主催: The Ceramic Society of Japan
共催: Iketani Science and Technology Foundation, International Ceramic Federation, Commemorative Organization for the Japan World Exposition '70, The American Ceramic Society, The Australasian Ceramic Society, The Chinese Ceramic Society, The Korean Ceramic Society, Joint Research Consortium of Synergy Ceramics/Fine Ceramics Research Association, Nanotechnology Researchers Network Center of Japan, The Special Coordination Funds for Promoting Science and Technology, Japan National Tourist Organization, Aichi Prefectural Government, CASIO SCIENCE PROMOTION FOUNDATION, DAIKO FOUNDATION, Nagoya Convention and Visitors Bureau, The Asahi Glass Foundation, The Kao Foundation For Arts And Sciences, The Murata Science Foundation, The Ogasawara Foundation for the Promotion of Science & Engineering, ASAHI GLASS CO., LTD. Research Center, CENTRAL GLASS CO., LTD., ELECTRIC GLASS INDUSTRY ASSOCIATION OF JAPAN (EGAJ), Hattori Company, Ltd., Hitachi Research Laboratory, Hitachi, Ltd., HOYA CORPORATION, INAX Corporation, ITOCHU CERATECH CORP., Japan Cement Association, KYOCERA Corporation, KYUSHU REFRACTORIES CO., LTD., MINO CERAMIC CO., LTD., Murata Manufacturing Co., Ltd., NGK INSULATORS LTD., NGK SPARK PLUG CO., LTD., NICHIAS Corporation, NIKKO COMPANY, Nippon Electric Glass Co., Ltd., Nippon Sheet Glass Co., Ltd., NORITAKE CO., LIMITED, Tokuyama Corporation, TOTO LTD.
A series of giant magnetoresistance materials La0.5A0.5MnO3 (A=Ba, Sr, Ca) was hydrothermally prepared at 240°C for 1∼3 days and characterized by powder X-ray diffraction, scanning electron microscope, iodometry, and DC four-terminal method. The alkalinity and molar ratio of Mn(VII)/Mn2+ in the initial reaction mixture, associated with hydrothermal reaction temperature, dominate the crystallization of the products. The SEM images of the as-prepared La0.5Sr0.5MnO3 indicated that the product is cubic crystal about 2-5 μm, and the La0.5Ba0.5MnO3 is cubic crystal about 100-500 nm. The average valence state of manganate in all the products is 3.5.