in LSGM is very rapid. By a comparison of the oxygen self-diffusivity obtained from tracer and ionic conductivity, the electrical conductivity observed is ionic in the temperature range we have measured. The surface exchange coefficients are anomalous when compared to other perovskite oxides. The activation enthalpy for surface exchange is higher than that for self diffusion coefficient, a finding observed for two other solid oxide electrolytes with the fluorite structure. This behavior is thought to originate in the low electron concentrations found in these electrolyte materials, particularly at the lowest temperatures. 13 refs., 2 figs.},
doi = {10.1021/ja964128l},
url = {https://www.osti.gov/biblio/484484}, journal = {Journal of the American Chemical Society},
number = 11,
volume = 119,
place = {United States},
year = {1997},
month = {3}
}