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Ionicity scale based on the centers of maximally localized Wannier functions

机译:基于最大局部Wannier函数中心的离子量表

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摘要

The maximally localized Wannier functions (MLWFs) of 32 A~NB~(8-N) compounds, ranging from elemental group-Ⅳ solids to Ⅰ-Ⅶ compounds, have been constructed according to the method of Marzari and Vanderbilt [Phys. Rev. B 56, 12847 (1997)]. The considered systems crystallize in the diamond, zinc-blende, or rocksalt structures. A different bond ionicity scale has been introduced based on the deviation of the centers of the MLWFs from the corresponding bond centers, which involves only physical constants. The present bond ionicity of the considered compounds can be considered, to a very good approximation, as the best fit to the previous empirical and self-consistent ionicity scales. The critical value of the bond ionicity that separates the fourfold and sixfold coordinate structures is found to be of about 0.7, which is smaller than previous theoretical values of about 0.8. The volume variation of the bond ionicity is found to be much smaller than previously thought, except for SiC.
机译:根据Marzari和Vanderbilt的方法[Phys.Med.Chem.Soc。,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,、,、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、,、、、、、、、、、、、、,、,、,、,、,、,、,,、 Rev.B 56,12847(1997)]。所考虑的系统在金刚石,闪锌矿或岩盐结构中结晶。已基于MLWF中心与相应键中心的偏差引入了不同的键离子性尺度,该偏差仅涉及物理常数。可以很好地近似地考虑所考虑化合物的当前键离子性,以使其最适合先前的经验和自洽离子性标度。发现分开四重和六重坐标结构的键离子性的临界值为约0.7,小于先前的约0.8的理论值。发现除了SiC以外,键离子性的体积变化比以前认为的小得多。

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