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VASP-Structural_Descriptors

Simple description:

Pymatgen-based python script to extract structural descriptors from vasprun.xml or POSCAR file(s)

How to use:

python Structural_descriptor.py [filenames or entries]
  • [filename]: name of vasprun.xml file or POSCAR file (wildcard (*,?) is usable!) if you use xml file, you can extract band gap despite longer execution time
  • [entry or entries]: Descripor of user choice
    • a, b, c, V: lattice parameters and volume
    • atom1-atom2: distance between two atoms are called with one dash (-)
      • atom can be designated as VESTA format or index number starting from 1.
      • Ex) In SrTiO3, Sr --> Sr1 or 1, Fe --> Fe1 or 2, O1 --> O1 or 3
    • Fe5-O18-Mn8: bond angle is callable with two dashes joining three atoms
      • Note: This feature is to calcaulte bond angle so it automatically copies the atom so that 'bond angle' is calculated.
      • Angle between 'far' apart atoms are not reliable with this script
    • SG, #SG: Space group with symbol or space group number
    • Eg: Band gap (xml file is needed for this)
    • Ewald: Ewald summation of the given structure (nominal charge states is applied within script)
    • natom: Number of atoms in the structure
    • GII: Global Instability Index (GII) captures instability of deviation from ideal coordination environment. This uses 'Bond_Valcne2016.csv' file as reference.
    • Mathmatical operation of descriptors:
      • If you format descriptor or column with bracket ('[' and ']'), you can execute simple operations.
      • Ex) [Fe5-O1]+[Fe5-O2]: sum of bond length of Fe5-O1 and Fe5-O2
      • Ex) [11-O1]+[Fe5-O2]: sum of bond length of (11th atom)-O1 and Fe5-O2
      • Ex) [Fe5-O1]/[Fe5-O2]: ratio of bond length between Fe5-O1 and Fe5-O2
      • Ex) [1]/[2]: ratio between 1th column value and 2nd column value (Note that 0th column is for filename).
      • Note: When you use this function on Bash environment, you might need to envelop the entry with single quotation marks (') to avoid syntax error coming from parenthesis.