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USiAu

High-Entropy Materials HEA Traditional Materials TRA Elasticity Data ELA

MP-ID: mp-9487 · Space group: P-6m2 (#187)

Basic Information

Formula
USiAu
MP-ID
mp-9487
Elements
3
Sites
3
Density
12.3034
g/cm³
Volume
62.50
ų
Cell a
4.2895
Å
Cell b
4.2895
Å
Cell c
3.9222
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
120.00
°
Space Group
P-6m2
Point Group
-6m2
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 15)
2θd (Å)Ihkl
23.95 3.7148 27.6 (1,0,-1,0)
33.22 2.6971 100.0 (1,0,-1,1)
42.13 2.1448 39.4 (2,-1,-1,0)
46.30 1.9611 10.1 (0,0,0,2)
49.04 1.8574 4.4 (2,0,-2,0)
52.79 1.7343 7.0 (1,0,-1,2)
54.68 1.6787 25.0 (2,0,-2,1)
64.37 1.4473 23.1 (2,-1,-1,2)
66.60 1.4041 3.6 (3,-1,-2,0)
69.73 1.3486 3.2 (2,0,-2,2)
71.35 1.3219 23.3 (3,-1,-2,1)
77.01 1.2383 7.1 (3,0,-3,0)
77.38 1.2333 9.4 (1,0,-1,3)
84.95 1.1416 1.3 (3,-2,-1,2)
84.95 1.1416 2.6 (3,-1,-2,2)
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Energy Properties

Formation Energy/atom
-0.21628
eV/atom
Energy/atom
-6.87981
eV/atom
Energy above Hull
0.0777
eV/atom
Uncorrected Energy
-6.8798
eV/atom
Volume/atom
20.83
ų
c/a Ratio
0.9144

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
2.4463
μB
Mag. Ordering
FM
Mag. Sites
1
Magnetization/Volume
0.039140
μB/ų

Elastic Properties

KVRH
105.688
GPa
GVRH
1.484
GPa
Young's Modulus E
4.431
GPa
Poisson Ratio ν
0.493
Pugh Ratio K/G
71.218
Vickers Hardness Est.
0.000
GPa
Ductility
Brittle
Anisotropy
-9.242
Lame λ
104.699
GPa

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
U · 0.333
Element Family
Actinide
Solute Fraction
0.667
Interstitial Fraction
0.333

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0986
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
9.1339
J/mol·K
Ω Parameter
1.9749
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
16.305%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.4744
smaller = more stable mixing
VEC
7.500
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-6.829
kJ/mol; negative = exothermic mixing
Entropy Norm
1.0000
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
C
Score
0.378
Family
U-rich Multi-Component
Matrix Element
U · 0.333

Elasticity Features

Elastic Modulus Comparison (GPa)
Elastic Features
Elastic Anisotropy AU
-9.2420
Homogeneous Poisson ν
0.4930
Debye Temperature
54.7
K
Sound Velocity
397.5
m/s
Homogeneity
0.4930

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-9487
Reference Citation

The crystal structure and related material properties of USiAu were obtained from the Materials Project database (MP-ID: mp-9487, 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_USiAu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.28953004
_cell_length_b   4.28953004
_cell_length_c   3.92222500
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   120.00000066
_symmetry_Int_Tables_number   1
_chemical_formula_structural   USiAu
_chemical_formula_sum   'U1 Si1 Au1'
_cell_volume   62.50036593
_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
  U  U0  1  0.66666700  0.33333300  0.00000000  1.0
  Si  Si1  1  0.00000000  0.00000000  0.50000000  1.0
  Au  Au2  1  0.33333300  0.66666700  0.50000000  1.0
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