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茶味果冻

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[求助] pwscf做半导体晶胞结构优化

我建立的是半导体超晶胞模型,表面有一个团簇模型吸附,想先做结构优化再进行其他计算,in文件如下:
&CONTROL
calculation= "vc-relax",
restart_mode='from_scratch'
prefix= "cds",
pseudo_dir= "/vol6/home/zhang00/pseudo1",
outdir= "./",
tprnfor =.true,
nstep =50,
etot_conv_thr =1.0E-6,
forc_conv_thr =1.0D-5,
dt =50,
/
&SYSTEM
ibrav=0,celldm(1)=7.552000,nat=52,ntyp=4,
ecutwfc=40,ecutrho=400,
occupations ='smearing',
smearing ='mp',
degauss =0.025,
/
&ELECTRONS
conv_thr= 1.D-6,
mixing_beta= 0.7D0,
/
&IONS
/
&CELL
cell_dynamics ='bfgs'
/
ATOMIC_SPECIES
O  16.00  O.pbe-n-rrkjus_psl.0.1.UPF
S  32.00  S.pbe-n-rrkjus_psl.0.1.UPF
Ti 48.00  Ti.pbe-sp-van_ak.UPF
Cd 112.40 Cd.pbe-n-van.UPF
ATOMIC_POSITIONS crystal
O 0.000000 0.000000 0.000000
O 0.250000 0.250000 0.264805
。。。。。这里省略其它的
K_POINTS automatic
3 3 2 0 0 0
CELL_PARAMETERS
7.5520000 0.0000000 0.0000000
0.0000000 7.5520000 0.0000000
0.0000000 0.0000000 17.9113240
之后提交服务器任务,计算输出结果如下:
Initial potential from superposition of free atoms
     Check: negative starting charge=   -0.185650

     starting charge  403.99853, renormalised to  420.00000

     negative rho (up, down):  0.193E+00 0.000E+00
yhrun: error: cn2411: task 0: Killed
yhrun: First task exited 60s ago
yhrun: tasks 1-5: running
yhrun: task 0: exited abnormally
yhrun: Terminating job step 747818.0
slurmd[cn2411]: *** STEP 747818.0 KILLED AT 2014-11-04T17:03:06 WITH SIGNAL 9 ***
yhrun: Job step aborted: Waiting up to 2 seconds for job step to finish.
slurmd[cn2411]: *** STEP 747818.0 KILLED AT 2014-11-04T17:03:06 WITH SIGNAL 9 ***

前面读取信息都没有问题啊,到这里开始进行计算,任务直接就killed的,求高人帮看看是什么问题啊,赝势文献选择?k-point设置?还是截断能? 还是其它值设定问题?
还有occupations这一项,我的是半导体,这个值该选择什么呢?smearing不是针对金属么?tetrahedra这个只说适合计算DOS啊?做结构优化计算,对于原子间力,离子力,压力这些都必须要进行计算么?收敛值的选择该怎么确定呢?
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