Temperature- and electric field-dependence of polarization hysteresis for a [001]c poled PMN-PT single crystal.

The dynamic hysteresis scaling behaviors of a [001]_c poled Pb(Mg_1/3Nb_2/3)O₃-0.28PbTiO₃ (PMN-0.28PT) single crystal have been explored as a function of amplitude E₀ and frequency f of the external electric field in a temperature region from 298 K to 388 K. The various scaling properties for hysteresis parameters such as area <A>, coercive field E_c, saturation polarization P_s vs temperature T, amplitude E₀ and frequency f were characterized among different temperature region. It was discovered that temperature has a critical influence on the polarization dynamic hysteresis and phase transformation characteristics of the PMN-0.28PT single crystal, and especially it was noticed that the discrepancy of the scaling relation between ln<A> and lnE₀ in low-field and high-field ranges decreases with increasing temperature. Meanwhile, the slope k in the linear equation ln<A> = klnE₀ + b increases while intercept b decreases with T in the temperature region of rhombohedral or tetragonal phase. In addition, temperature has a significant effect on the exponent α in the power law <A>∝ f ^α and the appearance of peak value in the relation between ln<A> and lnf can be mainly contributed to the frequency dependence of E_c. [ABSTRACT FROM AUTHOR]