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

doi:https://doi.org/10.1021/ja964128l

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

Full Record
Other Related Research

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:

Ishihara, Tatsumi; Honda, Miho; Takita, Yusaku ^[1]; Kilner, J A ^[2]

Oita Univ. (Japan)
Imperial College of Science, Technology, and Medicine, London (United Kingdom)

Publication Date:: 1997-03-19

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.

Copy to clipboard


                    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

Copy to clipboard


                    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.

Copy to clipboard


                    
@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}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1021/ja964128l

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Transition metal doped LaGaO{sub 3} perovskite fast oxide ion conductor and intermediate temperature solid oxide fuel cell

Conference Ishihara, Tatsumi ; Shibayama, Takaaki ; Honda, Miho ; ...

Doping transition metal cation is known to enhance the electric conduction of solid electrolytes, however, the ionic conduction can be improved by doping the small amount of transition metal, in particular, doping Co is effective for improving the oxide ion conductivity. In this investigation, oxide ion conductivity of LaGaO{sub 3} based oxide doped with Co were investigated in detail. It was found that LaGaO{sub 3} doped with Co for Ga site (LSGMC) show a notable oxide ion conductivity over a wide range of oxygen partial pressures, although a hole conduction appeared by addition of excess amount of Co. Considering themore »« less
Application of the new oxide ionic conductor, LaGaO{sub 3}, to the solid electrolyte of fuel cells

Book Ishihara, Tatsumi ; Minami, Hiroaki ; Matsuda, Hideaki ; ...

It was found that the perovskite type oxide La{sub 1{minus}x}Sr{sub x}Ga{sub 0.8}Mg{sub 0.2}O{sub 3}, exhibits the high oxide ion conductivity over a wide oxygen partial pressure and temperature range. The electrical power generation characteristics of SOFCs where LaGaO{sub 3}-based perovskite type oxide was applied as the electrolyte, were studied. It became evident that the composition of La{sub 0.9}Sr{sub 0.1}Ga{sub 0.8}Mg{sub 0.2}O{sub 3} was the most suitable for the electrolyte of the SOFC, among the LaGaO{sub 3}-based perovskite oxides, and furthermore, Ni, and La{sub 0.9}Sr{sub 0.1}CoO{sub 3} were suitable as the anode and cathode, respectively. The maximum power density of themore »« less
Intermediate temperature solid oxide fuel cells using a new LaGaO{sub 3} based oxide ion conductor. 1: Doped SmCoO{sub 3} as a new cathode material

Journal Article Ishihara, Tatsumi ; Honda, Miho ; Shibayama, Takaaki ; ... - Journal of the Electrochemical Society

LaGaO{sub 3}-based perovskite oxides doped with Sr and Mg exhibit high ionic conductivity over a wide range of oxygen partial pressure. In this study, the stability of LaGaO{sub 3}-based oxide was investigated. The LaGaO{sub 3}-based oxide was found to be very stable in reducing, oxidizing, and CO{sub 2} atmospheres. Solid oxide fuel cells (SOFCs) using LaGaO{sub 3}-based perovskite-type oxide as the electrolyte were studied for use in intermediate-temperature SOFCs. The power-generation characteristics of cells were strongly affected by the electrodes. Both Ni and LnCoO{sub 3} (Ln:rare earth) were suitable for use as anode and cathode, respectively. Rare-earth cations in themore »« less
https://doi.org/10.1149/1.1838783
Intermediate temperature solid oxide fuel cells using LaGaO{sub 3} electrolyte. II. Improvement of oxide ion conductivity and power density by doping Fe for Ga site of LaGaO{sub 3}

Journal Article Ishihara, Tatsumi ; Shibayama, Takaaki ; Honda, Miho ; ... - Journal of the Electrochemical Society

Effects of small amounts of Fe doping for Ga site in LaGaO{sub 3}-based oxide on oxide ion conductivity is investigated in this study. It is found that doping a small amount of Fe is effective for improving the oxide ion conductivity in La{sub 0.8}Sr{sub 0.2}Ga{sub 0.8}Mg{sub 0.2}O{sub 3} (LSGM). The highest oxide ion conductivity was exhibited at x = 0.03 in La{sub 0.8}Sr{sub 0.2}Ga{sub 0.8}Mg{sub 0.2{minus}x}Fe{sub x}O{sub 3} among the Fe-doped samples. Electron spin resonance (ESR) measurements suggest that Fe is trivalent in LaGaO{sub 3} lattice. The application of the Fe-doped LaGaO{sub 3}-based oxide for the electrolyte of solid oxidemore »« less
https://doi.org/10.1149/1.1393358
Potentiometric oxygen sensor operable in low temperature by applying LaGaO{sub 3}-based oxide for electrolyte

Journal Article Ishihara, Tatsumi ; Higuchi, Masakazu ; Furutani, Haruyoshi ; ... - Journal of the Electrochemical Society

Oxygen sensors are important for combustion control, in particular, for vehicles. A perovskite-type oxide of LaGaO{sub 3} doped with Sr and Mg exhibits a high oxide ion conductivity over a wide range of oxygen partial pressures. In this study, the application of LaGaO{sub 3}-based oxide as the electrolyte of a potentiometric oxygen sensor was investigated. It became clear that silver is the most effective electrode for decreasing the operating temperature. Although a temperature higher than 800 K is required when a conventional Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} electrolyte is used, an operating temperature as low as 600 K is adequatemore »« less
https://doi.org/10.1149/1.1837632

Similar Records