Effect of Thermal Conductivity of Ambient Gas on Oscillatory Current with Hot Spot in SmBa2Cu3O7-δ Ceramic Rod

Yasuhiro IBARAKI; Tomoichiro OKAMOTO; Masasuke TAKATA

doi:10.14852/jcersjsuppl.112.0.S588.0

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.S588.0

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.

Ceramic letter

Effect of Thermal Conductivity of Ambient Gas on Oscillatory Current with Hot Spot in SmBa₂Cu₃O_7-δ Ceramic Rod

Yasuhiro IBARAKI, Tomoichiro OKAMOTO, Masasuke TAKATA

Author information

Keywords: SmBa₂Cu₃O_7-δ ceramic rod, Hot spot, Oscillatory current, Frequency, Thermal conductivity

CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

A hot spot, a local area with high temperature, appeared in a SmBa₂Cu₃O_7-δ ceramic rod when a dc voltage above the threshold was applied at room temperature. Under low oxygen partial pressure, a damped sinusoidal oscillation in the electrical current was observed after the appearance of the hot spot. The frequency of the current oscillation was found to increase when the thermal conductivity of ambient gas increased. The current oscillation associated with the hot spot is expected to be applicable to a variable low-frequency oscillator.

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