Synthesis of β-Co(OH)2 Plate-like Crystallites and Their Hydrothermal Growth

Changtai XIA; Hiroshi ITAHARA; Shin TAJIMA; Toshihiko TANI

doi:10.14852/jcersjsuppl.112.0.S73.0

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

Session ID : 1

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S73.0

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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

Synthesis of β-Co(OH)₂ Plate-like Crystallites and Their Hydrothermal Growth

Changtai XIA, Hiroshi ITAHARA, Shin TAJIMA, Toshihiko TANI

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Keywords: β-Co(OH)₂, Platelet, Template, Precipitation, Hydrothermal, Textured ceramic

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Abstract

Well-faceted hexagonal plate-like particles of β-Co(OH)₂ have been prepared by a precipitation method. α-Co(OH)₂ was formed first, and then transformed to β-Co(OH)₂ with a typical size of 0.5×0.1 μm. Growth of β-Co(OH)₂ micro-crystals up to 9×0.5 μm was carried out in NaOH aqueous solutions under hydrothermal conditions. The basal plane of the synthesized β-Co(OH)₂ platelets was {001}, as revealed by oriented particulate monolayer X-ray diffraction (OPML-XRD), which was kept after hydrothermal growth. The obtained platelets are considered to be suitable templates for the fabrication of textured layered-cobaltite thermoelectric ceramics by the reactive-templated grain growth (RTGG) method.

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