Abstract
The precipitation of CaF 2 from solutions with equivalent amounts of Ca(OH) 2 and HF has been studied at 25 and 37°C. The specific conductivity was measured during the precipitation, and the crystal sizes in the precipitates were measured at the end of the experiment by X-ray diffraction. The growth rate of the (100) face was calculated. The relationship between this growth rate and the supersaturation indicated a surface nucleation growth mechanism. The edge free energy was calculated to be (5.1 ± 0.2) × 10 -11 J/m at 25°C and (4.0 ± 0.1) × 10 -11 J/m at 37°C.
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