TY - JOUR
T1 - Mixed dopant effect in SrZrO3-based proton conductor
AU - Omata, Takahisa
AU - Fuke, Tomonao
AU - Otsuka-Yao-Matsuo, Shinya
PY - 2008/9/15
Y1 - 2008/9/15
N2 - The infrared diffuse reflectance spectra in the O-H stretching vibration, νOH, region and the electrical conductivities of Sr(Zr0.92Y0.08 - xScx)O3 - δ and Sr(Zr0.92Y0.08 - xGax)O3 - δ were studied. Whereas the dissolution environment of the proton and the dopant in the terminal compounds was maintained in the Sr(Zr0.92Y0.08 - xScx)O3 - δ, distinctly different proton sites from those in the terminal Sr(Zr0.92Y0.08)O3 - δ and Sr(Zr0.92Ga0.08)O3 - δ appeared in the Sr(Zr0.92Y0.08 - xGax)O3 - δ. The electrical conductivity of the Sr(Zr0.92Y0.08 - xScx)O3 - δ showed a very small increase upon substitution of Y by Sc. The small increase in conductivity for the Sc-doped case was discussed from the viewpoint of proton mobility. For the Sr(Zr0.92Y0.08 - xGax)O3 - δ, the conductivity decreased over an order of magnitude by the substitution of Y by Ga. This decrease in conductivity for the Ga-doped case was attributed to the decrease in the proton concentration.
AB - The infrared diffuse reflectance spectra in the O-H stretching vibration, νOH, region and the electrical conductivities of Sr(Zr0.92Y0.08 - xScx)O3 - δ and Sr(Zr0.92Y0.08 - xGax)O3 - δ were studied. Whereas the dissolution environment of the proton and the dopant in the terminal compounds was maintained in the Sr(Zr0.92Y0.08 - xScx)O3 - δ, distinctly different proton sites from those in the terminal Sr(Zr0.92Y0.08)O3 - δ and Sr(Zr0.92Ga0.08)O3 - δ appeared in the Sr(Zr0.92Y0.08 - xGax)O3 - δ. The electrical conductivity of the Sr(Zr0.92Y0.08 - xScx)O3 - δ showed a very small increase upon substitution of Y by Sc. The small increase in conductivity for the Sc-doped case was discussed from the viewpoint of proton mobility. For the Sr(Zr0.92Y0.08 - xGax)O3 - δ, the conductivity decreased over an order of magnitude by the substitution of Y by Ga. This decrease in conductivity for the Ga-doped case was attributed to the decrease in the proton concentration.
KW - Dopant segregation
KW - Infrared spectroscopy
KW - Proton conductor
KW - Proton dissolution environment
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U2 - 10.1016/j.ssi.2008.01.029
DO - 10.1016/j.ssi.2008.01.029
M3 - Article
AN - SCOPUS:48349133017
SN - 0167-2738
VL - 179
SP - 1116
EP - 1119
JO - Solid State Ionics
JF - Solid State Ionics
IS - 21-26
ER -