Effect of Substitution of Si with Ge and Te on Ionic Conductivity  of Na5SmSi4O12-Type Glass-Ceramics

Toshinori OKURA; Hideki MONMA; Kimihiro YAMASHITA

doi:10.14852/jcersjsuppl.112.0.S685.0

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

Session ID : 9

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S685.0

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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

Effect of Substitution of Si with Ge and Te on Ionic Conductivity of Na₅SmSi₄O₁₂-Type Glass-Ceramics

Toshinori OKURA, Hideki MONMA, Kimihiro YAMASHITA

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Keywords: Na₂O-Sm₂O₃-GeO₂-SiO₂, Na₂O-Sm₂O₃-TeO₂-SiO₂, Na₅RSi₄O₁₂-type, Superionic conduction, Glass-ceramics, Crystallization

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Abstract

Glass-ceramics of the germanium- or tellurium-containing Na₅RSi₄O₁₂-type (R=rare earth; Sm) Na⁺-superionic conductors (N5SXS) were prepared by crystallization of glasses with the composition Na_3+3xSm_1-xX_ySi_3-yO₉ (X=Ge; NSGS, X=Te; NSTS), and the effects of X elements on the separation of the phase and the microstructural effects on the conduction properties of glass-ceramics were discussed. Their conductivities and activation energies are of the order of 10^-2 S/cm at 300°C and of 19 to 23 kJ/mol, respectively. The conductivity of the phosphorus-containing N5SPS and N5SXS decreases with the increase of the (P, X)-O bond length, giving the order N5SPS>N5SGS>N5STS.

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