基于静态电滞回线的铁电电容模型

A model of ferroelectric capacitors based on hysteresis loop

根据铁电体的特征电滞回线和微观结构特点 ,将构成铁电体的晶胞等效为偶极子 .通过分析偶极子在电场作用下的极化反转机理 ,运用统计物理学基本原理建立了新的铁电电容模型 .该模型不仅适用于饱和极化的情况 ,对非饱和、电滞回线不对称以及输入电压中途转向等各种情况也都适用 .模型数学表达简洁 ,易于结合到实际的电路仿真软件中去 ,仿真结果与试验结果符合非常好 .

Based on the characteristic of ferroelectric microstructure, a crystal cell of ferroelectric is regarded as a dipole. Analysis of the switching property of dipole in the electric filed is made. According to the statistic principle, different distribution functions are used to fit the probability of dipole switching. A model based on hysteresis loop is developed. Experimental data on PZT show good agreement with the model for various loops, and the model is easily linked to simulative software of circuit for either memory or analog design application.