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[求助]
arbitrary isotropic pressure和ambient pressure有啥區(qū)別嘞?
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arbitrary isotropic pressure和ambient pressure有啥區(qū)別嘞?感覺都是壓力! 如果使用VASP進(jìn)行模擬,又有啥不同呢?以往加載壓力就只是人為固定晶胞體積。 有其他不同的處理么? 關(guān)于這兩個(gè)壓力不同的說法出現(xiàn)在下面的文獻(xiàn)中,我貼出原文。 J. Phys.: Condens. Matter 14 (2002) 6989–7005 At present, ab initio calculations of elastic constants of crystals under ambient pressure are not a problem (see, e.g., [23–32]). However, the question of how to calculate elastic constants at arbitrary isotropic pressure requires special consideration. We managed to find only a few papers [33–36] concerning this problem. |


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