アルカリハライドフラックスによるシリカゲルからα-石英の結晶成長

概要

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Crystals of α-quartz were obtained from a silica gel in alkali halides. We found that the addition of LiCl to NaBr provides the most suitable flux. The gel was heated to 850°C, and cooled slowly near the transition temperature. By this treatment β-quartz was converted to α-quartz. The following results were obtained.(1) The NaBr-LiCl system provides the best flux for the crystallization of α-quartz. The best flux molar ratio R1 (=NaBr/LiCl) for obtaining α-quartz was 9.7/0.3.(2) The crystal size decreased with decreasing ratio R2 (=silica gel/flux, molar ratio) from 0.1 to 0.01, and reached a maximum (0.5×0.5×1.2mm).(3) When 1wt%-CaCO3 was added to the flux under conditions (1) and (2), an α-quartz crystal with a maximum size of 0.5×0.5×2.5mm were obtained.
社団法人日本セラミックス協会の論文
1986-10-01