Preparation, sintering, and microstructures of strontium barium bismuth tantalate layered perovskite ceramics
Journal
Journal of Materials Science
Journal Volume
39
Journal Issue
9
Pages
3079-3083
Date Issued
2004
Author(s)
Abstract
The solid solutions of Ba-doped SrBi2Ta2O9 layered perovskite ceramic powders have been successfully prepared via a two-step process using BiTaO4 as a precursor. The lattice constants of the solid solutions monotonically increase with increasing barium-ion content. The sinterability of {Sr1-xBax)Bi 2Ta2O9 powders is significantly improved by increasing the barium-ion content. When the specimens with high barium-ion contents are sintered at 1100¢XC, they thermally decompose to form rod-like grains and the matrix expands, leading to a lower density. The addition of barium ions to SrBi2Ta2O9 also results in significant variation in the morphology of the sintered specimens and the occurrence of c-axis preferred orientation which is ascribed to the anisotropic growth of plate-like grains. The precise control of the barium-ion content as well as the sintering conditions is critical for obtaining densified barium-ion doped SrBi2Ta2O9 ceramics with a pure, layered perovskite structure. ? 2004 Kluwer Academic Publishers.
Type
journal article