Oxide ion conductivity in doubly doped PrGaO3 perovskite-type oxide

Tatsumi Ishihara, Haruyoshi Furutani, Hiroshi Arikawa, Miho Honda, Taner Akbay, Yusaku Takita

Research output: Contribution to journalArticle

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Abstract

In this study, oxide ion conduction characteristics of doubly doped PrGaO3 were investigated. It is found that PrGaO3 doped with Sr (or Ca) for the Pr site and Mg for the Ga site exhibits the high oxide ion conduction which was slightly less than that measured for doubly doped La(Sr)Ga(Mg)O3 (LSGM). Doping alkaline earth cations for the Pr site and Mg for the Ga site of the PrGaO3 increased its oxide ion conductivity. For temperatures above 1073 K, the highest oxide ion conductivity was obtained for the composition of Pr0.93Sr0.07Ga0.85Mg0.15O3 (PSGM). On the other hand, the apparent activation energy of Pr0.93Ca0.07Ga0.85M0.15O3 (PCGM) was as low as 0.65 eV. Therefore, the electrical conductivity of PCGM was higher than that of LSGM at temperatures below 873 K. Although hole conduction was observed, electron conductivity of the doubly doped PrGaO3 was almost independent of the oxygen partial pressure from pO(2) = 1 to 10-21 atm. It is clear that doped PrGaO3 is a new fast oxide ion conductor over a wide range of oxygen partial pressures. On the other hand, a nonlinearity was observed on the Arrhenius plot of electrical conductivity for Ca-doped PrGaO3 and the high temperature X-ray diffraction (XRD) measurement suggested that it was due to phase transition from orthorhombic to rhombohedral or tetragonal, which may decrease the mobility of oxide ions. Application of PSGM and PCGM for an electrolyte of solid oxide fuel cell was also investigated in order to cross-check the findings of the fast oxide ion conductivity. This study revealed that PSGM and PCGM were a new family of fast oxide ion conductors.

Original languageEnglish
Pages (from-to)1643-1649
Number of pages7
JournalJournal of the Electrochemical Society
Volume146
Issue number5
DOIs
Publication statusPublished - May 1999
Externally publishedYes

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Perovskite
Oxides
Ions
conductivity
oxides
ions
conduction
Partial pressure
partial pressure
conductors
Oxygen
Arrhenius plots
electrical resistivity
perovskite
oxygen
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Temperature
Electrolytes
Cations

All Science Journal Classification (ASJC) codes

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Oxide ion conductivity in doubly doped PrGaO3 perovskite-type oxide. / Ishihara, Tatsumi; Furutani, Haruyoshi; Arikawa, Hiroshi; Honda, Miho; Akbay, Taner; Takita, Yusaku.

In: Journal of the Electrochemical Society, Vol. 146, No. 5, 05.1999, p. 1643-1649.

Research output: Contribution to journalArticle

Ishihara, T, Furutani, H, Arikawa, H, Honda, M, Akbay, T & Takita, Y 1999, 'Oxide ion conductivity in doubly doped PrGaO3 perovskite-type oxide', Journal of the Electrochemical Society, vol. 146, no. 5, pp. 1643-1649. https://doi.org/10.1149/1.1391820
Ishihara, Tatsumi ; Furutani, Haruyoshi ; Arikawa, Hiroshi ; Honda, Miho ; Akbay, Taner ; Takita, Yusaku. / Oxide ion conductivity in doubly doped PrGaO3 perovskite-type oxide. In: Journal of the Electrochemical Society. 1999 ; Vol. 146, No. 5. pp. 1643-1649.
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AU - Takita, Yusaku

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AB - In this study, oxide ion conduction characteristics of doubly doped PrGaO3 were investigated. It is found that PrGaO3 doped with Sr (or Ca) for the Pr site and Mg for the Ga site exhibits the high oxide ion conduction which was slightly less than that measured for doubly doped La(Sr)Ga(Mg)O3 (LSGM). Doping alkaline earth cations for the Pr site and Mg for the Ga site of the PrGaO3 increased its oxide ion conductivity. For temperatures above 1073 K, the highest oxide ion conductivity was obtained for the composition of Pr0.93Sr0.07Ga0.85Mg0.15O3 (PSGM). On the other hand, the apparent activation energy of Pr0.93Ca0.07Ga0.85M0.15O3 (PCGM) was as low as 0.65 eV. Therefore, the electrical conductivity of PCGM was higher than that of LSGM at temperatures below 873 K. Although hole conduction was observed, electron conductivity of the doubly doped PrGaO3 was almost independent of the oxygen partial pressure from pO(2) = 1 to 10-21 atm. It is clear that doped PrGaO3 is a new fast oxide ion conductor over a wide range of oxygen partial pressures. On the other hand, a nonlinearity was observed on the Arrhenius plot of electrical conductivity for Ca-doped PrGaO3 and the high temperature X-ray diffraction (XRD) measurement suggested that it was due to phase transition from orthorhombic to rhombohedral or tetragonal, which may decrease the mobility of oxide ions. Application of PSGM and PCGM for an electrolyte of solid oxide fuel cell was also investigated in order to cross-check the findings of the fast oxide ion conductivity. This study revealed that PSGM and PCGM were a new family of fast oxide ion conductors.

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