摘要
已制备了球形、尺寸分布很窄的粒子组成的YOHCO_3·H_2O及Y_2O_3均分散胶体。用电子显微镜、红外光谱及电导率等方法对这些均分散体系的组成及形成过程进行了初步探讨。
Monodispersed colloidal YOHCO_3·H_2O and Y_2O_3 systems consisting of spherical particles of narrow size distribution were obtained. The formation of those monodispersed colloidal systems was primarily investigated by using the techniques including transmision and scanning electron mieroseopy,IR spectroscopy and electrical conductivity. The change of electrical conductivity in the course of aging YCl_3 solution with urea revealed that the slow decomposition of urea and release of CO_3^(2-) at elevated temperature controlled the generation of prieipitation phase and provided necessary condition for formation of the mouodispersed system.
The transformation of calcining monodispersed powders of YOHCO_3·H_2O was observed through SEM.During the process of calcining YOHCO_3·H_2O at 850℃, the powders were melten first before formation of monodispersed spheres of Y_2O_3.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1991年第6期655-661,共7页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
关键词
均分散胶体
钇化合物
制备
胶体
Monodispersed colloid,YOHCO_3·H_2O, Y_2O_3, Preparation
