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K(CoSe)2

High-Entropy Materials HEA Traditional Materials TRA Elasticity Data ELA

MP-ID: mp-4668 · Space group: I4/mmm (#139)

Basic Information

Formula
K(CoSe)2
MP-ID
mp-4668
Elements
3
Sites
5
Density
5.1601
g/cm³
Volume
101.33
ų
Cell a
3.8976
Å
Cell b
3.8976
Å
Cell c
7.2172
Å
α Angle
105.67
°
β Angle
105.67
°
γ Angle
90.00
°
Space Group
I4/mmm
Point Group
4/mmm
Crystal System
Tetragonal
Bravais Lattice
Tetragonal I
Stability
No
Packing Fraction
0.7400

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
13.27 6.6703 88.7 (0,0,1)
23.78 3.7412 13.2 (1,0,0)
26.73 3.3351 1.5 (0,0,2)
30.50 2.9311 100.0 (1,0,1)
32.49 2.7560 6.4 (1,1,-1)
35.23 2.5472 23.5 (1,1,0)
40.99 2.2017 1.4 (1,0,2)
42.55 2.1245 46.9 (1,1,1)
46.61 1.9488 41.5 (2,0,-1)
48.68 1.8706 12.9 (2,0,0)
52.91 1.7305 46.7 (1,1,2)
52.98 1.7284 3.3 (2,1,-1)
53.52 1.7121 6.6 (1,0,3)
55.07 1.6676 4.9 (0,0,4)
56.72 1.6229 32.1 (2,1,0)
67.62 1.3855 4.9 (1,0,4)
68.03 1.3780 12.6 (2,2,-2)
69.68 1.3495 4.2 (2,2,-1)
70.60 1.3341 3.3 (0,0,5)
73.65 1.2862 5.3 (2,1,2)
74.96 1.2670 7.3 (2,0,3)
76.37 1.2471 6.6 (3,0,0)
77.43 1.2325 1.1 (3,1,-2)
79.00 1.2120 3.4 (3,1,-1)
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Energy Properties

Formation Energy/atom
-0.65349
eV/atom
Energy/atom
-5.13149
eV/atom
Energy above Hull
0.0267
eV/atom
Uncorrected Energy
-4.9427
eV/atom
Volume/atom
20.27
ų
c/a Ratio
1.8517

Electronic Properties

Metallic
Metal
Band Gap
0
eV
Direct Gap
No
CBM
N/A
eV

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
2.2230
μB
Mag. Ordering
FM
Mag. Sites
2
Magnetization/Volume
0.021940
μB/ų

Elastic Properties

KVRH
50.314
GPa
GVRH
24.198
GPa
Young's Modulus E
62.564
GPa
Poisson Ratio ν
0.293
Pugh Ratio K/G
2.079
Vickers Hardness Est.
2.478
GPa
Ductility
Brittle
Anisotropy
0.872
Lame λ
34.182
GPa

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Co · 0.400
Element Family
3d-TM
Solute Fraction
0.600
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0549
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.7706
J/mol·K
Ω Parameter
0.0000
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
28.749%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.6334
smaller = more stable mixing
VEC
5.400
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.000
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9602
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.535
Family
Co-rich Multi-Component
Matrix Element
Co · 0.400

Elasticity Features

Elastic Modulus Comparison (GPa)
Elastic Features
Elastic Anisotropy AU
0.8720
Homogeneous Poisson ν
0.2930
Debye Temperature
366.1
K
Sound Velocity
2,416.6
m/s
Homogeneity
0.2930

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-4668
Reference Citation

The crystal structure and related material properties of K(CoSe)2 were obtained from the Materials Project database (MP-ID: mp-4668, database version v2026.04.13).

Literature Citation

Horton, M.K., Huck, P., Yang, R.X. et al. Accelerated data-driven materials science with the Materials Project. Nat. Mater. 24, 1522–1532 (2025). https://doi.org/10.1038/s41563-025-02272-0

BibTeX
@article{Horton2025,
  author  = {Horton, Matthew K. and Huck, Patrick and Yang, Ruo Xi and Munro, Jason M. and Dwaraknath, Shyam and Ganose, Alex M. and Kingsbury, Ryan S. and Wen, Mingjian and Shen, Jimmy X. and Mathis, Tyler S. and Kaplan, Aaron D. and Berket, Karlo and Riebesell, Janosh and George, Janine and Rosen, Andrew S. and Spotte-Smith, Evan W. C. and McDermott, Matthew J. and Cohen, Orion A. and Dunn, Alex and Kuner, Matthew C. and Rignanese, Gian-Marco and Petretto, Guido and Waroquiers, David and Griffin, Sinead M. and Neaton, Jeffrey B. and Chrzan, Daryl C. and Asta, Mark and Hautier, Geoffroy and Cholia, Shreyas and Ceder, Gerbrand and Ong, Shyue Ping and Jain, Anubhav and Persson, Kristin A.},
  title   = {Accelerated data-driven materials science with the Materials Project},
  journal = {Nature Materials},
  year    = {2025},
  volume  = {24},
  number  = {10},
  pages   = {1522--1532},
  month   = {oct},
  doi     = {10.1038/s41563-025-02272-0},
  issn    = {1476-4660},
  url     = {https://doi.org/10.1038/s41563-025-02272-0},
  abstract = {The Materials Project was launched formally in 2011 to drive materials discovery forwards through high-throughput computation and open data. More than a decade later, the Materials Project has become an indispensable tool used by more than 600,000 materials researchers around the world. This Perspective describes how the Materials Project, as a data platform and a software ecosystem, has helped to shape research in data-driven materials science. We cover how sustainable software and computational methods have accelerated materials design while becoming more open source and collaborative in nature. Next, we present cases where the Materials Project was used to understand and discover functional materials. We then describe our efforts to meet the needs of an expanding user base, through technical infrastructure updates ranging from data architecture and cloud resources to interactive web applications. Finally, we discuss opportunities to better aid the research community, with the vision that more accessible and easy-to-understand materials data will result in democratized materials knowledge and an increasingly collaborative community.}
}

3D Crystal Structure Rendering

Loading 3D structure…

Style: Ball & Stick
Raw CIF Data
# generated using pymatgen
data_K(CoSe)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.89761200
_cell_length_b   3.89761200
_cell_length_c   7.21721494
_cell_angle_alpha   105.66556928
_cell_angle_beta   105.66556928
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K(CoSe)2
_chemical_formula_sum   'K1 Co2 Se2'
_cell_volume   101.33060162
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  K  K0  1  0.00000000  0.00000000  0.00000000  1.0
  Co  Co1  1  0.75000000  0.25000000  0.50000000  1.0
  Co  Co2  1  0.25000000  0.75000000  0.50000000  1.0
  Se  Se3  1  0.34907400  0.34907400  0.69814800  1.0
  Se  Se4  1  0.65092600  0.65092600  0.30185200  1.0
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