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*Kiyoshi Okada
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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Hisako Yoshizaki
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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Yoshikazu Kameshima
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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Akira Nakajima
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology