<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><div id="yiv1292387161">I am new to PWscf and working on bismuth titanate. I have made the following input file and visualized the structure in xcrysden. But it is not the same as given in M.-Q.. Cai et al Chemical Physics Letters 399 (2004) 89-93 though I have used the same coordinates as that given in the above paper. Please help or give some suggestions.<br>Neel<br><br> &control<br> calculation='scf',<br> restart_mode='from_scratch',<br> prefix='bit'<br> pseudo_dir = '/home/physics/pseudo/',<br> outdir='/home/physics/work/bit/temp'<br> /<br> &system<br> ibrav = 7, celldm(1) =7.733,celldm(3)=8.611, nat= 9, ntyp= 3,<br> ecutwfc = 20.0,ecutrho=100,<br> occupations='smearing',
smearing = "methfessel-paxton",degauss=0.05,<br> <br> /<br> &electrons<br> mixing_beta = 0.50<br> conv_thr = 1.0e-6<br>/<br> &ions<br> /<br><br>ATOMIC_SPECIES<br> Bi 208.327 Bi.pbe-d-mt.UPF<br> Ti 47.867 Ti.pbe-sp-van_ak.UPF<br> O 15.9994 O.pbe-van_ak.UPF<br>ATOMIC_POSITIONS {crystal}<br> Bi 0.500 0.500 0.06752<br> Bi 0.500 0.500 0.21147<br> Ti 0.500 0.500 0.500<br> Ti 0.500 0.500 0.37074<br> O 0.500 0.000 0.000<br>
O 0.500 0.000 0.250<br> O 0.500 0.500 0.4411<br> O 0.500 0.500 0.31830<br> O 0.500 0.000 0.11768<br>K_POINTS {automatic}<br>2 2 1 0 0 0<br></div></td></tr></table><br>
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