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本帖最后由 Drizzy 于 2026-3-17 15:46 编辑
如图所示,是我计算的差分电荷图,我的INCAR如下
DFT-D3 Correction
IVDW = 12 (DFT-D3 method of method with no damping)
Global Parameters
ISTART = 0 (Read existing wavefunction, if there)
ISPIN = 1 (Non-Spin polarised DFT)
# ICHARG = 11 (Non-self-consistent: GGA/LDA band structures)
LREAL = Auto (Projection operators: automatic)
ENCUT = 450 (Cut-off energy for plane wave basis set, in eV)
LWAVE = T (Write WAVECAR or not)
LCHARG = T (Write CHGCAR or not)
LASPH = .TRUE. (Give more accurate total energies and band structure calculations)
PREC = Accurate (Accurate strictly avoids any aliasing or wrap around errors)
# LVTOT = .TRUE. (Write total electrostatic potential into LOCPOT or not)
# LVHAR = .TRUE. (Write ionic + Hartree electrostatic potential into LOCPOT or not)
# NELECT = (No. of electrons: charged cells, be careful)
# LPLANE = .TRUE. (Real space distribution, supercells)
# NWRITE = 2 (Medium-level output)
# KPAR = 2 (Divides k-grid into separate groups)
# NGXF = 240 (FFT grid mesh density for nice charge/potential plots)
# NGYF = 280 (FFT grid mesh density for nice charge/potential plots)
# NGZF = 540 (FFT grid mesh density for nice charge/potential plots)
Electronic Relaxation
ISMEAR = 0 (Gaussian smearing, metals:1)
SIGMA = 0.1 (Smearing value in eV, metals:0.2)
NELM = 90 (Max electronic SCF steps)
NELMIN = 6 (Min electronic SCF steps)
EDIFF = 1E-05 (SCF energy convergence, in eV)
# GGA = PS (PBEsol exchange-correlation)
NCORE = 8
Ionic Relaxation
NSW = 0 (Max ionic steps)
IBRION = -1 (Algorithm: 0-MD, 1-Quasi-New, 2-CG)
ISIF = 2 (Stress/relaxation: 2-Ions, 3-Shape/Ions/V, 4-Shape/Ions)
EDIFFG = -5E-02 (Ionic convergence, eV/AA)
ISYM = 0 (Symmetry: 0=none, 2=GGA, 3=hybrids)
# NELM = 200
LAECHG = T (bader charge)
LELF = T (ELF)
我比较奇怪的点是为什么中间出现了蓝色区域,电荷差分不应该是在每个原子上做加减吗,会不会是我ISIF没有设置为0没有设置为2的原因,我在ms放原子的时候并不是在原位置放的,意思就是在我的ZnCO3体系下,我有两个作用分子,一个A一个B,首先A、B以及AB这三种不同的组合方式分别用高斯进行了结构优化,然后我再将他们放到我的ZnCO3表面进行作用,最后进行电荷的差分,但问题是这三种体系下的作用分子的位置不是一模一样的,会不会是这个造成的原因。第二个图是我在原图上做删减进行单点计算得到的差分电荷,这个图看起来就很正常(画圈是做笔记时候画的,没有其他意思)。
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