Effect of uniaxial compressive pre-stress and temperature on the electromechanical behaviour of relaxor ferroelectric ceramics

Abstract

The electromechanical behaviour of 0.98(0.9Pb(Mgl/3Nb2/3)O3–0.1PbTiO3)–0.02BaTiO3 (PMN–PT–2BT) relaxor ferroelectric ceramic under uniaxial compressive pre-stress is observed at stress up to 100 MPa using a homebuilt compress meter in conjunction with a modified Sawyer–Tower circuit. The results reveal that the maximum polarisation (Pm) and the longitudinal strain (x33) decrease with increasing pre-stress levels. It is owing to the restriction of the ferroelectric domains under both electric field and compressive pre-stress. Meanwhile, it is also found that temperature has significant effect on the electromechanical behaviour of this relaxor ferroelectric ceramic. The Pm and the x33 decrease with increasing temperature, and it is mainly because of the temperature-induced relaxor ferroelectric-paraelectric phase transition.