论文标题
应变对铁电AL1-XSCXN的应变效应的分析
A Landau-Devonshire Analysis of Strain Effects on Ferroelectric Al1-xScxN
论文作者
论文摘要
我们使用经典的Landau-Devonshire方法对最近发现的氮化物铁电材料进行了热力学分析。使用六边形母体相（6/mmm）的自由能密度函数确定具有wurtzite结构（6mm）的AL1-XSCXN的电扭曲和介电刚度系数，并基于介电刚度关系的一阶相变。该分析的结果表明，能量屏障的应变敏感性比这些新型的Wurtzite铁电磁体中的自发极化大的数量级要大，但与经典的钙钛矿相比，两者对菌株的敏感性较小。这些分析结果在此报告说明了在AL1-XSCXN膜中强制性菌株/应激的敏感性，并通过相位场模拟和相关方法实现了进一步的热力学分析。
We present a thermodynamic analysis of the recently discovered nitride ferroelectric materials using the classic Landau-Devonshire approach. The electrostrictive and dielectric stiffness coefficients of Al1-xScxN with wurtzite structure (6mm) are determined using a free energy density function assuming a hexagonal parent phase (6/mmm), with the first order phase transition based on the dielectric stiffness relationships. The results of this analysis show that the strain sensitivity of the energy barrier is one order of magnitude larger than that of the spontaneous polarization in these novel wurtzite ferroelectrics, yet both are less sensitive to strain compared to classic perovskite ferroelectrics. These analysis results reported here explain experimentally reported sensitivity of coercive field to elastic strain/stress in Al1-xScxN films, and would enable further thermodynamic analysis via phase field simulation and related methods.
