[Wien] Calculating hardness - reg

[Murugan Sundareswari]

Dear Professor Blaha,

Please Clarify the following Doubts

There are range of Vicker's hardness formula for calculating the hardness
of the crystal system.
For example,
                (i)    Hv = ((1-2*σ*)E) / (6*(1+*σ*)), where
σ=(3B-2G)/(6B+2G)
                (ii)   Hv = (2*(K^2*G)^0.585)-3, where K=G/B and
                (iii)  Hv = (0.92*K^1.137*G^0.708), where K=G/B
If we proceed with these hardness formula we are getting different hardness
value. Please guide us that which is the best Vicker's hardness formula for
calculating the hardness of the cubic crystal system.
                                             Thanking you.
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