Sc3Al8Os3Pb

High-Entropy Materials HEA

MP-ID: mp-3296620 · Space group: Pm-3m (#221)

Materials Project API

Basic Information

Formula

Sc3Al8Os3Pb

MP-ID

mp-3296620

Elements

Sites

Density

7.5020

g/cm³

Volume

249.81

Å³

Cell a

6.2980

Cell b

6.2980

Cell c

6.2980

α Angle

90.00

β Angle

90.00

γ Angle

90.00

Space Group

Pm-3m

Point Group

m-3m

Crystal System

Cubic

Bravais Lattice

Stability

Yes

Packing Fraction

0.5236

X-ray Diffraction

Diffraction Pattern

Target / Radiation

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

Diffraction Peaks (Top 15)

2θ	d (Å)	I	hkl
24.48	3.6362	83.9	(1,1,1)
28.34	3.1490	56.7	(2,0,0)
31.77	2.8166	4.2	(2,1,0)
40.51	2.2267	100.0	(2,2,0)
43.09	2.0993	1.7	(2,2,1)
47.90	1.8989	45.9	(3,1,1)
50.18	1.8181	17.9	(2,2,2)
58.63	1.5745	15.4	(4,0,0)
60.62	1.5275	1.7	(4,1,0)
64.49	1.4449	17.7	(3,3,1)
66.38	1.4083	25.8	(4,2,0)
73.69	1.2856	29.7	(4,2,2)
78.99	1.2121	15.0	(5,1,1)
82.47	1.1695	1.3	(4,3,2)
87.65	1.1133	9.3	(4,4,0)

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Energy Properties

Formation Energy/atom

-0.65452

eV/atom

Energy/atom

-20.87406

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-20.8741

eV/atom

Volume/atom

16.65

Å³

c/a Ratio

1.0000

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Total Mag. Moment

0.0003

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.000000

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Al · 0.533

Element Family

PostTransition-Noble

Solute Fraction

0.467

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.1596

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

9.6407

J/mol·K

Ω Parameter

0.7025

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

7.871%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.3213

smaller = more stable mixing

VEC

4.067

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-21.434

kJ/mol; negative = exothermic mixing

Entropy Norm

0.8365

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaahforc

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-3296620

Reference Citation

The crystal structure and related material properties of Sc3Al8Os3Pb were obtained from the Materials Project database (MP-ID: mp-3296620, 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

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Raw CIF Data

# generated using pymatgen
data_Sc3Al8Os3Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.29802789
_cell_length_b   6.29802789
_cell_length_c   6.29802789
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sc3Al8Os3Pb
_chemical_formula_sum   'Sc3 Al8 Os3 Pb1'
_cell_volume   249.81225452
_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  0.50000000  0.00000000  0.00000000  1.0
  Sc  Sc1  1  0.00000000  0.50000000  0.00000000  1.0
  Sc  Sc2  1  0.00000000  0.00000000  0.50000000  1.0
  Al  Al3  1  0.28902364  0.28902364  0.28902364  1.0
  Al  Al4  1  0.71097636  0.71097636  0.71097636  1.0
  Al  Al5  1  0.71097636  0.71097636  0.28902364  1.0
  Al  Al6  1  0.71097636  0.28902364  0.71097636  1.0
  Al  Al7  1  0.28902364  0.28902364  0.71097636  1.0
  Al  Al8  1  0.28902364  0.71097636  0.28902364  1.0
  Al  Al9  1  0.28902364  0.71097636  0.71097636  1.0
  Al  Al10  1  0.71097636  0.28902364  0.28902364  1.0
  Os  Os11  1  0.00000000  0.50000000  0.50000000  1.0
  Os  Os12  1  0.50000000  0.00000000  0.50000000  1.0
  Os  Os13  1  0.50000000  0.50000000  0.00000000  1.0
  Pb  Pb14  1  0.00000000  0.00000000  0.00000000  1.0

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