Papers by Author: Hiroshi Kishi

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Authors: Koichiro Morita, Youichi Mizuno, Hirokazu Chazono, Hiroshi Kishi
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Authors: Daiki Ishii, Toshimasa Suzuki, Hiroshi Kishi, Isao Sakaguchi, Naoki Ohashi, Hajime Haneda
Abstract: Oxygen diffusivity in strontium titanate films with intentional non-stoichiometry, Sr1+xTi1+yOδ with (1+x)/(1+y) = 0.71.5, was studied to reveal degradation behavior of Sr1+xTi1+yOδ films. In order to utilize isotope tracer diffusion measurement, so-called gas/solid exchange method using 18O2 gas, at relatively low temperature, very thin YSZ layer deposited on top of Sr1+xTi1+yOδ film was used as catalyst for enhanced 18O[gas]/16O[solid] exchange at lower temperature. As a result, very high oxygen diffusivity at 673 K in Sr1+xTi1+yOδ films with (1+x)/(1+y)>>1 was observed.
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