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Citation: Wang Guang-Xin, Zhao Chang-Gui, Chen Zong-Qi, Zhang Yu-Ling. Study on Monodispersed Colloid I. Formation of Monodispersed Colloidal Yttrium Compound System[J]. Acta Physico-Chimica Sinica, ;1991, 7(06): 655-661. doi: 10.3866/PKU.WHXB19910605 shu

Study on Monodispersed Colloid I. Formation of Monodispersed Colloidal Yttrium Compound System

1.
Department of Applied Chemistry, Qingdao Institute of Chemical Technology, Qingdao 266042; Institute of Physics, Chinese Academy of Sciences

Received Date: 9 May 1990
Available Online: 15 December 1991

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 pricipitation phase and provided necessary condition for formation of the monodispersed 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.
- Monodispersed colloid; YOHCO₃•H₂O; Y₂O₃; Preparation
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