Abstract
KCl crystals were grown from aqueous solution by the evaporation method at the growth temperature of 40°C, the Pb ion concentration was 0–1/2000 in molar fraction, the pH was 2.0–4.0, the evaporation rate 0.4–1.1 g/day and the duration of growth 5–32 days. The results obtained are summarized as follows. (1) Pb ion addition played the most important role for growing larger KCl crystals, since it reduced the generation of parasite crystals. (2) Growth shape changed from cubic to octahedral with increasing Pb ion concentration. (3) Dislocation density in the crystals grown from seeds was always much higher than that in the crystals grown from spontaneous nuclei. Some crystals grown from spontaneous nuclei were nearly free of dislocations. (4) Growth striations were always observed on the etched {100} surfaces of KCl crystals grown in this work. A growth history could be seen from the change of striation pattern with the growth.
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