Hot Spot in LnBa2Cu3O7-δ Ceramics and Its Applications

Tomoichiro OKAMOTO; Yasuhiro IBARAKI; Masasuke TAKATA

doi:10.14852/jcersjsuppl.112.0.S582.0

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue

Session ID : 8

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S582.0

Conference information

Host: The Ceramic Society of Japan

Co-host: 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.

Review

Hot Spot in LnBa₂Cu₃O_7-δ Ceramics and Its Applications

Tomoichiro OKAMOTO, Yasuhiro IBARAKI, Masasuke TAKATA

Author information

Keywords: Hot spot, PTC, Constant-current, Oxygen sensor, Flow-meter, Low-frequency oscillator

CONFERENCE PROCEEDINGS FREE ACCESS

Details

Abstract

A hot spot, which is a local area glowing orange, appears in a LnBa₂Cu₃O_7-δ (Ln: rare earth element) ceramic rod when a voltage exceeding a certain value is applied to the rod at room temperature. The rod with the hot spot shows various functional characteristics that give rise to applications in devices such as a constant-current generator, an oxygen sensor, a flowmeter and a low-frequency oscillator. In this paper, general features of the hot spot and various applications are reviewed. The hot spot is considered to appear in ceramics with a positive temperature coefficient of resistivity. New application fields may be created from the related researches.

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