共沉淀法制备钒掺杂钛酸铋粉体及其陶瓷性能研究

Preparation of Vanadium Doped Bi_4Ti_4O_(12) Powder by Co-precipitation and Dielectric Property of Sintered Ceramics

采用共沉淀法制备了掺钒钛酸铋粉体,研究了粉体的晶化过程、微观形貌和烧结性能.与传统固相反应法相比,共沉淀法合成钛酸铋相的反应可在550℃完成,比固相反应法低250℃左右,所得粉体的粒径<100nm.此外,共沉淀法制备的粉体具有良好的烧结性能,在900℃达到理论密度的96%.与固相法烧结陶瓷相比,共沉淀粉体制备的材料具有更低的介电损耗.

Vanadium doped Bi4Ti3O12 powder was prepared by a co-precipitation method and its phase evolution process, microstructure and sintering behavior were investigated. The results indicate that Bi4Ti3O12 crystalline phase with grain sizes of less than 100nm can be obtained by calcination of the precursor at 550℃, which is 250℃ lower than that of traditional solid reaction. The powder possesses a good sintering activity and the bulk density of sintered samples can reach 96% of theoretical value when sintering at 900℃ for lh. In comparison to the material prepared by solid reaction, the sample made from the co-precipitation powder also has lower dielectric loss.