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Translucent Ceramics of 12CaO · 7Al2O3 with Microporous Structure

Published online by Cambridge University Press:  31 January 2011

Katsuro Hayashi ,
Masahiro Hirano  and
Hideo Hosono
Katsuro Hayashi
Affiliation:
Hosono Transparent Electro-Active Materials Project, ERATO, Japan Science and Technology Corporation, KSP C-1232, 3–2-1 Sakado, Takatsu-ku, Kawasaki 213–0012, Japan
Masahiro Hirano
Affiliation:
Hosono Transparent Electro-Active Materials Project, ERATO, Japan Science and Technology Corporation, KSP C-1232, 3–2-1 Sakado, Takatsu-ku, Kawasaki 213–0012, Japan
Hideo Hosono
Affiliation:
Hosono Transparent Electro-Active Materials Project, ERATO, Japan Science and Technology Corporation, KSP C-1232, 3–2-1 Sakado, Takatsu-ku, Kawasaki 213–0012, Japan
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Abstract

We examined the densification of 12CaO · 7Al2O3 (C12A7), which has a microporous lattice framework with a cavity of approximately 0.4 nm. Fully densified translucent ceramics are obtained when hydrated C12A7 powders prepared as precursors are sintered in a dry oxygen atmosphere at 1300 °C. The average transmittance between 400–800 nm for 1-mm-thick samples is improved up to approximately 70% with a 48-h increase in the sintering time. Dissociation of water molecules at the grain–pore interface into grains which entraps hydroxide ions in the crystallographic cage, and the release of the hydroxide ions into the atmosphere during the sintering procedure are considered to play crucial roles in the pore-annihilation processes.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 17 , Issue 6 , June 2002 , pp. 1244 - 1247
Copyright
Copyright © Materials Research Society 2002

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