pH值对Bi_4Ti_3O_（12）溶胶水解特性的影响

EFFECT OF pH VALUE ON THE HYDROLYSIS PROPERTIES OF Bi 4Ti 3O 12 SOLUTION

报导了前驱体溶液的ｐＨ值对Ｂｉ－Ｔｉ溶液的水解特性的影响，并探讨了乙醇胺的催化作用机理。研究表明，乙醇胺可调节溶液的ｐＨ值，其机理是与ＨＡｃ反应，并与Ｂｉ＋离子生成稳定的络合物．前驱体溶液的ｐＨ值是决定溶胶、凝胶质量的主要因素．ｐＨ值较小时，溶液容易产生沉淀；ｐＨ值较大时，溶液中有大量的浑浊物；只有ｐＨ值在２．

The transparent sols were prepared from Ti(OC 4H 9) 4 and Bi(NO 3) 3. The catalysis mechanism of ethanolamine on the solution is studied. We found that the ethanolamine can adjust pH value of the solution and also stabilize it by bismuthic complex compound. The pH value of the solution is mainly factor affecting formation of the Sol and Gel. The solution of low pH value is easily formed precipitate; the solution of high pH value is tubid. The solution of pH value between 2.5 and 4 can forms stable sol and homogenous gel.