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hwceng0816

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[求助] 六方晶系怎么会出现这样的弹性常数?真得不解呀。

我对镁建立了一个超胞,然后替换一个原子为其他元素进行弹性常数计算,怎么会出现这样的结果,根本就不符合六方密排结构的弹性常数的格式。高人指点一下,下面有图。

  ============================
  Summary of elastic constants
  ============================

id  i  j       Cij (GPa)
1   1  1      69.08990 +/-   0.736
2   2  2      81.34165 +/-   1.343
3   3  3     150.22675 +/-  46.937
4   4  4      16.86205 +/-   0.079
5   5  5       7.11315 +/-   0.187
6   6  6      36.89285 +/-   0.171
7   1  2      22.87758 +/-   0.419
8   1  3      -3.73305 +/-   1.005
9   1  4      -3.92637 +/-   0.298
10   1  5      -8.25015 +/-   0.442
11   1  6       4.45775 +/-   0.350
12   2  3       3.99698 +/-   3.959
13   2  4       2.66975 +/-   0.295
14   2  5       4.40060 +/-   0.257
15   2  6      -5.96098 +/-   0.189
16   3  4       6.35080 +/-   0.770
17   3  5       8.78630 +/-   1.297
18   3  6      -3.62487 +/-   0.351
19   4  5      -4.67952 +/-   0.098
20   4  6       5.76605 +/-   0.146
21   5  6       2.37643 +/-   0.237

      =====================================
      Elastic Stiffness Constants Cij (GPa)
      =====================================

    69.08990    22.87758    -3.73305    -3.92637    -8.25015     4.45775
    22.87758    81.34165     3.99698     2.66975     4.40060    -5.96098
    -3.73305     3.99698   150.22675     6.35080     8.78630    -3.62487
    -3.92637     2.66975     6.35080    16.86205    -4.67952     5.76605
    -8.25015     4.40060     8.78630    -4.67952     7.11315     2.37643
     4.45775    -5.96098    -3.62487     5.76605     2.37643    36.89285

      ========================================
      Elastic Compliance Constants Sij (1/GPa)
      ========================================

   0.0383356  -0.0198610  -0.0077865   0.0536832   0.1097247  -0.0240643
  -0.0198610   0.0241552   0.0052174  -0.0370849  -0.0746406   0.0174193
  -0.0077865   0.0052174   0.0097836  -0.0205656  -0.0407410   0.0085837
   0.0536832  -0.0370849  -0.0205656   0.1724205   0.2431193  -0.0571074
   0.1097247  -0.0746406  -0.0407410   0.2431193   0.5588061  -0.1033137
  -0.0240643   0.0174193   0.0085837  -0.0571074  -0.1033137   0.0492514

Bulk modulus    =    36.47748 +/-  2.500 (GPa)
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