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Download fileStudying and Utilizing Traditional Technologies: Microstructure and Formation Mechanism of ε‑Fe2O3 on Traditional Japanese Bizen Stoneware
journal contribution
posted on 2021-08-05, 12:34 authored by Yoshihiro Kusano, Hiroyuki Nakata, Zeliang Peng, Ryosuke S. S. Maki, Tomoyuki Ogawa, Minoru FukuharaTraditional Japanese Bizen stoneware
is produced by firing a specific
type of green clay in a wood-fired kiln at approximately 1200 °C.
During this process, single crystalline branched dendrite-like particles
of Al-substituted ε-Fe2O3 (ε-Fe1.7Al0.3O3) with widths and lengths of
approximately 15 and 30 μm, respectively, are formed on the
surface of the ceramic. Composite particles consisting of ε-Fe2O3 epitaxially connected to spinel structure compounds
[comprising the Fe-substituted spinel (Mg,Fe)(Al,Fe)2O4 and γ-Fe2O3)] with lengths of
approximately 3 μm are also generated. The present work clarified
the crystallographic relationship between ε-Fe2O3 and the spinel structure compounds. In addition, brown-colored
samples similar to Bizen pottery and with surface Al-substituted ε-Fe2O3 particles were prepared by heating clay with
K2CO3 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 ε-Fe2O3 crystals.
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3 μ msurface Al-substituted ε- Fe 2 O 3 ...30 μ mFormation Mechanismheating clayε- Fe 2 O 3 crystalsspinel structure compoundswood-fired kilnComposite particlesBizen potteryfirewood kilnbrown-colored samplesε- Fe 2 O 3dendrite-like particlesε- Fe 2 O 3 epitaxiallyFe-substituted spinelBizen stonewareK 2 CO 3