Development of temperature-modulated measuring system of pyroelectricity in small single crystals and evaluation of pyroelectric coefficient using one-dimensional thermal model

Abstract

A temperature-modulated pyroelectricity measuring system adopting ac light irradiation as a heat source for temperature modulation is developed for measuring small single crystals of molecular ferroelectrics. Estimation of pyroelectric coefficient from the pyrocurrent requires the magnitude of temperature modulation during measurements. In this study, the temperature modulation is simulated based on a one-dimensional thermal diffusion model. The validity of the calculation is confirmed by a standard sample measurement performed for a single crystal of LiNbO₃.