Thermal history induced variable relaxor behavior in the high T_c ternary ferroelectric 0.6Bi(Mg_(1/2)Ti_(1/2))O3-0.05Bi(Zn_(1/2)Ti_(1/2))O_3-0.35PbTiO_3

摘要

Studies carried out on a perovskite-structured rhombohedral 0.6Bi(Mg_(1/2)Ti_(1/2))O3-0.05Bi(Zn_(1/2)Ti_(1/2))O_3-0.35PbTiO_3 (xBZT-yBMT-zPT) ceramic quenched from temperatures below 1000 °C show that the dielectric properties are dramatically altered by the thermal history. Samples quenched from temperatures 650 °C-900 °C show classical ferroelectric switching behavior that is not observed on either side of this temperature range. The quenched states lose their switchable ferroelectric properties when heated to temperatures as low as 400 °C. The results demonstrate for the first time that the dielectric and electromechanical response, as observed at room temperature, can be varied between normal to relaxor behavior by changing thermal quenching conditions.