Effect of strain on the hysteresis loop of PbTiO3 nanoporous

Abstract

Spontaneous polarisation of ferroelectric materials has been widely applied in electronic components such as random
access memory, sensor, and transducer. Among ferroelectric materials, PbTiO₃ (PTO) is one of the dominant materials
because it has a large spontaneous polarisation value and can operate stably at high temperatures. PTO has been studied in many different structures such as thin film, nanowire, nanodot, nanodisk, and nanotube. In order to clarify the strain effect on the hysteresis loop of PTO nanoporous, the author investigated the effect of mechanical deformation on porous structure PTO materials using calculations based on the core-shell model. The obtained results show that the hysteresis loop is expanded under the compression of the biaxial strain (x, y) and the tensile of the uniaxial strain (z). On the contrary, the loop is shrunk under the tensile of biaxial strain (x, y) and the compression of uniaxial strain (z). Besides, in the study, spontaneous polarisation distribution and regression function of hysteresis loop area - strain of PbTiO₃ nanoporous is discussed as well.