Structure info
Layer group pm2a
Layer group number 31
Structure origin Wang23
Stability
Energy above convex hull [eV/atom] 0.061
Heat of formation [eV/atom] -0.119
Dynamically stable No
Basic properties
Magnetic No
Band gap (PBE) [eV] 1.276
XYZ CIF JSON
Axis x [Å] y [Å] z [Å] Periodic
1 9.264 0.000 0.000 Yes
2 0.000 7.528 0.000 Yes
3 0.000 -0.000 20.919 No
Lengths [Å] 9.264 7.528 20.919
Angles [°] 90.000 90.000 90.000

Symmetries
2D Bravais type Rectangular (op)
Layer group number 31
Layer group pm2a
Space group number (bulk in AA-stacking) 28
Space group (bulk in AA-stacking) Pma2
Point group mm2
Inversion symmetry No
Structure data
Formula Ag4I8
Stoichiometry AB2
Number of atoms 12
Unit cell area [Å2] 69.742
Thickness [Å] 5.934

Ag4I8 (4AgI2-1)
Heat of formation [eV/atom] -0.12
Energy above convex hull [eV/atom] 0.06
Monolayers from C2DB
Ag2I2 (2AgI-1) -0.26 eV/atom
Ag2I2 (2AgI-2) -0.25 eV/atom
Ag6I6 (6AgI-1) -0.24 eV/atom
Ag5I5 (5AgI-1) -0.24 eV/atom
Ag6I6 (6AgI-2) -0.23 eV/atom
Ag2I2 (2AgI-3) -0.22 eV/atom
Ag6I6 (6AgI-3) -0.22 eV/atom
Ag6I6 (6AgI-4) -0.21 eV/atom
Ag3I3 (3AgI-1) -0.21 eV/atom
Ag3I3 (3AgI-2) -0.21 eV/atom
AgI (1AgI-1) -0.20 eV/atom
Ag2I2 (2AgI-4) -0.19 eV/atom
Ag6I8 (2Ag3I4-1) -0.19 eV/atom
I12Ag15 (3I4Ag5-1) -0.17 eV/atom
Ag6I12 (6AgI2-1) -0.16 eV/atom
Ag3I5 (1Ag3I5-1) -0.14 eV/atom
Ag2I6 (2AgI3-1) -0.13 eV/atom
Ag4I8, (4AgI2-1) -0.12 eV/atom
Ag2I4 (2AgI2-1) -0.12 eV/atom
Ag2I6 (2AgI3-2) -0.11 eV/atom
Ag4I8 (4AgI2-2) -0.10 eV/atom
Ag4I12 (4AgI3-1) -0.09 eV/atom
Ag2I4 (2AgI2-2) -0.08 eV/atom
AgI3 (1AgI3-1) -0.07 eV/atom
AgI2 (1AgI2-1) -0.06 eV/atom
AgI2 (1AgI2-2) -0.06 eV/atom
AgI2 (1AgI2-3) 0.03 eV/atom
Ag2I6 (2AgI3-3) 0.07 eV/atom
Ag2I6 (2AgI3-4) 0.07 eV/atom
Ag2 (2Ag-1) 0.31 eV/atom
Bulk crystals from OQMD123
AgI -0.27 eV/atom
Ag4 0.00 eV/atom
I4 0.00 eV/atom

AB2/4AgI2/1/phonon_bs.png
Minimum eigenvalue of Hessian [eV/Ų] -0.02

Cij (N/m) xx yy xy
xx 8.19 1.38 0.20
yy 2.07 4.86 -0.02
xy 0.00 0.00 3.39
Stiffness tensor eigenvalues
Eigenvalue 0 3.39 N/m
Eigenvalue 1 4.15 N/m
Eigenvalue 2 8.90 N/m

Key values [eV]
Band gap (PBE) 1.276
Direct band gap (PBE) 1.277
Valence band maximum wrt. vacuum (PBE) -5.478
Conduction band minimum wrt. vacuum (PBE) -4.202
DOS BZ

Miscellaneous details
Unique ID 4AgI2-1
Number of atoms 12
Number of species 2
Formula Ag4I8
Reduced formula AgI2
Stoichiometry AB2
Unit cell area [Å2] 69.742
Original file-system folder /home/niflheim2/cmr/C2DB-ASR/tree_Wang23/AB2/AgI2/Ag4I8-9edda0bd3f21
Old uid Ag4I8-30dde4b431fd
Space group (bulk in AA-stacking) Pma2
Space group number (bulk in AA-stacking) 28
Point group mm2
Inversion symmetry No
Layer group number 31
Layer group pm2a
2D Bravais type Rectangular (op)
Thickness [Å] 5.934
Structure origin Wang23
Miscellaneous details
Band gap (PBE) [eV] 1.276
Direct band gap (PBE) [eV] 1.277
gap_dir_nosoc 1.462
Vacuum level [eV] 2.494
Fermi level wrt. vacuum (PBE) [eV] -4.840
Valence band maximum wrt. vacuum (PBE) [eV] -5.478
Conduction band minimum wrt. vacuum (PBE) [eV] -4.202
minhessianeig -0.016
Dynamically stable No
Energy [eV] -24.612
Magnetic No
Total magnetic moment [μB] 0.000
Spin axis z
Magnetic anisotropy energy, xz [meV/unit cell] 0.000
Magnetic anisotropy energy, yz [meV/unit cell] 0.000
Energy above convex hull [eV/atom] 0.061
Heat of formation [eV/atom] -0.119