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发表于 2021-11-17 20:44:51
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+-------------------------- Summary ----------------------------+
Crystal Class: -3
Space Group: R-3
Crystal System: Trigonal/Rhombohedral II system
Including Point group classes: 3, -3.
There are 7 independent elastic constants
C11 C12 C13 C14 -C15 0
C12 C11 C13 -C14 C15 0
C13 C13 C33 0 0 0
C14 -C14 0 C44 0 -C15
C15 -C15 0 0 C44 C14
0 0 0 -C15 C14 C66
Stiffness Tensor C_ij (in GPa):
58.621 16.459 20.296 -0.326 -12.553 0.000
16.459 58.621 20.296 0.326 12.553 0.000
20.296 20.296 86.873 0.000 0.000 0.000
-0.326 0.326 0.000 17.428 0.000 12.553
-12.553 12.553 0.000 0.000 17.428 -0.326
0.000 0.000 0.000 12.553 -0.326 21.081
根据文献六方晶体的独立弹性常数有5个,C11 C33 C44 C12 C13。(PRB,76,054115,2007)
VASPKIT给出的独立弹性常数7个。
不知道问题出在那个地方? 非常感谢!
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