2022 Fiscal Year Final Research Report

Formation Mechanism and Reproduction of Purplish Brown Color Shiso on Bizen Stoneware

Research Project

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Project/Area Number	19K05662
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
Research Institution	Okayama University of Science
Principal Investigator	Kusano Yoshihiro 岡山理科大学, 工学部, 教授 (40279039)
Co-Investigator(Kenkyū-buntansha)	福原実岡山理科大学, 工学部, 特任教授 (20150815) 牧涼介岡山理科大学, 工学部, 助教 (30881693)
Project Period (FY)	2019-04-01 – 2023-03-31
Keywords	セラミックス / 微構造 / 備前焼 / 色彩 / 電子顕微鏡 / 陶磁器
Outline of Final Research Achievements	Traditional Japanese Bizen stoneware is produced by firing a specific type of green clay in a wood-fired kiln. During this process, single crystalline branched dendrite-like particles of Al-substituted epsilon iron oxide are formed on the surface of the ceramic. Brownish colored samples like Bizen stoneware and with surface Al-substituted epsilon iron oxide particles were prepared by heating clay with potassium carbonate under a 10 vol% CO gas and 90 vol% Ar gas mixture using an electric furnace instead of a firewood kiln. Hence, a traditional method was adapted to achieve the industrial production of epsilon iron oxide crystals. Moreover, we succeeded in preparing epsilon iron oxide particles on a potash glass surface based on the heating condition of the brownish Bizen stoneware.
Free Research Field	無機材料化学
Academic Significance and Societal Importance of the Research Achievements	登り窯で焼成した備前焼の表面にのみ現れる茶系色の微構造を解明しただけでなく、呈色メカニズムを解明し、電気炉による焼成で再現することに成功した。薪の燃焼による二酸化炭素排出量の削減にもつながる成果である。更に、得られた結果を基に、先端材料の合成に応用することに成功した。伝統技術の中にも材料開発につながる有益な情報が含まれていることを明らかにした。