[Wien] optimised volume too large

[Chandrika]

Hello ,
In continuation of some queries on optimised volumes being too different, I want to add that I am facing the same problem. I wrote about this some time back but received no response. Could someone please help.
When I optimised the volume of Si (cubic) with the known (experimental) value a =b = c= 5.4307, space gp 227 Fd3m and RMT 1.76, I get the optimised lowest energy value at vol +118%. My cell a, b, c has increased to 7.05 Ang!
What inputs need to be changed to obtain better volumes?
Thanks in advance
Chandrika
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