Ho6Sc4Al12Ir7

High-Entropy Materials HEA

MP-ID: mp-3295073 · Space group: F-43m (#216)

Materials Project API

Basic Information

Formula

Ho6Sc4Al12Ir7

MP-ID

mp-3295073

Elements

Sites

Density

9.0189

g/cm³

Volume

522.66

Å³

Cell a

9.0416

Cell b

9.0416

Cell c

9.0416

α Angle

60.00

β Angle

60.00

γ Angle

60.00

Space Group

F-43m

Point Group

-43m

Crystal System

Cubic

Bravais Lattice

Stability

Yes

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 24)

2θ	d (Å)	I	hkl
13.85	6.3934	1.1	(1,1,0)
19.64	4.5208	17.0	(2,1,1)
23.07	3.8553	8.2	(2,1,0)
24.11	3.6912	12.9	(2,2,2)
27.91	3.1967	91.5	(2,2,0)
30.47	2.9335	32.3	(3,2,2)
34.36	2.6101	9.5	(0,3,1)
34.36	2.6101	19.1	(2,-1,-1)
36.51	2.4608	37.2	(3,3,3)
39.88	2.2604	100.0	(4,2,2)
39.88	2.2604	20.0	(2,0,-2)
41.79	2.1614	2.9	(4,2,1)
42.41	2.1311	5.5	(3,3,4)
44.83	2.0218	1.5	(4,3,1)
47.15	1.9277	23.6	(4,2,0)
49.38	1.8456	13.6	(4,4,4)
49.38	1.8456	4.5	(0,0,4)
51.01	1.7905	7.1	(3,0,-2)
53.64	1.7087	1.4	(5,2,1)
55.17	1.6647	13.2	(5,4,4)
55.17	1.6647	2.1	(1,1,5)
57.67	1.5983	14.7	(4,4,0)
59.14	1.5621	2.3	(0,5,2)
59.14	1.5621	11.7	(5,5,3)

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Energy Properties

Formation Energy/atom

-0.98099

eV/atom

Energy/atom

-24.78039

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-24.7804

eV/atom

Volume/atom

18.02

Å³

c/a Ratio

1.0000

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Total Mag. Moment

0.0403

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.000080

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Al · 0.414

Element Family

PostTransition-Noble

Solute Fraction

0.586

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.3074

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

10.8700

J/mol·K

Ω Parameter

0.8652

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

9.772%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.3488

smaller = more stable mixing

VEC

6.103

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-20.810

kJ/mol; negative = exothermic mixing

Entropy Norm

0.9431

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaahfmjp

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-3295073

Reference Citation

The crystal structure and related material properties of Ho6Sc4Al12Ir7 were obtained from the Materials Project database (MP-ID: mp-3295073, 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_Ho6Sc4Al12Ir7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.04156642
_cell_length_b   9.04156683
_cell_length_c   9.04156616
_cell_angle_alpha   59.99999525
_cell_angle_beta   59.99999374
_cell_angle_gamma   59.99999942
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ho6Sc4Al12Ir7
_chemical_formula_sum   'Ho6 Sc4 Al12 Ir7'
_cell_volume   522.65607457
_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
  Ho  Ho0  1  0.70446512  0.70446512  0.29553488  1.0
  Ho  Ho1  1  0.29553488  0.70446512  0.29553488  1.0
  Ho  Ho2  1  0.70446512  0.29553488  0.29553488  1.0
  Ho  Ho3  1  0.29553488  0.29553488  0.70446512  1.0
  Ho  Ho4  1  0.70446512  0.29553488  0.70446512  1.0
  Ho  Ho5  1  0.29553488  0.70446512  0.70446512  1.0
  Sc  Sc6  1  0.88107636  0.88107636  0.35677193  1.0
  Sc  Sc7  1  0.88107636  0.35677193  0.88107636  1.0
  Sc  Sc8  1  0.35677193  0.88107636  0.88107636  1.0
  Sc  Sc9  1  0.88107636  0.88107636  0.88107636  1.0
  Al  Al10  1  0.12052439  0.12052439  0.63842682  1.0
  Al  Al11  1  0.12052439  0.63842682  0.12052439  1.0
  Al  Al12  1  0.63842682  0.12052439  0.12052439  1.0
  Al  Al13  1  0.12052439  0.12052439  0.12052439  1.0
  Al  Al14  1  0.66923589  0.66923589  0.99229332  1.0
  Al  Al15  1  0.66923589  0.99229332  0.66923589  1.0
  Al  Al16  1  0.99229332  0.66923589  0.66923589  1.0
  Al  Al17  1  0.66923589  0.66923589  0.66923589  1.0
  Al  Al18  1  0.32928423  0.32928423  0.01214830  1.0
  Al  Al19  1  0.32928423  0.01214830  0.32928423  1.0
  Al  Al20  1  0.01214830  0.32928423  0.32928423  1.0
  Al  Al21  1  0.32928423  0.32928423  0.32928423  1.0
  Ir  Ir22  1  0.00000000  0.00000000  0.00000000  1.0
  Ir  Ir23  1  0.00192431  0.00192431  0.49807569  1.0
  Ir  Ir24  1  0.49807569  0.00192431  0.49807569  1.0
  Ir  Ir25  1  0.00192431  0.49807569  0.49807569  1.0
  Ir  Ir26  1  0.49807569  0.49807569  0.00192431  1.0
  Ir  Ir27  1  0.00192431  0.49807569  0.00192431  1.0
  Ir  Ir28  1  0.49807569  0.00192431  0.00192431  1.0

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