Dependence of dopant cations on microstructure and proton conductivity of barium zirconate

S. Imashuku; T. Uda; Y. Nose; G. Taniguchi; Y. Ito; Y. Awakura

doi:10.1149/1.2999335

Dependence of dopant cations on microstructure and proton conductivity of barium zirconate

S. Imashuku, T. Uda, Y. Nose, G. Taniguchi, Y. Ito, Y. Awakura

Research output: Contribution to journal › Article › peer-review

54 Citations (Scopus)

Abstract

The effects of various cations (Mg2+, In3+, Yb3+, Tm3+, Er3+, Ho3+, Gd3+, Nd3+, La3+, Bi3+, and Ga3+) were examined as dopants into the B site of perovskite barium zirconate. The solubility of In, Yb, Tm, Er, and Ho, whose ionic radii are close to that of zirconium ion, into the B site is more than 0.075 (XMO1.5 =0.075) at 1600°C. In contrast, when there is a large difference of ionic radii between trivalent cations (Nd3+, La3+, Bi3+, and Ga3+) and zirconium ion, the solubility of trivalent cations into barium zirconate is less than XMO1.5 =0.075. The microstructure of sintered pellets and their conductivity in wet atmosphere were investigated. We could divide dopants into two classes based on the extent of proton conductivity and microstructure: "Y-type" and "Sc-type" dopants. Yb, Ho, Er, and Tm belong to Y-type dopants, which have a microstructural mixture of coarse and fine grains and higher proton conductivity. In belongs to Sc-type dopants, which have well-grown grains and lower proton conductivity.

Original language	English
Pages (from-to)	B1-B8
Journal	Journal of the Electrochemical Society
Volume	156
Issue number	1
DOIs	https://doi.org/10.1149/1.2999335
Publication status	Published - 2009 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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title = "Dependence of dopant cations on microstructure and proton conductivity of barium zirconate",

abstract = "The effects of various cations (Mg2+, In3+, Yb3+, Tm3+, Er3+, Ho3+, Gd3+, Nd3+, La3+, Bi3+, and Ga3+) were examined as dopants into the B site of perovskite barium zirconate. The solubility of In, Yb, Tm, Er, and Ho, whose ionic radii are close to that of zirconium ion, into the B site is more than 0.075 (XMO1.5 =0.075) at 1600°C. In contrast, when there is a large difference of ionic radii between trivalent cations (Nd3+, La3+, Bi3+, and Ga3+) and zirconium ion, the solubility of trivalent cations into barium zirconate is less than XMO1.5 =0.075. The microstructure of sintered pellets and their conductivity in wet atmosphere were investigated. We could divide dopants into two classes based on the extent of proton conductivity and microstructure: {"}Y-type{"} and {"}Sc-type{"} dopants. Yb, Ho, Er, and Tm belong to Y-type dopants, which have a microstructural mixture of coarse and fine grains and higher proton conductivity. In belongs to Sc-type dopants, which have well-grown grains and lower proton conductivity.",

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T1 - Dependence of dopant cations on microstructure and proton conductivity of barium zirconate

AU - Imashuku, S.

AU - Uda, T.

AU - Nose, Y.

AU - Taniguchi, G.

AU - Ito, Y.

AU - Awakura, Y.

PY - 2009/1/1

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N2 - The effects of various cations (Mg2+, In3+, Yb3+, Tm3+, Er3+, Ho3+, Gd3+, Nd3+, La3+, Bi3+, and Ga3+) were examined as dopants into the B site of perovskite barium zirconate. The solubility of In, Yb, Tm, Er, and Ho, whose ionic radii are close to that of zirconium ion, into the B site is more than 0.075 (XMO1.5 =0.075) at 1600°C. In contrast, when there is a large difference of ionic radii between trivalent cations (Nd3+, La3+, Bi3+, and Ga3+) and zirconium ion, the solubility of trivalent cations into barium zirconate is less than XMO1.5 =0.075. The microstructure of sintered pellets and their conductivity in wet atmosphere were investigated. We could divide dopants into two classes based on the extent of proton conductivity and microstructure: "Y-type" and "Sc-type" dopants. Yb, Ho, Er, and Tm belong to Y-type dopants, which have a microstructural mixture of coarse and fine grains and higher proton conductivity. In belongs to Sc-type dopants, which have well-grown grains and lower proton conductivity.

AB - The effects of various cations (Mg2+, In3+, Yb3+, Tm3+, Er3+, Ho3+, Gd3+, Nd3+, La3+, Bi3+, and Ga3+) were examined as dopants into the B site of perovskite barium zirconate. The solubility of In, Yb, Tm, Er, and Ho, whose ionic radii are close to that of zirconium ion, into the B site is more than 0.075 (XMO1.5 =0.075) at 1600°C. In contrast, when there is a large difference of ionic radii between trivalent cations (Nd3+, La3+, Bi3+, and Ga3+) and zirconium ion, the solubility of trivalent cations into barium zirconate is less than XMO1.5 =0.075. The microstructure of sintered pellets and their conductivity in wet atmosphere were investigated. We could divide dopants into two classes based on the extent of proton conductivity and microstructure: "Y-type" and "Sc-type" dopants. Yb, Ho, Er, and Tm belong to Y-type dopants, which have a microstructural mixture of coarse and fine grains and higher proton conductivity. In belongs to Sc-type dopants, which have well-grown grains and lower proton conductivity.

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