| Popis: |
For the first time, ceramic solid solutions of (1-x )SrTiO3 -x BiScO3 system with x = 0, 0.05, 0.1, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45 and 0.5 have been synthesized via solid-state processing techniques. End compounds of this system are not ferroelectric materials. The XRD analysis revealed that, at room temperature, all compositions under study (excepting pure SrTiO3 ) consist of mixture of the center-symmetric cubic Pm 3m phase and the polar tetragonal P 4mm phase. The EBSD mapping has applied to image two-phase structure. It was found that fraction of the cubic phase decreases and fraction of the tetragonal phase increases when x arises. Anomalous behavior of dielectric permittivity and dielectric losses have been found for these samples which are specific for ferroelectrics with diffuse phase transition. |
