Oxygen surface exchange and diffusion in LaGaO3 based perovskite type oxides

Tatsumi Ishihara, John A. Kilner, Miho Honda, Natsuko Sakai, Harumi Yokokawa, Yusaku Takita

Research output: Contribution to journalArticle

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Abstract

Isotopic exchange was used to determine the oxygen tracer diffusion coefficient and surface exchange coefficient of LaGaO3 based perovskites at a temperature from 923 to 1173 K. The oxygen diffusion coefficient was found to be higher than the surface exchange coefficient. In addition, the change in activation energy of the surface exchange coefficient was also observed at 973 K. The results indicate that the oxygen exchange behavior of acceptor doped LaGaO3 is similar to that of other oxygen ion conductors such as ZrO2-Y2O3 and CeO2-Gd2O3, rather than that was found for the isostructural, but mainly mixed conducting, perovskite oxides. It was noted that the diffusion coefficient was not influenced while the surface exchange coefficient was strongly affected by the oxygen partial pressure of isotopic exchange and the empirical relation was found to be a power of 0.45. Oxygen tracer diffusion data obtained by SIMS was compared to that obtained by the measurement of the electrical conductivity with the Nernst-Einstein relationship. For the temperatures at which the measurements were taken, the two were almost identical within the accuracy of SIMS, strongly indicating that the conductivity in LSGM is ionic. The high oxide ion conductivity in LSGM results from the high mobility of oxygen vacancies in addition to the high concentration of oxygen vacancies.

Original languageEnglish
Pages (from-to)593-600
Number of pages8
JournalSolid State Ionics
Volume113-115
Publication statusPublished - Dec 1 1998

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Perovskite
Oxides
Oxygen
oxides
oxygen
Oxygen vacancies
Secondary ion mass spectrometry
diffusion coefficient
coefficients
secondary ion mass spectrometry
tracers
Ions
conductivity
Partial pressure
perovskites
oxygen ions
perovskite
Activation energy
partial pressure
conductors

All Science Journal Classification (ASJC) codes

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

Cite this

Ishihara, T., Kilner, J. A., Honda, M., Sakai, N., Yokokawa, H., & Takita, Y. (1998). Oxygen surface exchange and diffusion in LaGaO3 based perovskite type oxides. Solid State Ionics, 113-115, 593-600.

Oxygen surface exchange and diffusion in LaGaO3 based perovskite type oxides. / Ishihara, Tatsumi; Kilner, John A.; Honda, Miho; Sakai, Natsuko; Yokokawa, Harumi; Takita, Yusaku.

In: Solid State Ionics, Vol. 113-115, 01.12.1998, p. 593-600.

Research output: Contribution to journalArticle

Ishihara, T, Kilner, JA, Honda, M, Sakai, N, Yokokawa, H & Takita, Y 1998, 'Oxygen surface exchange and diffusion in LaGaO3 based perovskite type oxides', Solid State Ionics, vol. 113-115, pp. 593-600.
Ishihara T, Kilner JA, Honda M, Sakai N, Yokokawa H, Takita Y. Oxygen surface exchange and diffusion in LaGaO3 based perovskite type oxides. Solid State Ionics. 1998 Dec 1;113-115:593-600.
Ishihara, Tatsumi ; Kilner, John A. ; Honda, Miho ; Sakai, Natsuko ; Yokokawa, Harumi ; Takita, Yusaku. / Oxygen surface exchange and diffusion in LaGaO3 based perovskite type oxides. In: Solid State Ionics. 1998 ; Vol. 113-115. pp. 593-600.
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