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gleerat木蟲 (正式寫手)
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[交流]
【求助】K點(diǎn)選擇問題
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如果讓系統(tǒng)自動(dòng)計(jì)算fft的數(shù)目:nr1,nr2,scf.out文件中會(huì)出現(xiàn)警告:warning: symmetry operation # 2 not allowed. fractional translation: -0.3333333 0.3333333 0.0000000 in crystal coordinates。所以需要將nr1,nr2設(shè)置為3的倍數(shù)。但并不是所有的3的倍數(shù)都可以運(yùn)行,很快會(huì)出現(xiàn):from set_fft_dim : error # 1;input nr1 value not allowed。所以必須進(jìn)行試驗(yàn)。(2010-05-04) 以上是下面這個(gè)地址上的東西。http://blog.sina.com.cn/s/blog_5f15ead20100cbbt.html 我的問題是,在我輸入的坐標(biāo)下(如下),應(yīng)該如何去選擇K點(diǎn)呢? Ca 0.0000000000000000 0.0000000000000000 0.0000000000000000 1 1 1 Ca 0.5000000000000000 0.5000000000000000 0.0000000000000000 1 1 1 Ca 0.5000000000000000 0.0000000000000000 0.5000000000000000 1 1 1 Ca 0.0000000000000000 0.5000000000000000 0.5000000000000000 1 1 1 Fe 0.2500000000000000 0.2500000000000000 0.2500000000000000 1 1 1 Fe 0.2500000000000000 0.2500000000000000 0.7500000000000000 1 1 1 As 0.0000000000000000 0.0000000000000000 0.3546700000000000 1 1 1 As 0.5000000000000000 0.5000000000000000 0.3546700000000000 1 1 1 As 0.0000000000000000 0.5000000000000000 0.1453300000000000 1 1 1 As 0.5000000000000000 0.0000000000000000 0.1453300000000000 1 1 1 As 0.0000000000000000 0.0000000000000000 0.6453300000000000 1 1 1 As 0.5000000000000000 0.5000000000000000 0.6453300000000000 1 1 1 As 0.0000000000000000 0.5000000000000000 0.8546700000000000 1 1 1 As 0.5000000000000000 0.0000000000000000 0.8546700000000000 1 1 1 如果都要是分母的倍數(shù),這個(gè)是不是不可能了? |

木蟲 (小有名氣)
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