material

KFeS2
ID:

mp-3827
DOI:

10.17188/1207496

Tags: Potassium iron disulfide Potassium catena-dithioferrate(III) Potassium iron(III) sulfide (1/1/2) Potassium dithioferrate(III) Potassium iron sulfide Potassium iron(III) sulfide

Material Details

Final Magnetic Moment
0.903 μB

Calculated total magnetic moment for the unit cell within the magnetic ordering provided (see below). Typically accurate to the second digit.
Magnetic Ordering
FM
Formation Energy / Atom
-1.061 eV

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

Energy Above Hull / Atom
0.018 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
2.68 g/cm3

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

Decomposes To
KFe2S3 + K9Fe2S7 + FeS2
Band Gap
0.000 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
C2/c [15]
Hall
-C 2yc
Point Group
2/m
Crystal System
monoclinic

Electronic Structure

Topological data for ICSD ID 15557 from Topological Materials Database
Topological Classification
SM*
Subclassification
ESFD†
Crossing Type
Point
* Semimetal
† Enforced Semimetal with Fermi point Degeneracy

Band Structure and Density of States

Warning! Semi-local DFT tends to severely underestimate bandgaps. 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%)

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:
No elastic tensor calculated for this material, so elastic energies not avaialable. Sorting by MCIA instead.
substrate material substrate orientation film orientation MCIA† [Å2]
LaAlO3 (mp-2920) <0 0 1> <0 1 0> 174.5
LaAlO3 (mp-2920) <1 0 0> <0 1 0> 69.8
LaAlO3 (mp-2920) <1 0 1> <1 0 0> 303.2
AlN (mp-661) <0 0 1> <0 1 0> 174.5
AlN (mp-661) <1 0 0> <0 1 0> 174.5
AlN (mp-661) <1 0 1> <1 0 0> 181.9
AlN (mp-661) <1 1 0> <1 0 0> 242.5
AlN (mp-661) <1 1 1> <0 1 0> 314.2
CeO2 (mp-20194) <1 0 0> <0 1 0> 209.4
CeO2 (mp-20194) <1 1 0> <1 0 0> 121.3
GaAs (mp-2534) <1 1 0> <1 0 0> 181.9
GaN (mp-804) <0 0 1> <0 1 0> 209.4
GaN (mp-804) <1 0 0> <1 0 0> 303.2
GaN (mp-804) <1 0 1> <0 1 0> 314.2
GaN (mp-804) <1 1 0> <1 0 0> 60.6
SiO2 (mp-6930) <0 0 1> <0 1 0> 174.5
SiO2 (mp-6930) <1 0 0> <0 1 0> 174.5
SiO2 (mp-6930) <1 0 1> <0 0 1> 317.1
SiO2 (mp-6930) <1 1 0> <0 1 0> 139.6
KCl (mp-23193) <1 0 0> <0 1 0> 244.3
DyScO3 (mp-31120) <0 0 1> <1 0 0> 60.6
DyScO3 (mp-31120) <0 1 0> <0 1 0> 209.4
DyScO3 (mp-31120) <1 0 0> <1 0 0> 181.9
ZnSe (mp-1190) <1 1 0> <1 0 0> 181.9
KTaO3 (mp-3614) <1 0 0> <0 1 0> 244.3
KTaO3 (mp-3614) <1 1 0> <1 0 0> 181.9
KTaO3 (mp-3614) <1 1 1> <0 1 0> 314.2
CdS (mp-672) <1 0 0> <0 1 0> 139.6
CdS (mp-672) <1 1 0> <0 1 0> 349.1
LiF (mp-1138) <1 0 0> <0 1 0> 244.3
LiF (mp-1138) <1 1 0> <0 1 0> 314.2
LiF (mp-1138) <1 1 1> <0 1 0> 314.2
Te2W (mp-22693) <0 0 1> <0 1 0> 174.5
Te2W (mp-22693) <0 1 1> <0 1 0> 174.5
YVO4 (mp-19133) <1 0 0> <0 0 1> 317.1
YVO4 (mp-19133) <1 1 1> <0 1 0> 174.5
TePb (mp-19717) <1 1 0> <0 1 0> 244.3
Te2Mo (mp-602) <0 0 1> <0 1 0> 174.5
Ag (mp-124) <1 1 0> <0 1 0> 314.2
GaSe (mp-1943) <0 0 1> <0 1 0> 244.3
BN (mp-984) <0 0 1> <0 1 0> 244.3
BN (mp-984) <1 0 0> <1 0 0> 303.2
BN (mp-984) <1 0 1> <0 1 0> 244.3
BN (mp-984) <1 1 1> <0 0 1> 237.8
LiNbO3 (mp-3731) <0 0 1> <0 1 0> 174.5
LiNbO3 (mp-3731) <1 0 0> <1 0 0> 303.2
LiNbO3 (mp-3731) <1 0 1> <0 1 0> 244.3
MoS2 (mp-1434) <0 0 1> <0 1 0> 314.2
MoS2 (mp-1434) <1 1 0> <0 0 1> 237.8
Al (mp-134) <1 0 0> <0 1 0> 244.3
Up to 50 entries displayed.
†minimal coincident interface area.

Elasticity

Reference for tensor and properties:
Visualize with ELATE
Stiffness Tensor Cij (GPa)
23 12 9 0 -0 0
12 26 10 0 -2 0
9 10 73 0 0 0
0 0 0 3 0 -0
-0 -2 0 0 12 0
0 0 0 -0 0 8
Compliance Tensor Sij (10-12Pa-1)
58 -24.9 -3.8 0 -1.5 0
-24.9 51.6 -3.9 0 6.8 0
-3.8 -3.9 14.7 0 -1.1 0
0 0 0 321.6 0 19.1
-1.5 6.8 -1.1 0 84.2 0
0 0 0 19.1 0 131.8
Shear Modulus GV
11 GPa
Bulk Modulus KV
20 GPa
Shear Modulus GR
7 GPa
Bulk Modulus KR
17 GPa
Shear Modulus GVRH
9 GPa
Bulk Modulus KVRH
19 GPa
Elastic Anisotropy
3.16
Poisson's Ratio
0.30

Similar Structures beta feature

Explanation of dissimilarity measure: Documentation.
material dissimilarity Ehull # of elements
KFeSe2 (mp-9884) 0.1793 0.000 3
RbFeSe2 (mp-7086) 0.1558 0.026 3
RbFeS2 (mp-5372) 0.1879 0.000 3
RbFeSe2 (mp-917532) 0.1694 0.026 3
RbFeS2 (mp-1080808) 0.1413 0.000 3
K2NbCuS4 (mp-9763) 0.1886 0.000 4
Cs2MnSnTe4 (mp-22235) 0.2306 0.000 4
Rb2TaCuS4 (mp-11923) 0.1906 0.000 4
Rb2VCuS4 (mp-15219) 0.2473 0.000 4
Rb2NbCuS4 (mp-15221) 0.1953 0.000 4
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 Fe_pv S
Final Energy/Atom
-5.1927 eV
Corrected Energy
-44.1954 eV
-44.1954 eV = -41.5415 eV (uncorrected energy) - 2.6538 eV (MP Anion Correction)

Detailed input parameters and outputs for all calculations

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ICSD IDs
  • 167454
  • 202383
  • 68383
  • 600292
  • 202380
  • 15557
  • 167453
  • 202382
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User remarks:
  • Potassium iron disulfide

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)