Pyroelectric hysteresis loop at ferroelectric phase transition

Abstract

A theory of a nonlinear pyroelectric effect in a phase transition region of a ferroelectric thin film due to harmonic temperature changes with large amplitudes reaching tens of K has been developed. Polarization during the temperature cycle-pyroelectric hysteresis loop is obtained at various frequencies, amplitudes, thermal, and electric relaxation times. It is proved that ferroelectric film can be maintained in a monodomain state during the cycle. Applicability of a nonlinear pyroelectric cycle to solar energy conversion (ferroelectric solar cell) is discussed. © 1999 American Institute of Physics.