material

GaSe

ID:

mp-1572

DOI:

10.17188/1191339


Tags: Gallium selenide - epsilon, 2H Gallium selenide (1/1) Gallium selenide (1/1) - epsilon

Material Details

Final Magnetic Moment
0.000 μB

Calculated total magnetic moment for the unit cell within the magnetic ordering provided (see below). Typically accurate to the second digit.

Magnetic Ordering
Unknown
Formation Energy / Atom
-0.592 eV

Calculated formation energy from the elements normalized to per atom in the unit cell.

Energy Above Hull / Atom
0.000 eV

The energy of decomposition of this material into the set of most stable materials at this chemical composition, in eV/atom. Stability is tested against all potential chemical combinations that result in the material's composition. For example, a Co2O3 structure would be tested for decomposition against other Co2O3 structures, against Co and O2 mixtures, and against CoO and O2 mixtures.

Density
4.39 g/cm3

The calculated bulk crystalline density, typically underestimated due calculated cell volumes overestimated on average by 3% (+/- 6%)

Decomposes To
GaSe
Band Gap
1.241 eV

In general, band gaps computed with common exchange-correlation functionals such as the LDA and GGA are severely underestimated. Typically the disagreement is reported to be ~50% in the literature. Some internal testing by the Materials Project supports these statements; typically, we find that band gaps are underestimated by ~40%. We additionally find that several known insulators are predicted to be metallic.

Space Group

Hermann Mauguin
P6m2 [187]
Hall
P 6 2
Point Group
6m2
Crystal System
hexagonal

Band Structure

Density of States
Warning! Semi-local DFT tends to severely underestimate bandgaps. Please see the wiki for more info.

sign indicates spin ↑ ↓

  • Cu
  • Ag
  • Mo
  • Fe

Calculated powder diffraction pattern; note that peak spacings may be affected due to inaccuracies in calculated cell volume, which is typically overestimated on average by 3% (+/- 6%)

X-Ray Absorption Spectra

FEFF XANES

Select an element to display a spectrum averaged over all sites of that element in the structure.

Apply Gaussian smoothing:

0 eV
3 eV
FWHM: 0 eV

Download spectra for every symmetrically equivalent absorption site in the structure.

Download FEFF Input parameters.

Warning: These results are intended to be semi-quantitative in that corrections, such as edge shifts and Debye-Waller damping, have not been included.

Substrates

Reference for minimal coincident interface area (MCIA) and elastic energy:
substrate orientation:
substrate material substrate orientation film orientation elastic energy [meV] MCIA [Å2]
CaCO3 (mp-3953) <0 0 1> <0 0 1> 0.000 88.4
Al2O3 (mp-1143) <0 0 1> <0 0 1> 0.000 240.0
GaSe (mp-1943) <0 0 1> <0 0 1> 0.000 12.6
GaSe (mp-1943) <1 1 1> <1 1 1> 0.001 118.4
GaSe (mp-1943) <1 0 1> <1 0 1> 0.001 69.1
GaSe (mp-1943) <1 1 0> <1 1 0> 0.001 117.8
GaSe (mp-1943) <1 0 0> <1 0 0> 0.001 68.0
C (mp-66) <1 1 1> <0 0 1> 0.001 88.4
LiTaO3 (mp-3666) <0 0 1> <0 0 1> 0.001 164.2
PbSe (mp-2201) <1 1 1> <0 0 1> 0.004 202.1
Mg (mp-153) <0 0 1> <0 0 1> 0.006 113.7
CdWO4 (mp-19387) <0 0 1> <1 0 0> 0.008 271.9
GaSb (mp-1156) <1 1 1> <0 0 1> 0.013 202.1
Te2Mo (mp-602) <1 0 0> <1 0 0> 0.015 271.9
LiNbO3 (mp-3731) <0 0 1> <0 0 1> 0.021 164.2
CdSe (mp-2691) <1 1 1> <0 0 1> 0.024 202.1
ZrO2 (mp-2858) <0 1 1> <1 0 0> 0.025 271.9
Cu (mp-30) <1 1 0> <1 0 0> 0.027 271.9
LaF3 (mp-905) <0 0 1> <0 0 1> 0.028 315.8
MoS2 (mp-1434) <0 0 1> <0 0 1> 0.028 113.7
WS2 (mp-224) <0 0 1> <0 0 1> 0.029 113.7
Ge (mp-32) <1 0 0> <0 0 1> 0.029 265.3
GaAs (mp-2534) <1 0 0> <0 0 1> 0.031 265.3
TiO2 (mp-390) <0 0 1> <0 0 1> 0.034 101.0
C (mp-66) <1 1 0> <1 0 0> 0.035 271.9
TePb (mp-19717) <1 0 0> <0 0 1> 0.035 303.1
C (mp-66) <1 0 0> <1 0 0> 0.039 271.9
AlN (mp-661) <1 0 1> <0 0 1> 0.039 303.1
ZnSe (mp-1190) <1 0 0> <0 0 1> 0.040 265.3
BN (mp-984) <0 0 1> <0 0 1> 0.041 37.9
CaCO3 (mp-3953) <1 0 1> <1 0 0> 0.041 271.9
Mg (mp-153) <1 0 1> <1 0 1> 0.041 276.6
ZnO (mp-2133) <1 1 1> <1 0 1> 0.042 276.6
LiF (mp-1138) <1 0 0> <0 0 1> 0.043 265.3
MgF2 (mp-1249) <0 0 1> <0 0 1> 0.044 240.0
TiO2 (mp-2657) <1 1 1> <0 0 1> 0.049 88.4
ZnO (mp-2133) <0 0 1> <0 0 1> 0.052 37.9
MoSe2 (mp-1634) <0 0 1> <0 0 1> 0.059 37.9
BN (mp-984) <1 0 0> <1 0 0> 0.060 136.0
WSe2 (mp-1821) <0 0 1> <0 0 1> 0.060 37.9
SiO2 (mp-6930) <0 0 1> <0 0 1> 0.069 88.4
WS2 (mp-224) <1 1 1> <0 0 1> 0.073 240.0
ZrO2 (mp-2858) <1 1 -1> <1 0 1> 0.079 138.3
Te2W (mp-22693) <0 1 0> <1 0 0> 0.080 271.9
ZnO (mp-2133) <1 0 0> <0 0 1> 0.080 138.9
BN (mp-984) <1 0 1> <0 0 1> 0.083 138.9
C (mp-48) <1 1 0> <0 0 1> 0.085 265.3
C (mp-48) <1 0 1> <0 0 1> 0.086 240.0
BaF2 (mp-1029) <1 1 1> <0 0 1> 0.095 202.1
LiF (mp-1138) <1 1 0> <0 0 1> 0.115 189.5
Up to 50 entries displayed.
minimal coincident interface area.

Elasticity

Reference for tensor and properties:
Stiffness Tensor Cij (GPa)
78 18 2 -0 -0 0
18 78 2 0 -0 0
2 2 5 0 0 0
-0 0 0 1 0 0
-0 0 0 0 1 0
0 0 0 0 0 30
Compliance Tensor Sij (10-12Pa-1)
13.6 -3.1 -4 0 0 0
-3.1 13.6 -4 0 0 0
-4 -4 197.7 0 0 0
0 0 0 1101.9 0 0
0 0 0 0 1101.9 0
0 0 0 0 0 33.4
Shear Modulus GV
16 GPa
Bulk Modulus KV
23 GPa
Shear Modulus GR
2 GPa
Bulk Modulus KR
5 GPa
Shear Modulus GVRH
9 GPa
Bulk Modulus KVRH
14 GPa
Elastic Anisotropy
38.56
Poisson's Ratio
0.24

Piezoelectricity

Reference for tensor and properties: Methodology
Piezoelectric Tensor eij (C/m2)
0.00000 0.00000 0.00000 0.00000 0.00000 0.19825
0.19825 -0.19825 0.00000 0.00000 0.00000 0.00000
0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
Piezoelectric Modulus ‖eijmax
0.19825 C/m2
Crystallographic Direction vmax
0.00000
1.00000
0.00000

Calculation Summary

Elasticity

Methodology

Structure Optimization

Run Type
GGA
Energy Cutoff
520 eV
# of K-points
28
U Values
--
Pseudopotentials
VASP PAW: Ga_d Se
Final Energy/Atom
-3.8520 eV
Corrected Energy
-30.8157 eV
-30.8157 eV = -30.8157 eV (uncorrected energy)

Detailed input parameters and outputs for all calculations


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ICSD IDs
  • 71082
  • 73387
  • 660262
  • 601159

Displaying lattice parameters for primitive cell; note that calculated cell volumes are typically overestimated on average by 3% (+/- 6%). Note the primitive cell may appear less symmetric than the conventional cell representation (see "Structure Type" selector below the 3d structure)