[Wien] correctness of elastic constants

[Subhra Kulshrestha]

Respected Prof. Blaha and Dear Wien users,
 
There is confusion related to elastic constant of cubic crystals in the published literature.  Kindly see the attached file where equations with (*) and (**) have been written differently by different workers.  Few of them wrote 3 ( Bouhemaou et al. Computational Materials Science 45(2009)474.  Bouhemaou et al. Computational Materials Science 38(2006)263.
Bouhemaou et al.  theochem 777(2006)5.) while others used 6 ( M. B.Kanoun Solids State electronics (2004) and Z. Charifi . JPCM 17 (2005) 4083) in equatin (*).  In the same way, in equation (**) some have used 1/3 and some other have used 1/6.
 
Kindly guide us about the correctness of the terms.
 
with kind regards and thanks,
 
Subhra Kulshrestha

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