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[bagher_193@yahoo.co.uk]

Dear ABINIT user 
When I calculate the optimal lattice parameter of MgAl2O4. The final results 
are:
acell1=1.261705782E00Bohr
acell2=1.2619705475E00Bohr
However, I can not figure out this number compare to input 
acell=15.231199Bohr for MgAl2O4.
I wonder, if possible, could someone let me know what is the problem, I 
appreciated for your reply
Best Wishes
Bagher
 
The input file is as followers:

ndtset 2
optcell 1
ionmov  3
ntime  10
dilatmx 2.0
ecutsm  0.5
kptopt 1         
nshiftk 4
shiftk  0.5 0.5 0.5  
        0.5 0.0 0.0
        0.0 0.5 0.0
        0.0 0.0 0.5
ngkpt1  2 2 2  
getwfk -1         
spgroup 227
brvltt -1
acell 3*15.231199     
ntypat 3          
znucl 12 13 8     
natom 14           
natrd 3
typat 1*1 1*2 1*3                 
xred              
 0.1250  0.1250  0.1250  #Mg
 0.8750  0.8750  0.8750  #Mg
 0.5000  0.5000  0.5000  #Al 
 0.5000  0.7500  0.7500  #Al
 0.7500  0.7500  0.5000  #Al
 0.7500  0.5000  0.7500  #Al
 0.2632  0.2632  0.2632  #O
 0.7367  0.7367  0.7367  #O
 0.7367  0.5132  0.5132  #O
 0.2632  0.9867  0.9867  #O
 0.9867  0.9867  0.2632  #O
 0.5132  0.5132  0.7367  #O
 0.5132  0.7367  0.5132  #O
 0.9867  0.2632  0.9867  #O
ecut  30.0         
nstep 40          
toldfe 1.0d-6      
diemac 12.0