Sc2AlCu

高熵材料 HEA 传统材料 TRA 弹性数据 ELA

MP-ID: mp-972884 · Space group: Fm-3m (#225)

Materials Project API

Basic Information

Formula

Sc2AlCu

MP-ID

mp-972884

Elements

Sites

Density

4.0197

g/cm³

Volume

74.54

Å³

Cell a

4.7239

Cell b

4.7239

Cell c

4.7239

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

Stability

Packing Fraction

0.7405

X-ray Diffraction

Diffraction Pattern

Target / Radiation

X-axis: 2θ (°); Y-axis: relative intensity; Cu Kα ; λ=1.5418 Å

Diffraction Peaks (Top 9)

2θ	d (Å)	I	hkl
23.06	3.8571	12.5	(1,1,1)
38.10	2.3620	100.0	(2,1,1)
45.01	2.0143	6.4	(2,2,1)
54.98	1.6702	15.9	(2,2,0)
60.40	1.5326	2.4	(3,2,2)
68.85	1.3637	30.6	(3,3,2)
73.69	1.2857	1.6	(3,3,3)
81.50	1.1810	9.2	(4,2,2)
86.11	1.1292	1.5	(4,3,2)

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Energy Properties

Formation Energy/atom

-0.34795

eV/atom

Energy/atom

-10.44192

eV/atom

Energy above Hull

0.0210

eV/atom

Uncorrected Energy

-5.4702

eV/atom

Volume/atom

18.63

Å³

c/a Ratio

1.0000

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Total Mag. Moment

0.0000

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.000000

μB/Å³

Elastic Properties

K_VRH

81.231

GPa

G_VRH

38.357

GPa

Young's Modulus E

99.422

GPa

Poisson Ratio ν

0.296

Pugh Ratio K/G

2.118

Vickers Hardness Est.

GPa

Ductility

Brittle

Anisotropy

1.977

Lame λ

55.660

GPa

Feature Analysis

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Sc · 0.500

Element Family

3d-TM

Solute Fraction

0.500

Interstitial Fraction

0.000

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.0397

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

8.6442

J/mol·K

Ω Parameter

0.3850

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

9.595%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.2225

smaller = more stable mixing

VEC

5.000

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-33.226

kJ/mol; negative = exothermic mixing

Entropy Norm

0.9464

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (5)

aaadcvwq aaadnzeo aaadwpgf aaaetfav aaafcusi

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-972884

Reference Citation

The crystal structure and related material properties of Sc2AlCu were obtained from the Materials Project database (MP-ID: mp-972884, 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

3D Crystal Structure Rendering

Loading 3D structure…

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Raw CIF Data

# generated using pymatgen
data_Sc2AlCu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.72390039
_cell_length_b   4.72390039
_cell_length_c   4.72390039
_cell_angle_alpha   60.00000000
_cell_angle_beta   60.00000000
_cell_angle_gamma   60.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sc2AlCu
_chemical_formula_sum   'Sc2 Al1 Cu1'
_cell_volume   74.53962377
_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
  Sc  Sc0  1  0.25000000  0.25000000  0.25000000  1.0
  Sc  Sc1  1  0.75000000  0.75000000  0.75000000  1.0
  Al  Al2  1  0.50000000  0.50000000  0.50000000  1.0
  Cu  Cu3  1  0.00000000  0.00000000  0.00000000  1.0

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