水和ジルコニア微粒子の生成速度に及ぼすZrOCl_2濃度の影響

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In present study, the relationships between the formation ratio and boiling time of hydrous-zirconia fine particles produced by the hydrolysis of aqueous solutions of ZrOCl_2 with 0.05-0.4mol・dm^<-3> concentrations were investigated.In particular, emphasis was placed on examining the effect of the ZrOCl_2 concentration on the formation rate of hydrous zirconia.The formation time of hydrous-zirconia particles increased with increasing ZrOCl_2 concentration.X-ray diffraction measurements revealed that hydrous-zirconia particles synthesized at any ZrOCl_2 concentration were similar to those observed for monoclinic crystalline ZrO_2.Based on these experimental results, the formation-rate constants(k) of hydrous-zirconia particles produced at 0.05-0.4mol・dm^<-3> concentrations were determined experimentally by assuming the formation processes and estimating appropriate values for the acid-dissociation constants.It was clarified that the determined k-value decreased with increasing ZrOCl_2 concentration.The decrease of the k-value can be explained by the decrease of the k(I)-term in the ionic strength function contained in k.
社団法人日本セラミックス協会の論文
1998-09-01