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txf8378金蟲 (小有名氣)
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[求助]
vasp 算的born有效電荷和Phonopy中BORN文件的疑問
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用vasp5.2算的 BORN EFFECTIVE CHARGES,但不知道怎么用于算TO-LO分裂,我算的結(jié)構(gòu)是UO2 vasp 計(jì)算結(jié)果如下: BORN EFFECTIVE CHARGES (in e, cummulative output) ------------------------------------------------- ion 1 1 -1.83646 0.00000 0.00000 2 0.00000 -1.83538 0.00000 3 0.00000 0.00000 -1.83746 ... ion 39 1 0.97993 0.00000 0.00000 2 0.00000 0.97943 0.00000 3 0.00000 0.00000 0.98051 不明白的地方是:第一個(gè)是U離子,為什么born有效電荷是負(fù)的,而第39個(gè)離子(O離子)是正的? 另外,Phonopy中BORN輸入說明為: In the first line, the first value is the unit conversion factor. For VASP, it may be 27.2116 × 0.52918. In the second line, dielectric constant is specifed in Cartesian coordinates. The nine values correspond to the tensor elements of xx, xy, xz, yx, yy, yz, zx, zy, and zz. From the third line, Born effective charges Z for the independent atoms in the primitive cell have to be written in Cartesian coordinates. EXAMPLE:14.400 0.25 2.00 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.00 1.98 0.00 0.00 0.00 1.98 0.00 0.00 0.00 1.98 -0.99 0.00 0.00 0.00 -0.99 0.00 0.00 0.00 -0.99 不知道這個(gè)27.2116 × 0.52918是怎么來的?請大家討論一下 [ Last edited by txf8378 on 2011-4-19 at 20:00 ] |
木蟲 (初入文壇)
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