Characteristics of Oxygen Sensor Exploiting the Hot Spot in  BaAl2O4-added GdBa2Cu3O7-δ Composite Ceramic Rod

Tomoichiro OKAMOTO; Masasuke TAKATA

doi:10.14852/jcersjsuppl.112.0.S567.0

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

Session ID : 7

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S567.0

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.

Papers

Characteristics of Oxygen Sensor Exploiting the Hot Spot in BaAl₂O₄-added GdBa₂Cu₃O_7-δ Composite Ceramic Rod

Tomoichiro OKAMOTO, Masasuke TAKATA

Author information

Keywords: Oxygen sensor, Hot spot, GdBa₂Cu₃O_7-δ, BaAl₂O₄, Composite, Current-voltage Characteristic, Durability

CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

GdBa₂Cu₃O_7-δ-based composite ceramics with various BaAl₂O₄ contents were prepared by solid-state reaction. From the elemental maps of Al and Cu measured using an electron probe microanalyzer, BaAl₂O₄ grains were clearly distinguished from GdBa₂Cu₃O_7-δ grains. When a certain voltage was applied to the composite rod electric current decreased abruptly, and a hot spot appeared in the rod. After the appearance of the hot spot, the current remained constant with increasing voltage. The electric power required to melt the rod significantly increased upon adding BaAl₂O₄. The current after the appearance of the hot spot depended on the oxygen partial pressure in the ambient atmosphere. Compared with the GdBa₂Cu₃O_7-δ rod, the composite rod showed high durability for sensing applications even in high oxygen partial pressure. The results revealed that the BaAl₂O₄-added GdBa₂Cu₃O_7-δ composite ceramics is a promising material for use as an oxygen sensor exploiting the hot spot.

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