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K2TaCuBr6

High-Entropy Materials HEA

MP-ID: mp-1112217 · Space group: Fm-3m (#225)

Basic Information

Formula
K2TaCuBr6
MP-ID
mp-1112217
Elements
4
Sites
10
Density
4.4238
g/cm³
Volume
301.09
ų
Cell a
7.5232
Å
Cell b
7.5232
Å
Cell c
7.5232
Å
α Angle
60.00
°
β Angle
60.00
°
γ Angle
60.00
°
Space Group
Fm-3m
Point Group
m-3m
Crystal System
Cubic
Bravais Lattice
Cubic F
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
14.42 6.1427 19.0 (1,1,1)
16.67 5.3197 89.4 (1,1,0)
23.65 3.7616 20.1 (2,1,1)
27.81 3.2079 11.0 (2,2,1)
29.07 3.0713 31.9 (2,2,2)
33.70 2.6599 100.0 (2,2,0)
36.82 2.4408 4.8 (3,2,2)
37.82 2.3790 47.4 (3,2,1)
41.58 2.1718 8.9 (3,3,2)
44.24 2.0476 4.9 (3,3,1)
48.40 1.8808 70.0 (4,2,2)
50.77 1.7984 5.0 (4,3,2)
51.54 1.7732 24.6 (4,3,3)
54.55 1.6822 3.9 (4,3,1)
56.74 1.6225 1.7 (4,4,3)
57.45 1.6040 12.3 (4,4,2)
60.27 1.5357 23.7 (4,4,4)
62.32 1.4898 2.8 (4,4,1)
63.00 1.4754 10.8 (5,3,2)
65.67 1.4218 4.2 (5,4,3)
67.64 1.3851 2.9 (5,4,4)
70.86 1.3299 10.9 (4,4,0)
73.38 1.2902 13.9 (5,5,4)
75.88 1.2539 2.0 (6,3,3)
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Energy Properties

Formation Energy/atom
-1.24050
eV/atom
Energy/atom
-4.04555
eV/atom
Energy above Hull
0.2462
eV/atom
Uncorrected Energy
-3.7252
eV/atom
Volume/atom
30.11
ų
c/a Ratio
-

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
1.9991
μB
Mag. Ordering
FM
Mag. Sites
1
Magnetization/Volume
0.006640
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Br · 0.600
Element Family
Metalloid-Nonmetal
Solute Fraction
0.400
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0889
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
9.0531
J/mol·K
Ω Parameter
78.2626
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
29.131%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.8826
smaller = more stable mixing
VEC
4.800
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.080
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7855
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (2)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1112217
Reference Citation

The crystal structure and related material properties of K2TaCuBr6 were obtained from the Materials Project database (MP-ID: mp-1112217, 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_K2TaCuBr6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.52318765
_cell_length_b   7.52318765
_cell_length_c   7.52318765
_cell_angle_alpha   60.00000000
_cell_angle_beta   60.00000000
_cell_angle_gamma   60.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2TaCuBr6
_chemical_formula_sum   'K2 Ta1 Cu1 Br6'
_cell_volume   301.08608517
_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  0.25000000  0.25000000  0.25000000  1.0
  K  K1  1  0.75000000  0.75000000  0.75000000  1.0
  Ta  Ta2  1  0.50000000  0.50000000  0.50000000  1.0
  Cu  Cu3  1  0.00000000  0.00000000  0.00000000  1.0
  Br  Br4  1  0.25139600  0.25139600  0.74860400  1.0
  Br  Br5  1  0.25139600  0.74860400  0.74860400  1.0
  Br  Br6  1  0.74860400  0.74860400  0.25139600  1.0
  Br  Br7  1  0.25139600  0.74860400  0.25139600  1.0
  Br  Br8  1  0.74860400  0.25139600  0.74860400  1.0
  Br  Br9  1  0.74860400  0.25139600  0.25139600  1.0
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