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horson金蟲 (小有名氣)
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[求助]
VASP識(shí)別對(duì)稱性的能力如何?
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據(jù)說VASP對(duì)晶體的對(duì)稱性識(shí)別能力不好,并且只能粗略地識(shí)別點(diǎn)群而非空間群,不知是否如此? 我編輯了一個(gè)方解石的POSCAR文件,從OUTCAR文件來看VASP連點(diǎn)群都沒有識(shí)別對(duì)。不知是不是我的理解有問題,請大伙幫我看看: POSCAR文件(附件中有源文件): Ca C O (Hexagonal Calcite) 1.0 4.3211203770054700 -2.4948000771893200 0.0000000000000000 0.0000000000000000 4.9896000000000000 0.0000000000000000 0.0000000000000000 0.0000000000000000 17.0610000000000000 6 6 18 Direct 0 0 0 0.6667 0.3333 0.3333 0.3333 0.6667 0.6667 0 0 0.5 0.6667 0.3333 0.8333 0.3333 0.6667 0.1667 0 0 0.25 0.6667 0.3333 0.5833 0.3333 0.6667 0.9167 0 0 0.75 0.6667 0.3333 0.0833 0.3333 0.6667 0.4167 0.2768 0 0.25 0 0.2768 0.25 0.7232 0.7232 0.25 0.6667 0.6101 0.5833 0.0565 0.3898 0.9167 0.3899 0.0565 0.5833 0.6101 0.6667 0.9167 0.9435 0.3333 0.5833 0.3333 0.9435 0.9167 0.2768 0.2768 0.75 0 0.7232 0.75 0.7232 0 0.75 0.6667 0.0565 0.0833 0.0565 0.6667 0.4167 0.3899 0.3333 0.0833 0.6101 0.9435 0.4167 0.9435 0.6101 0.0833 0.3333 0.3899 0.4167 OUTCAR的相關(guān)輸出: LATTYP: Found a hexagonal cell. ALAT = 4.9895999807 C/A-ratio = 3.4193121825 Lattice vectors: A1 = ( 4.3211203770, -2.4948000772, 0.0000000000) A2 = ( 0.0000000000, 4.9896000000, 0.0000000000) A3 = ( 0.0000000000, 0.0000000000, 17.0610000000) Subroutine PRICEL returns: Original cell was already a primitive cell. Analysis of symmetry for initial positions (statically): Routine SETGRP: Setting up the symmetry group for a hexagonal supercell. Subroutine GETGRP returns: Found 1 space group operations (whereof 1 operations were pure point group operations) out of a pool of 24 trial point group operations. The static configuration has the point symmetry C_1 . Analysis of symmetry for dynamics (positions and initial velocities): Subroutine DYNSYM returns: Found 1 space group operations (whereof 1 operations were pure point group operations) out of a pool of 1 trial space group operations (whereof 1 operations were pure point group operations) and found also 1 'primitive' translations The dynamic configuration has the point symmetry C_1 . |
金蟲 (小有名氣)
榮譽(yù)版主 (著名寫手)
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"VASP includes a full featured symmetry code which determines the symmetry of arbitrary configurations automatically." 應(yīng)該來說,其識(shí)別能力還是很強(qiáng)的。 問題在0.3333和0.6667上,至少精確到6位。如0.333333、0.666667這樣才能識(shí)別出1/3和2/3。 VASP中實(shí)際上是由SYMPREC這個(gè)參數(shù)來控制的,默認(rèn)值10^−5。建議閱讀手冊“6.27 ISYM-tag and SYMPREC-tag” |
金蟲 (小有名氣)
送鮮花一朵 |
謝謝!POSCAR文件修改為如下,仍然識(shí)別為C_1,不知為何? Ca C O (Hexagonal Calcite) 1.0 4.3211203770054700 -2.4948000771893200 0.0000000000000000 0.0000000000000000 4.9896000000000000 0.0000000000000000 0.0000000000000000 0.0000000000000000 17.0610000000000000 6 6 18 Direct 0 0 0 0.666667 0.333333 0.333333 0.333333 0.666667 0.666667 0 0 0.5 0.666667 0.333333 0.833333 0.333333 0.666667 0.166667 0 0 0.25 0.666667 0.333333 0.583333 0.333333 0.666667 0.916667 0 0 0.75 0.666667 0.333333 0.083333 0.333333 0.666667 0.416667 0.2768 0 0.25 0 0.2768 0.25 0.7232 0.7232 0.25 0.666667 0.6101 0.583333 0.0565 0.3898 0.916667 0.3899 0.0565 0.583333 0.6101 0.666667 0.916667 0.9435 0.333333 0.583333 0.333333 0.9435 0.916667 0.2768 0.2768 0.75 0 0.7232 0.75 0.7232 0 0.75 0.666667 0.0565 0.083333 0.0565 0.666667 0.416667 0.3899 0.333333 0.083333 0.6101 0.9435 0.416667 0.9435 0.6101 0.083333 0.333333 0.3899 0.416667 |
禁蟲 (正式寫手)
隱清堂主
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