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北京石油化工学院2026年研究生招生接收调剂公告
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[交流] 【求助】单斜结构的对称性

我计算一个单斜结构,原胞28个原子,symmetry operation应该是4个,现在总是2个,不知怎么回事,请高手们指教。
下面是输入卡:

&control
    calculation='vc-relax',
    restart_mode='from_scratch',
    pseudo_dir='/home/abin/work/pwscf/pseudo',
    outdir='/home/abin/work/pwscf/tmp/1',
    prefix='Mg2NiH4',
    tprnfor = .true.
    tstress = .true

   

/
&system   
    ibrav = 13,
    celldm(1) = 27.104339854187,
    celldm(2) =  0.446475632713,
    celldm(3) =  0.451997490065,
    celldm(4) = -0.399069158980,
     nat=28, ntyp=3,
     ecutwfc = 66.0,
     
   
  
/
&electrons

    diagonalization='cg'
    conv_thr = 1.0e-8
    mixing_beta = 0.7
   
/
&IONS
/
&CELL
   cell_dynamics = 'bfgs' ,
   press = 0.00 ,
/
ATOMIC_SPECIES
Mg  24.305  Mg.pz-bhs.UPF
Ni  58.6934 Ni.pz-nd-rrkjus.UPF
H   1.0079  H.pz-van_ak.UPF

ATOMIC_POSITIONS {crystal}

Mg  0.217514  0.252066  0.924578
Mg  0.014433  0.985567  0.750000
Mg  0.513031  0.486969  0.750000
Mg  0.252066  0.217514  0.424578
Mg  0.747934  0.782486  0.575422
Mg  0.782486  0.747934  0.075422
Mg  0.486969  0.513031  0.250000
Mg  0.985567  0.014433  0.250000
Ni  0.111351  0.649729  0.916788
Ni  0.350271  0.888649  0.583212
Ni  0.888649  0.350271  0.083212
Ni  0.649729  0.111351  0.416788
H   0.125635  0.135589  0.581523
H   0.088212  0.489160  0.696272
H   0.547670  0.180306  0.618877
H   0.489160  0.088212  0.196272
H   0.135589  0.125635  0.081523
H   0.276308  0.702670  0.946278
H   0.819694  0.452330  0.881123
H   0.702670  0.276308  0.446278
H   0.297330  0.723692  0.553722
H   0.180306  0.547670  0.118877
H   0.723692  0.297330  0.053722
H   0.864411  0.874365  0.918477
H   0.510840  0.911788  0.803728
H   0.874365  0.864411  0.418477
H   0.911788  0.510840  0.303728
H   0.452330  0.819694  0.381123

K_POINTS {automatic}

  4 4 4 0 0 0
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