[Wien] structure-optimization

[Seyyed Amir Abbas Emami]

​dear users
 
I am trying to optimize structural properties of an alloy which is doped. This compound has 4 free parameters ( one lattice parameter + three internal free parameter). Now how can i find best optimize state for these parameter. Is there any method to simultaneously optimized energy in terms of these free parameters. 

thank you in advance 
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