Affiliation: | Central Research Laboratory, Onoda Cement Company, Ltd., 2-2-4 Ohsaku, Sakura, Chiba, 285 Japan;Basic Research Center, INAX Corporation, Minato-machi, Tokoname, Aichi, 475 Japan;Ceramics Research Laboratory, Nagoya Institute of Technology, Asahigaoka, Tajimi, Gifu, 507 Japan |