Preparation of Monodispersed Colloidal Particles of Yttrium Compound by Homogeneous Precipitation. I.Effect of <tex>$Y(NO_3)_3$</tex> Concentration

,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 33(5); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(5): 495.

균일침전법에 의한 균일입도 초미분 이트륨화합물의 제조에 관한 연구 I. $Y(NO_3)_3$ 농도의 영향

권영식, 김연식¹

고려아연주식회사 기술연구소
¹서울대학교 공과대학 재료공학부

Preparation of Monodispersed Colloidal Particles of Yttrium Compound by Homogeneous Precipitation. I.Effect of $Y(NO_3)_3$ Concentration

ABSTRACT

Monodispersed colloidaly yttria(Y2O3) can be used in a variety of applications such as phosphors. IR transparent materials and fine ceramics. For preparing monodispersed yttria homogeneous precipitation has been regarded as a fovorable method that is monodispersed yttria can be obtained through calcining monodispersed colloidal compound of yttrium (eg:Y(OH)CO3.nH2O)which can be prepared by homogeneous precipitation with urea. It is however still required to find out the quantitative effects of important variables of precipitation such as concentration of yttrium and urea reaction temperature and initial pH of reactant even though homogeneous precipitation of Y3+ with urea has been studied extensively. Among the effects of these variables we investiga-ted 1) the effect of yttrium concentration on the shape and size of precipitate and the reation rate 2) range of yttrium concentration required to make monodispersed colloidal particles 3) the reason for limited concentra-tion range of yttrium and 4) the effect of ultrasonic radiation on the limited concentration.

Key words: Homogeneous precipitation, Yttrium, Urea Yttria, Monodispersed colloidal particle