Reaearch on the Microscopic Mechanism of the Pyroelectric Properties of Temperature Gradient Ferroelectric Materials
Under the theoretical framework of mean field approximation,the extended transverse Ising model theory is adopted,a distribution function is introduced to describe the quantum fluctuation effect in the material and ferroelectric distortion caused by temperature gradient,and the micro mechanism that affects the pyroelectric prop-erties of temperature gradient ferroelectric materials is explored.Research has shown that the quantum fluctuation effect and ferroelectric distortion are two important factors affecting the pyroelectric properties of ferroelectric ma-terials.As the quantum fluctuation effect increases,the peak value of the pyroelectric coefficient gradually decreases,but it has no significant effect on the position of the peak value of the pyroelectric coefficient.Due to the presence of ferroelectric distortion,the peak value of the pyroelectric coefficient of the material is greatly increased,and the moment of phase transition in the first layer of temperature gradient ferroelectric materials is the most significant factor affecting the appearance of the peak of the pyroelectric coefficient of the material.
万方数据
维普
