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作 者:王桂美[1] 高绍康[1] 陈建中[1] 庄乃锋[1]
出 处:《人工晶体学报》2005年第1期75-78,共4页Journal of Synthetic Crystals
基 金:福建省教育厅资助科研项目(JA02155)
摘 要:本文研究了用盐酸酸沉仲钼酸铵溶液制备四钼酸铵的成核过程,测量了以诱导期表示的成核速率,讨论了温度和过饱和比对成核速率的影响。结果表明,四钼酸铵过饱和溶液的成核速率随着温度的升高和过饱和比的增大而增大。确定了在实验的温度范围内均匀成核和非均匀成核之间的界限,并根据均匀成核理论计算了其成核特征参数。The nucleation in the supersaturated solutions of ammonium tetramolybdate prepared from acidified ammonium heptamolybdate solutions is studied in this paper. The nucleation rates as indicated by the induction period were measured. Effects of temperature and supersaturation on the nucleation rate were discussed. The results in good accordance with the classical nucleation theory show that the nucleation rate of ammonium tetramolybdate increases with increases of temperature and supersaturation. The interfacial tensions of homogeneous nucleation and heterogeneous nucleation decrease with increase of temperature in the range of 295.15 K to 311.15 K.
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