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zhangmse

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[交流] 【求助】表面能计算不准确的问题

本人用abinit计算了al(100)面的表面能,结果和实验数据以及别人的计算都很好。用的是GGA-PBE算的 。
但是在计算TiC(1 0 0)面得时候用PAW方法算的,但是和别人算的相差很大啊,大约差了16%,请问为什么啊?下面是我的输入文件,,请大侠帮忙看看,感激不尽啊,,快郁闷死我了,,谢谢啊!!!!!1
occopt 5
tsmear 0.04
chkprim 0
nband 80
getwfk -1
kptopt 1         
ngkpt 15 15 1
nshiftk 1
shiftk 0.5 0.5 0.5
acell 3*1 angstrom  
rprim   3.060358197528548       0.000000000000000       0.000000000000000
       0.000000000000000       3.060358197528547       0.000000000000000
       0.000000000000000       0.000000000000000      18.656000137329102
ntypat 2        
znucl 6 22      
natom 10      
typat 1 1 1 1 1 2 2 2 2 2      
xred           
   0.0000000000000000   0.9999999999999999   0.1159948551888297
     0.0000000000000000   0.9999999999999999   0.3479845655664890
     0.4999999999999999   0.4999999999999999   0.0000000000000000
    0.4999999999999999   0.4999999999999999   0.2319897103776593
     0.4999999999999999   0.4999999999999999   0.4639794207553186
    0.0000000000000000   0.0000000000000000   0.0000000000000000
    0.0000000000000000   0.0000000000000000   0.2319897103776593
    0.0000000000000000   0.0000000000000000   0.4639794207553186
    0.4999999999999999   0.4999999999999999   0.1159948551888297
    0.4999999999999999   0.4999999999999999   0.3479845655664890
#Definition of the planewave basis set
ecut  15.0         # Maximal kinetic energy cut-off, in Hartree
ionmov 2
tolmxf 5.0d-5
ntime 20
#Definition of the SCF procedure
nstep 100          # Maximal number of SCF cycles
toldfe 1.0d-6   
pawecutdg 25
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