水和ジルコニア微粒子の核生成及び結晶成長過程に及ぼす金属塩化物と HCl添加の影響

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The formation rate and the primary particle size of monoclinic hydrous-zirconia produced by the hydrolysis of ZrOCl_2 solutions with and without an addition of metal chlorides (NaCl, CaCl_2, or AlCl_3), or HCl were measured to clarify the effects of added metal chlorides and HCl on the nucleation and crystal growth processes of hydrous zirconia. Chemical kinetics analyses to which Avrami-Erofeev's equation was applied and X-ray diffraction measurements revealed that the rate constants and the primary particle sizes of hydrous-zirconia, under constant ZrOCl_2 concentration, decreased with increasing concentrations of added metal chloride or HCl. The nucleation and crystal-growth rates of primary particles of hydrous-zirconia were determined by analyzing the relationships between rate constant and primary particle size. The nucleation rate of hydrous-zirconia particles increased slightly increasing concentration of added HCl, but was independent of the kind and the concentration of added metal chlorides. The crystal-growth rate determined from ZrOCl_2 solutions with added metal chlorides decreased monotonously with increasing Cl^-ion concentration, and was independent of the kind and the concentration of added metal ions. In ZrOCl_2 solutions with added HCl, the crystal-growth rate decreased monotonously with inceasing Cl^- ion concentration, and the decrease tendency was greater than that of ZrOCl_2 solutions with added metal chlorides. This difference in decrease tendency on the crystal-growth rate can be explained by the blocking action on crystal growth of Cl^- ions attracted on the particle surface, through the formation of an electric double layer.
社団法人日本セラミックス協会の論文
2000-03-01

水和ジルコニア微粒子の核生成及び結晶成長過程に及ぼす金属塩化物と HCl添加の影響

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