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用汞阴极电解法制备锂汞齐和钙汞齐.用毛细管取一小滴汞齐挂于悬汞电极上,以悬汞电极作工作电极,用计时安培法在-0.2V下测定了锂、钙在汞中的扩散系数.在25℃下其值为:D_(li)=(8.65±0.17)×10~(-6)cm~2/s;D_(ca)=(7.43±0.16)×10~(-6)cm~2/s.用Sutherland-Einstein扩散方程式计算了汞中扩散粒子半径,其值分别为247pm和288pm.这些数值说明锂和钙都是以金属间化合物的状态存在于汞中.
Preparation of lithium amalgam and calcium amalgam by mercury cathodic electrolysis.A small drop of mercury amalgam was hung on the hanging mercury electrode with a capillary and a hanging mercury electrode was used as a working electrode.The lithium ampere was measured at -0.2V with a time amperometric method, Diffusion coefficient of calcium in mercury, its value at 25 ℃ is: D li = 8.65 ± 0.17 × 10 -6 cm 2 / s D ca = 7.43 ± 0.16 × 10 ~ (-6) cm ~ 2 / s. The diffusion radius of mercury in mercury was calculated by the Sutherland-Einstein diffusion equation and the values were 247 and 288 pm, respectively. These values indicate that both lithium and calcium exist in the intermetallic state Mercury.