水晶の成長の速度論 : オートクレーブ内溶液温度による考察

概要

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Growth rates of quartz crystals are discussed on the basis of the in situ determination of the solution temperature in an autoclave, in order to obtain exact values of kinetics in hydrothermal growth. The solution temperature under hydrothermal condition was directly determined using a specially designed autoclave, in which thermometers were inserted. The temperature of the growth solution in the autoclave was generally indicated between 10 and 30℃ lower than that measured from the outside of the autoclave body. It was found that the temperatures of the growth zone show periodical oscillation at ± 2 or ± 3℃, whereas that of dissolution zone of nutrient was nearly held at a constant temperature. Hydrothermal growth kinetics of quartz crystals was reconsidered on the basis of the solution temperature in the autoclave. The activation energies in the normal direction of the basal face (0001) gradually change from 16 kcal/mol to 22 kcal/mol, as the temperature difference ΔT between growth and dissolution zones decreases from 25 to 10℃. The activation energies in the direction of the a-axis <1120> were independent of the ΔT's and showed 13 kcal/mol.
1978-12-25