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U2AlCu3

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-7775 · Space group: P6_3/mmc (#194)

Basic Information

Formula
U2AlCu3
MP-ID
mp-7775
Elements
3
Sites
12
Density
11.6697
g/cm³
Volume
197.41
ų
Cell a
5.4512
Å
Cell b
5.4512
Å
Cell c
7.6711
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
120.00
°
Space Group
P6_3/mmc
Point Group
6/mmm
Crystal System
Hexagonal
Bravais Lattice
Hexagonal P
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
18.80 4.7209 47.1 (1,0,-1,0)
22.11 4.0206 37.5 (1,0,-1,1)
30.02 2.9769 10.7 (1,0,-1,2)
32.86 2.7256 68.7 (2,-1,-1,0)
38.12 2.3605 24.9 (2,0,-2,0)
39.96 2.2561 68.5 (2,0,-2,1)
40.10 2.2484 100.0 (1,0,-1,3)
40.61 2.2218 43.7 (2,-1,-1,2)
51.20 1.7843 5.0 (3,-1,-2,0)
51.43 1.7768 7.0 (1,0,-1,4)
52.67 1.7379 7.3 (3,-1,-2,1)
52.67 1.7379 3.7 (2,1,-3,1)
52.78 1.7344 10.8 (2,0,-2,3)
56.92 1.6178 6.6 (3,-1,-2,2)
58.67 1.5736 13.7 (3,0,-3,0)
58.88 1.5684 13.1 (2,-1,-1,4)
63.58 1.4633 48.2 (3,-1,-2,3)
63.79 1.4591 1.5 (1,0,-1,5)
63.95 1.4559 11.8 (3,0,-3,2)
68.90 1.3628 14.9 (4,-2,-2,0)
68.90 1.3628 7.4 (2,2,-4,0)
72.14 1.3094 2.0 (4,-1,-3,0)
72.14 1.3094 1.0 (3,1,-4,0)
72.33 1.3063 2.5 (3,-2,-1,4)
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Energy Properties

Formation Energy/atom
0.02850
eV/atom
Energy/atom
-6.40917
eV/atom
Energy above Hull
0.1548
eV/atom
Uncorrected Energy
-6.4092
eV/atom
Volume/atom
16.45
ų
c/a Ratio
1.4072

Electronic Properties

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

Magnetic Properties

Magnetic
No
Total Mag. Moment
0.7853
μB
Mag. Ordering
NM
Mag. Sites
0
Magnetization/Volume
0.003980
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Cu · 0.500
Element Family
3d-TM
Solute Fraction
0.500
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0114
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.4088
J/mol·K
Ω Parameter
32.8705
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
14.413%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.2346
smaller = more stable mixing
VEC
9.000
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-0.333
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9206
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.527
Family
Cu-based Alloy
Matrix Element
Cu · 0.500

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-7775
Reference Citation

The crystal structure and related material properties of U2AlCu3 were obtained from the Materials Project database (MP-ID: mp-7775, 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_U2AlCu3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.45124419
_cell_length_b   5.45124419
_cell_length_c   7.67106100
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   120.00000225
_symmetry_Int_Tables_number   1
_chemical_formula_structural   U2AlCu3
_chemical_formula_sum   'U4 Al2 Cu6'
_cell_volume   197.41371939
_cell_formula_units_Z   2
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
  U  U0  1  0.33333300  0.66666700  0.41429400  1.0
  U  U1  1  0.66666700  0.33333300  0.91429400  1.0
  U  U2  1  0.66666700  0.33333300  0.58570600  1.0
  U  U3  1  0.33333300  0.66666700  0.08570600  1.0
  Al  Al4  1  0.00000000  0.00000000  0.50000000  1.0
  Al  Al5  1  0.00000000  0.00000000  0.00000000  1.0
  Cu  Cu6  1  0.17480900  0.82519100  0.75000000  1.0
  Cu  Cu7  1  0.34961800  0.17480900  0.25000000  1.0
  Cu  Cu8  1  0.82519100  0.17480900  0.25000000  1.0
  Cu  Cu9  1  0.65038200  0.82519100  0.75000000  1.0
  Cu  Cu10  1  0.17480900  0.34961800  0.75000000  1.0
  Cu  Cu11  1  0.82519100  0.65038200  0.25000000  1.0
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