Crystallization behavior, microstructure and dielectric properties of lead titanate glass ceramics in the presence of Bi_2O_3 as a nucleating agent

摘要

The crystallization behavior of PbO-TiO_2-B_2O_3-SiO_2 glasses in the presence of Bi_2O_3 as a nucleating agent were studied utilizing XRD, DTA, SEM. The glass samples heat treated in the range of 557-630 °C for different soaking times, all developed PbTiO_3 (FT) with perovskite structure. It was found that the addition of 0.5-1.0 mol% Bi_2O_3 resulted in the formation of homogenous, nano-structured glass ceramics with a mean crystallite size of 20-25 nm and PbTiO_3 as the major crystalline phase. The dielectric constant and dissipation factors for the prepared glass ceramics were in approx 140-400 and approx 0.04-0.4 ranges respectively.