Preparation And Characterization Of Titanate Materials

Hexagonal zinc titanate is a kind of microwave dielectric ceramics with good dielectric properties and low sintering temperature. Barium strontium titanate, which can change the ratio of barium and strontium to meet the requirements, is also a kind of microwave dielectric ceramics. Therefore, many researchers focus on the preparation and application of hexagonal zinc titanate and barium strontium titanate in the field of functional materials. In this paper, hexagonal zinc titanate was prepared by solid state reaction and sol-gel method. Zinc magnesium titanate, which has a better thermal stability, was prepared by substituting a part of zinc with magnesium. Finally, barium strontium was prepared by molten salt method. All the samples were characterized by XRD、TGA/SDTA、FTIR and SEM. Moreover, the influences of several factors on the preparation of these materials were investigated. In the end, we studied the sintering behavior of the as-prepared titanate powders.In current work, hexagonal zinc titanate was prepared by solid state reaction and some factors on the preparation were investigated. High purity hexagonal zinc titanate was prepared by calcining the samples at800℃for3h with zinc nitrate as zinc sources, and the sintering behavior of the as-prepared hexagonal zinc titanate was studied at900℃.Hexagonal zinc titanate was prepared by sol-gel method. The results indicate that hexagonal zinc titanate can be prepared in a relativity wide temperature range with titanium trichloride or butyl titanate as Ti source. The final crystal phase is influenced not only by calcination temperature but also by calcination time when butyl titanate is used as Ti source. Cubic zinc titanate generated at low temperature can transform into hexagonal zinc titanate at high temperature. Moreover, the as-prepared hexagonal zinc titanate shows certain sintering ability at900℃.In the last chapter, some doped titanate materials were studied. Zinc magnesium titanate was prepared by sol-gel method, and barium strontium titanate was prepared by molten salt method and solid state reaction method. The results indicate that barium strontium titanate prepared by molten salt method has a better dispersibility. The as-prepared zinc magnesium and barium strontium titanate show certain sintering ability at900℃.