Production of high quality Zr+4 doped BaTiO3 ceramics

BaTiO3 have been the most promising material which is used both dielectric and piezeoelectric applications for many years. Currently lead based materials, after their lifetimes, are harmful for nature and when the nature friendly characteristics of BaTiO3 considered, its importance is increasing day by day. After these developments, new processes need to be developed to increase the electrical properties of BaTiO3 ceramics. BaTiO3 powders used in the electronic industry should have a low particle size (<400 nm), high purity (>%99) and tetragonality ratio higher than 1.008. BaTiO3 powder with desired quality can be produced by solid state method which is the most suitable synthesis method because it's both easy to manufacture and suitable for industrial production. The scientific purpose of this study is first, the understanding of process parameters effects (starting powder, time, temperature et.) on the powder properties in solid state method and the producing of oriented ceramics with Templated Grain Growth Method. The technological purpose of the work is to producing of Zr+4 doped BaTiO3 with the BaCO3, which was synthesized from native barite ore, and then producing of ceramics from these powders. In this context, two different BaCO3 sources have been used for synthesis of BaTiO3. Tetragonality of BaTiO3 powders were increased with increasing calcination temperature. It has also observed that the addition of Zr+4 to BT system has change the BT crystal structure from tetragonal to orthorhombic. The Lotgering Factors of BT and BZT ceramics obtained with Templated Grain Growth Method are 0.97 and 0.8, respectively. The dielectric constant value of the produced ceramics was measured as 2580 at room temperature.