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Modeling of glycine polymorphic and switching properties

机译:甘氨酸多态性和转换特性的建模

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摘要

Main results of the modeling and computational studies of two the most interesting non-centro-symmetric polymorphic glycine structures: β-glycine (space group P21) and γ-glycine (space group P32), are presented in this work. These structures reveal piezoelectric and polar properties. But the value of polarization is not clear as well it's switching behaviour. In this work computational modelling of both glycine polymorphic crystal structures were performed using combined method with Local Density Approximation (LDA) first principle calculations of atomic optimized crystal structures on Linux cluster and with molecular semi-empirical PM3 calculations by HyperChem 8.0 This computational study is corroborated by measured nanoscale data obtained by atomic force and piezo-response force microscopy (AFM / PFM).
机译:这项工作提出了两种最有趣的非中心对称多态甘氨酸结构的建模和计算研究的主要结果:β-甘氨酸(空间群P21)和γ-甘氨酸(空间群P32)。这些结构显示出压电和极性特性。但是极化的值也不清楚,这是开关行为。在这项工作中,两个甘氨酸多晶型晶体结构的计算模型是使用结合方法进行的,该方法与Linux簇上原子优化晶体结构的局部密度近似(LDA)第一原理计算以及HyperChem 8.0的分子半经验PM3计算相结合。该计算研究得到了证实。通过原子力和压电响应力显微镜(AFM / PFM)获得的测量的纳米级数据。

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