ジャイロライトの熱分解過程

概要

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The thermal decomposition processes of natural and synthesized gyrolite, which have a sheet silicate anion structure with Ca/Si molar ratio of 0.66, were com pared mainly by ^<29>Si MAS NMR. In the two samples, the silicate anions has the same structure (protonated Q^3), however their crystallinity was different. The protonated Q^3 structure in both samples decomposed gradually below 800℃ to form nonprotonated monomer (Q^0) and chain silicate (Q^1 and Q^2). Above 900℃, the natural gyrolite deconrposed to pseudo wollastonite and silica glass, while the synthesized one changed to pseudo wollastonite and cristobalite via wollastonite. These differences are believed to be caused by the differences in their crystallinity, decomposition rate and the flux effect resulting from the glassification of the impuri ties.
社団法人日本セラミックス協会の論文
1994-05-01