Phase evolution, microstructure, electric properties of (Ba1-xBi0.67xNa0.33x)(Ti1-xBi0.33xSn0.67x)O3 ceramics

(Ba1-xBi0.67xNa0.33x)(Ti1-xBi0.33xSn0.67x)O-3 (abbreviated as BBNTBS, 0.02 <= x <= 0.12) ceramics were fabricated via a traditional solid state reaction method. The phase transition of BBNTBS from tetragonal to pseudo cubic is demonstrated by XRD and Raman spectra. The BBNTBS (x = 0.1) ceramics have decent properties with a high epsilon(r) (similar to 2250), small Delta epsilon/epsilon(25 degrees C) values of +/- 15% over a wide temperature range from -58 to 171 degrees C, and low tan delta <= 0.02 from 10 to 200 degrees C. The basic mechanisms of conduction and relaxation processes in the high temperature region were thermal activation, and oxygen vacancies might be the ionic charge transport carriers. Meanwhile, BBNTBS (x = 0.1) exhibited decent energy storage density (J(d) = 0.58 J/cm(3)) and excellent thermal stability (the variation of J(d) is less than 3% in the temperature range of 25-120 degrees C), which could be a potential candidate for high energy density capacitors.