HgI_2在KI水溶液中溶解度测定及晶体生长

Determination of Solubility in KI Aqueous Solution for HgI_2 and Its Crystal Growth

通过测定不同温度下Hg I2在浓度分别为0.25 mol/L,0.50 mol/L,0.75 mol/L,1.00 mol/L的KI水溶液中的溶解度,绘制了溶解度曲线。结果表明:KI水溶液浓度一定时,温度对Hg I2在KI溶液中的溶解度影响很小;温度一定时,随着KI水溶液浓度增大,Hg I2的溶解度大幅度增大;随着KI水溶液浓度的增大,温度对Hg I2在KI水溶液中的溶解度变化的影响增大。根据所得到的Hg I2-KI-H2O体系性质,选取1.00 mol/L的KI水溶液溶解碘化汞,通过缓慢降温,利用顶部籽晶法生长碘化汞晶体,得到了重达17.4 g的鲜红透明的晶体。

On the basis of the determination of solubility for Hg I2 in KI aqueous solution with the concentrations of 0. 25 mol / L,0. 50 mol / L,0. 75 mol / L and 1. 00 mol / L,respectively,the solubility curves of Hg I2 was drawn. The result indicates that a large increase in solubility of Hg I2 as the concentration of KI aqueous solution increases in solution which shows only a small temperature dependence. As the concentration of KI aqueous solution increasing,the temperature dependence for solubility of Hg I2 increases. Based on the obtained relevant information for properties of Hg I2-KI-H2 O system,the KI aqueous solution with appropriate concentration of 1. 00 mol / L was used for the solvent of Hg I2. Top-seeded solution growth was applied to crystal growth of Hg I2 by slowly cooling the system,and the bright red,transparent Hg I2 crystal with the mass of 17. 4 g was obtained.