合成コーデイーライトの熱膨張

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Thermal expansion of synthetic cordierite was determined along a and c axes respectively, with the aid of Geiger Counter X-ray Diffractometer in which a small electro-furnace was settled. From room temperature to 140°C, a0 was fair enlarged but c0 was remarkably diminished. This fact seems to be responsible for the negative expansion at the lower temperature in cordierite porcelain. From 140°C to 303°C, a0 and c0 were simultaneously enlarged. From 303°C to 555°C, c0 was enlarged as before, while a0 ceased the further enlargement at least within this temperature scope. This may suggest the presence of a prompt type inversion of this crystal during the heating.
社団法人日本セラミックス協会の論文