Pyroelectric properties of the triglycine sulphate crystal formerly influenced by a transverse electric field

Abstract

Measurements of the hysteresis loop and pyroelectric current density have been carried out. It has been shown that the function describing the remanent polarization decay over time generated by a prolonged transverse electric field is for TGS qualitatively the same as for other uniaxial ferroelectrics (TGSe, Rochelle salt), regardless of the fact that different electrode-sample systems were used. A prolonged application of an electric potential V s at temperature T = T A < T C (T C is the critical temperature of the paraelectric-ferroelectric phase transition) to a side ring electrode of a round plate sample changes pyroelectric properties of TGS and leads to the memory effect. For T < T A , the polarization P values obtained by time integration of electric current density measured after V s disconnection differ from those measured before V s application by a constant value, and therefore, the first derivative ∂P/∂T remains unchanged provided that the temperature T A is not exceeded.