[Pw_forum] Not convergence of the scf in phonon calculation

[李晓川]

dear all
       when I computed the scf of phonon,the convergnece is always not 
attained,I tried changing the "tr2_ph" and "alpha_mixing" to accelarate the 
speed of convergnece ,But the results is not ideal.So i want to know what can i 
do to perform the convergence of phonon.e.g.which parameters can be changed ?
 
     
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