水和ジルコニア微粒子の生成過程に及ぼすZrOCl_2濃度と反応温度の影響

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The crystal phase, the primary particle size, and the formation rate of hydrous-zirconia fine particles produced by hydrolysis conditions of various ZrOCl_2 concentrations (0.05-0.4 mol・dm^<-3>) and reaction temperatures (358-373 K) were measured to clarify the effects of the ZrOCl_2 concentration and the reaction temperature on the formation process. Chemical analysis and X-ray diffraction measurements revealed that hydrous-zirconia particles synthesized from all of the hydrolysis conditions were similar to those observed in monoclinic crystalline ZrO_2, except that the crystal structure changed with increasing chlorine content at the preparation conditions of 0.4 mol・dm^<-3> and ≨363 K. The primary particle size of monoclinic hydrous-zirconia particles decreased with increasing ZrOCl_2 concentration and was independent of the reaction temperature. The rate constants (k) of hydrous-zirconia particles were determined experimentally by applying Avrami-Erofeev's equation. The determined k-value decreased, as the ZrOCl_2 concentration increased and the reaction temperature decreased. From Arrhenius plots of k, the activation energies for hydrous-zirconia particles in the monoclinic phase and containing high chlorine contents were determined to be 3.8×10^2-4.0×10^2 and 2.5×10^2 kJ・mol^<-1>respectively. The nucleation and the particle growth mechanisms of hydrous-zirconia particles were determined on the basis of the present experimental results.
社団法人日本セラミックス協会の論文
1999-10-01

水和ジルコニア微粒子の生成過程に及ぼすZrOCl_2濃度と反応温度の影響

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