material

K2Se
ID:

mp-8426
DOI:

10.17188/1308096

Tags: Dipotassium selenide Potassium selenide

Material Details

Final Magnetic Moment
0.001 μB

Calculated total magnetic moment for the unit cell within the magnetic ordering provided (see below). Typically accurate to the second digit.
Magnetic Ordering
NM
Formation Energy / Atom
-1.097 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
2.24 g/cm3

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

Decomposes To
Stable
Band Gap
2.093 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
Fm3m [225]
Hall
-F 4 2 3
Point Group
m3m
Crystal System
cubic

Electronic Structure

Topological data for ICSD ID 60440 from Topological Materials Database
Topological Classification
trivial*
Subclassification
LCEBR†
* trivial insulator or metal
† Linear Combination of Elementary Band Representations

Band Structure and Density of States

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

Vibrational Properties

Reference for phonon calculations and visualization: Visualize with phononwebsite

Phonon dispersion

Density of States
Warning! These calculations were performed using a PBEsol exchange correlation functional in the framework of DFPT using the Abinit code. Please see the wiki for more info.

X-Ray Diffraction

    Select radiation source:
  • 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%)

Substrates

Reference for minimal coincident interface area (MCIA) and elastic energy:
substrate orientation:
No elastic tensor calculated for this material, so elastic energies not avaialable. Sorting by MCIA instead.
substrate material substrate orientation film orientation MCIA† [Å2]
KP(HO2)2 (mp-23959) <0 0 1> <1 0 0> 240.7
LiF (mp-1138) <1 0 0> <1 0 0> 300.9
BN (mp-984) <0 0 1> <1 1 1> 104.2
LiGaO2 (mp-5854) <1 0 1> <1 0 0> 180.5
Al (mp-134) <1 1 0> <1 1 0> 255.3
Si (mp-149) <1 1 0> <1 1 0> 85.1
Si (mp-149) <1 0 0> <1 0 0> 60.2
CeO2 (mp-20194) <1 1 0> <1 1 0> 85.1
CeO2 (mp-20194) <1 0 0> <1 0 0> 60.2
NdGaO3 (mp-3196) <0 1 0> <1 1 0> 85.1
Ge (mp-32) <1 0 0> <1 0 0> 300.9
TiO2 (mp-2657) <1 0 1> <1 1 0> 255.3
GaP (mp-2490) <1 1 0> <1 1 0> 85.1
GaP (mp-2490) <1 0 0> <1 0 0> 60.2
GdScO3 (mp-5690) <0 0 1> <1 1 0> 255.3
SiC (mp-7631) <1 0 1> <1 0 0> 240.7
KTaO3 (mp-3614) <1 1 0> <1 1 0> 255.3
GaAs (mp-2534) <1 0 0> <1 0 0> 300.9
CaF2 (mp-2741) <1 1 0> <1 1 0> 85.1
CaF2 (mp-2741) <1 0 0> <1 0 0> 60.2
TbScO3 (mp-31119) <0 0 1> <1 1 0> 255.3
NdGaO3 (mp-3196) <0 1 1> <1 1 1> 104.2
ZnSe (mp-1190) <1 0 0> <1 0 0> 300.9
BN (mp-984) <1 0 0> <1 1 0> 255.3
BN (mp-984) <1 1 0> <1 1 0> 170.2
BaF2 (mp-1029) <1 1 0> <1 1 0> 170.2
LiF (mp-1138) <1 1 0> <1 1 0> 255.3
InAs (mp-20305) <1 0 0> <1 0 0> 300.9
Au (mp-81) <1 0 0> <1 0 0> 300.9
NdGaO3 (mp-3196) <1 1 0> <1 0 0> 60.2
ZnTe (mp-2176) <1 0 0> <1 0 0> 300.9
GaSe (mp-1943) <0 0 1> <1 1 0> 255.3
DyScO3 (mp-31120) <0 0 1> <1 1 0> 255.3
C (mp-48) <1 0 0> <1 1 0> 170.2
KCl (mp-23193) <1 1 0> <1 1 0> 170.2
SiC (mp-8062) <1 0 0> <1 0 0> 300.9
BN (mp-984) <1 1 1> <1 0 0> 240.7
MgO (mp-1265) <1 0 0> <1 0 0> 240.7
Ga2O3 (mp-886) <1 0 -1> <1 0 0> 300.9
TiO2 (mp-390) <1 0 0> <1 0 0> 300.9
Ag (mp-124) <1 0 0> <1 0 0> 300.9
TeO2 (mp-2125) <0 1 1> <1 0 0> 300.9
LaAlO3 (mp-2920) <1 0 1> <1 0 0> 300.9
LiAlO2 (mp-3427) <0 0 1> <1 0 0> 240.7
YAlO3 (mp-3792) <1 0 1> <1 0 0> 300.9
TeO2 (mp-2125) <0 0 1> <1 1 0> 255.3
C (mp-48) <0 0 1> <1 0 0> 300.9
Al (mp-134) <1 0 0> <1 0 0> 300.9
ZnO (mp-2133) <1 1 1> <1 1 0> 255.3
SiC (mp-8062) <1 1 1> <1 0 0> 300.9
Up to 50 entries displayed.
†minimal coincident interface area.

Elasticity

Reference for tensor and properties:
Visualize with ELATE
Stiffness Tensor Cij (GPa)
29 10 10 0 0 0
10 29 10 0 0 0
10 10 29 0 0 0
0 0 0 7 0 0
0 0 0 0 7 0
0 0 0 0 0 7
Compliance Tensor Sij (10-12Pa-1)
42 -10.7 -10.7 0 0 0
-10.7 42 -10.7 0 0 0
-10.7 -10.7 42 0 0 0
0 0 0 133.6 0 0
0 0 0 0 133.6 0
0 0 0 0 0 133.6
Shear Modulus GV
8 GPa
Bulk Modulus KV
16 GPa
Shear Modulus GR
8 GPa
Bulk Modulus KR
16 GPa
Shear Modulus GVRH
8 GPa
Bulk Modulus KVRH
16 GPa
Elastic Anisotropy
0.07
Poisson's Ratio
0.28

Dielectric Properties

Reference for tensor and properties: Methodology
Dielectric Tensor εij∞ (electronic contribution)
3.30 -0.00 -0.00
-0.00 3.30 0.00
-0.00 0.00 3.30
Dielectric Tensor εij (total)
6.37 -0.00 -0.00
-0.00 6.38 0.00
-0.00 0.00 6.38
Polycrystalline dielectric constant εpoly∞
(electronic contribution)
3.30
Polycrystalline dielectric constant εpoly
(total)
6.38
Refractive Index n
1.82
Potentially ferroelectric?
Unknown

Similar Structures beta feature

Explanation of dissimilarity measure: Documentation.
material dissimilarity Ehull # of elements
TaSbRu (mp-31454) 0.0000 0.000 3
MnSbAu (mp-5944) 0.0000 0.115 3
CdSbAu (mp-16246) 0.0000 0.011 3
MgSbPt (mp-10184) 0.0000 0.000 3
GdSbPt (mp-11839) 0.0000 0.000 3
SiO2 (mp-10064) 0.0000 1.272 2
In2Au (mp-22154) 0.0000 0.000 2
CeO2 (mp-20194) 0.0000 0.000 2
PaO2 (mp-2364) 0.0000 0.000 2
PrO2 (mp-1302) 0.0000 0.084 2
Up to 5 similar elemental, binary, ternary, quaternary, etc. structures displayed (dissimilarity threshold 0.75). Ehull: energy above hull per atom [eV].

Calculation Summary

Elasticity

Methodology

Structure Optimization

Run Type
GGA
Energy Cutoff
520 eV
# of K-points
None
U Values
--
Pseudopotentials
VASP PAW: K_sv Se
Final Energy/Atom
-3.0022 eV
Corrected Energy
-9.4785 eV
Uncorrected energy = -9.0065 eV Composition-based energy adjustment (-0.472 eV/atom x 1.0 atoms) = -0.4720 eV Corrected energy = -9.4785 eV

Detailed input parameters and outputs for all calculations

Show JSON History Show BibTex Citation Download BibTex Citation
ICSD IDs
  • 168448
  • 60440
Submitted by
User remarks:
  • Dipotassium selenide

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)