Abstract
In the literature concerning the deterioration of steatite (H. Thurnaure, A. R. Rodriguez, J. Am. Ceram. Soc., 25, 443 (1942); W. R. Foster, J. Am. Ceram. Soc., 34, 255 (1951)) the growth of magnesium metasilicate formed in the body, or the transformation of protoenstatite comming out in the cooling period were said as the principal sources of this defect. However, there is no example of discussing in detail on the influence of glass phase coexisting in the body.The author has carried out the investigations on the characteristic properties of MgSiO3 with and without glass phase in high temperatures using X-ray diffraction, differential thermal analysis, dilatmetric method and electron microscope. The MgSiO3 without glass phase showed the same characteristicsof transformation as pointed out by W. R. Foster (l. c.), while the MgSiO3 with glass phase (protoenstatite), when quenched in some degree, was readily super cooled to secure the stability at an ordinary temperature.Based on his experimental results the author discussed the deterioration of steatite pointing out that the devitrification in glass or liquid phase caused by the shift of phase equilibrium in the body in the cooling period plays the leading roll in this phenomenon.
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