[xcrysden] Anatase primitive cell: Regarding
Suresh A
suresh2007pgp19 at gmail.com
Sat Jan 16 07:48:44 CET 2016
Dear Friends,
I have prepared primitive cell input file for quantum
espresso.I have included those files below. The problem is XCRYSDEN shows
two different structure for a same file where one is in crystal coordinates
and other one in angstrom.
Inputfile number 1: This file shows correct strucutre in XCRYSDEN
&CONTROL
title = 'TiO2' ,
calculation = 'scf',
outdir ='$TMP_DIR/'
prefix = 'anatase',
pseudo_dir = '$PSEUDO_DIR/',
/
&SYSTEM
ibrav = 7,
celldm(1) = 7.1356,
celldm(3) = 2.51218,
nat = 6 ,
ntyp = 2 ,
ecutwfc = 30.0000000000 ,
ecutrho = 300,
/
&ELECTRONS
conv_thr = 1.0d-09,
/
ATOMIC_SPECIES
O 15.999 O.pw91-van_ak.UPF
Ti 47.867 Ti.pw91-nsp-van.UPF
ATOMIC_POSITIONS angstrom
Ti 0.000000000 0.000000000 0.000000000
Ti 0.000000000 1.888000000 2.371500000
O 0.000000000 0.000000000 -1.983097630
O 0.000000000 0.000000000 1.983097630
O 0.000000000 1.888000000 0.387796645
O 0.000000000 1.888000000 4.355203355
K_POINTS automatic
4 4 4 0 0 0
*nputfile number 2: &CONTROL title = 'anatase'
, calculation = 'scf' , restart_mode =
'from_scratch' , pseudo_dir =
'/home/suresh/GN2/', outdir
='/home/suresh/Desktop/primitivecell/tmp/', prefix =
'anatase' , tstress = .true. ,
tprnfor = .true. ,
/ &SYSTEM ibrav = 7, celldm(1) =
7.153, celldm(3) = 2.513, nat =
6, ntyp = 2, ecutwfc = 60
, exxdiv_treatment = 'none' ,
/ &ELECTRONS / &IONS
/ &CELL /ATOMIC_SPECIES Ti
47.86700 Ti.pz-mt_fhi.UPF O 15.99940 O.pz-mt_fhi.UPFATOMIC_POSITIONS
(crystal)Ti 0.0000000 0.0000000 0.0000000Ti 0.0000000
0.5000000 0.2500000O 0.0000000 0.0000000 0.2080000O
0.0000000 0.0000000 -0.208000O 0.0000000 0.5000000
0.4580000O 0.0000000 0.5000000 -0.042000K_POINTS automatic 4 4 2 1
1 1*
*Will you please pointout where the problem i?*
With Regards,
A.Suresh,
Research Scholar,
Madurai Kamaraj University,
Madurai.
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