ABINIT Discussion Forums

Hi

i am new to abinit. I have problem in structural optimization like this:
chkprimit : ERROR -
According to the symmetry finder, the unit cell is
NOT primitive. The multiplicity is 4 .
The use of non-primitive unit cells is allowed
only when the input variable chkprim is 0.
Action : either change your unit cell (rprim or angdeg),
or set chkprim to 0.

The Unit cell is Cubic with space group No: 225
How can i overcome this problem? Please any one give me suggestions and solutions to this problem or please provide the some structural optimization Input file.

My Input file as follows:
#optimization of the lattice parameters
optcell 0
ionmov 3
dilatmx 1.05
ecutsm 0.5


#Definition of the unit cell in Bohr
acell 5.1439 5.1439 5.1439 angstrom
angdeg 90 90 90

#Definition of the atoms
ntypat 2
znucl 63 8
natrd 2
spgroup 225
brvltt 3
natom 8
typat 1 2
tolmxf 5.0d-4
xred 0.0 0.0 0.0
0.5 0.5 0.5

#Definition of the planewave basis set
ecut 30.0

#Definition of the k-point grid
kptopt 1
nshiftk 1
shiftk 0 0 0
ntime 1000
ngkpt 4 4 4
getwfk -1

#Definition of the SCF procedure

nstep 1000
toldfe 1.0d-6

Thanks
C.Kanagaraj