Influence of Compressive Stress on Dielectric and Ferroelectric Properties of the (Na sub(0.5)Bi sub(0.5)) sub(0.7)Sr sub(0.3)TiO sub(3) Ceramics

Good quality lead-free ceramics of (Na sub(0.5)Bi sub(0.5)) sub(0.7)Sr sub(0.3)TiO sub(3)(NBTS30) have been produced by a solid phase sintering process. The dependence of dielectric and ferroelectric properties on the unaxial pressure (0-1200 bar) were investigated. A shift and decrease of maximum value of epsilon , decrease of the thermal hysteresis and coercive field and increase of polarization with increasing pressure were observed. The results were discussed in terms of an elastic changes in inter-ionic distances in a crystal structure and switching nanoregions under the action of pressure. The NBTS30 ceramic is expected to be a new promising candidate for lead-free electronic material.