梯度铁电薄膜热释电性质的理论研究

为了探讨提高铁电薄膜热释电性质的理论途径,建立组分梯度铁电薄膜的理论模型,在热力学唯像理论的框架下,引入一个分布函数描述组分梯度的特性,通过改变参数a、外电场的强度及方向等因素,重点研究了组分梯度铁电薄膜的热释电性质.研究表明:薄膜内各组分的梯度分布导致了极化强度的梯度分布;参数a和所施加外电场的情况是影响铁电薄膜性质的两个重要因素,对改变热释电材料的工作温区和探测灵敏度都有显著影响,该论文的研究为铁电薄膜热释电器件的制备及实际应用提供了理论参考依据.

Theoretical investigation on the pyroelectric properties of graded ferroelectric thin films

In order to investigate the theoretical method to improve the pyroelectric properties of ferroelectric thin films,a theoretical model for component-graded ferroelectric thin films is developed in this study.In the framework of the thermodynamic theory,a distribution function is introduced to characterize the properties of graded components.With the variation of parameter a and the external electric field,the pyroelectric properties of component-graded ferroelectric thin films are mainly investigated.The study shows that the component gradient leads to the graded-polarization distribution in films.The parameter a and the external electric field are two main factors affecting the films properties,which have obvious impact on pyroelectric working temperature region and pyroelectric detective insensitivity.The results provide a theoretical reference for the preparation and applications of pyroelectic apparatus.