超细均分散稀土化合物胶粒的生长动力学

Growth Kinetics of Ultrafine Monodispersed Colloidal Particles of RE Compounds

研究了尿素体系中超细均分散碳酸钕/碱式碳酸钇胶粒形成时,粒子的尺寸随时间的变化规律,并运用Nielsen的时间因子分析法(Chronomal Analysis)表征了两种胶粒的生长机理,获得了相应的速率常数.实验表明,两种胶粒的生长(<40min)主要遵循表面反应控制的一级多核层增长机理.

The change in size of ultrafine monodispersed colloidal particles of basic yttrium carbonate and neodymium normal carbonate with time from solutions of their corresponding salts, respectively, were followed in the presence of urea. Nielsen's chronomal analysis were used to characterize the growth mechanism and to obtain rate constants. Growths of both particles are thought to be one-order polynuclear layer growth mechanism.