Ho6Al17Si7Os8

High-Entropy Materials HEA

MP-ID: mp-3293143 · Space group: Pm (#6)

Materials Project API

Basic Information

Formula

Ho6Al17Si7Os8

MP-ID

mp-3293143

Elements

Sites

Density

8.6568

g/cm³

Volume

607.44

Å³

Cell a

8.6410

Cell b

8.6295

Cell c

9.4185

α Angle

90.00

β Angle

90.00

γ Angle

120.13

Space Group

Point Group

Crystal System

Monoclinic

Bravais Lattice

Stability

Yes

Packing Fraction

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
15.12	5.8590	17.1	(1,-1,1)
15.13	5.8545	16.6	(1,0,1)
15.15	5.8497	15.9	(0,1,1)
18.84	4.7093	19.4	(0,0,2)
20.56	4.3205	1.1	(2,-1,0)
20.58	4.3147	1.2	(1,-2,0)
20.61	4.3093	1.3	(1,1,0)
23.78	3.7416	30.8	(2,-2,0)
23.81	3.7369	30.6	(2,0,0)
23.84	3.7319	30.8	(0,2,0)
25.62	3.4772	20.4	(2,-2,1)
25.65	3.4735	20.4	(2,0,1)
25.68	3.4694	21.4	(0,2,1)
28.03	3.1836	1.9	(2,-1,2)
28.05	3.1813	2.0	(1,-2,2)
28.07	3.1791	2.2	(1,1,2)
30.52	2.9295	99.3	(2,-2,2)
30.54	2.9272	100.0	(2,0,2)
30.57	2.9248	99.7	(0,2,2)
30.89	2.8950	4.3	(1,-1,3)
30.89	2.8945	4.2	(1,0,3)
30.90	2.8939	4.0	(0,1,3)
31.63	2.8289	4.4	(3,-2,0)
31.65	2.8274	4.3	(3,-1,0)

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Energy Properties

Formation Energy/atom

-0.73927

eV/atom

Energy/atom

-21.71380

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-21.7138

eV/atom

Volume/atom

15.99

Å³

c/a Ratio

1.0900

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 · 0.447

Element Family

PostTransition-Noble

Solute Fraction

0.553

Interstitial Fraction

0.184

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.2910

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

10.7330

J/mol·K

Ω Parameter

3.3176

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

12.186%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.3126

smaller = more stable mixing

VEC

5.500

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-5.494

kJ/mol; negative = exothermic mixing

Entropy Norm

0.9312

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaahfjnj

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-3293143

Reference Citation

The crystal structure and related material properties of Ho6Al17Si7Os8 were obtained from the Materials Project database (MP-ID: mp-3293143, 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_Ho6Al17Si7Os8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.64103190
_cell_length_b   8.62945393
_cell_length_c   9.41850733
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   120.12753184
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ho6Al17Si7Os8
_chemical_formula_sum   'Ho6 Al17 Si7 Os8'
_cell_volume   607.43818482
_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  0.19307466  0.38815270  0.25000000  1.0
  Ho  Ho1  1  0.80669151  0.61363339  0.75000000  1.0
  Ho  Ho2  1  0.61090372  0.80705313  0.25000000  1.0
  Ho  Ho3  1  0.38829028  0.19139840  0.75000000  1.0
  Ho  Ho4  1  0.19604370  0.80561902  0.25000000  1.0
  Ho  Ho5  1  0.80259406  0.19195627  0.75000000  1.0
  Al  Al6  1  0.16459353  0.33036717  0.57779519  1.0
  Al  Al7  1  0.83413720  0.67041698  0.42098809  1.0
  Al  Al8  1  0.67049403  0.83495283  0.57715002  1.0
  Al  Al9  1  0.83413720  0.67041698  0.07901191  1.0
  Al  Al10  1  0.33039599  0.16591305  0.42242491  1.0
  Al  Al11  1  0.16459353  0.33036717  0.92220481  1.0
  Al  Al12  1  0.16421944  0.83419295  0.57598346  1.0
  Al  Al13  1  0.33039599  0.16591305  0.07757509  1.0
  Al  Al14  1  0.83499638  0.16432890  0.42196492  1.0
  Al  Al15  1  0.67049403  0.83495283  0.92284998  1.0
  Al  Al16  1  0.83499638  0.16432890  0.07803508  1.0
  Al  Al17  1  0.16421944  0.83419295  0.92401654  1.0
  Al  Al18  1  0.12628781  0.56589281  0.75000000  1.0
  Al  Al19  1  0.56467153  0.43482500  0.25000000  1.0
  Al  Al20  1  0.43838914  0.56658990  0.75000000  1.0
  Al  Al21  1  0.99976392  0.99892078  0.25000000  1.0
  Al  Al22  1  0.99987300  0.00126399  0.75000000  1.0
  Si  Si23  1  0.33323348  0.66432322  0.03888827  1.0
  Si  Si24  1  0.66634851  0.33585324  0.96001477  1.0
  Si  Si25  1  0.66634851  0.33585324  0.53998523  1.0
  Si  Si26  1  0.33323348  0.66432322  0.46111173  1.0
  Si  Si27  1  0.56516039  0.12520411  0.25000000  1.0
  Si  Si28  1  0.43605068  0.87245035  0.75000000  1.0
  Si  Si29  1  0.87437731  0.43467718  0.25000000  1.0
  Os  Os30  1  0.50097555  0.00118795  0.00093083  1.0
  Os  Os31  1  0.99823725  0.49925771  0.00655074  1.0
  Os  Os32  1  0.50097555  0.00118795  0.49906917  1.0
  Os  Os33  1  0.50072344  0.50006809  0.00029286  1.0
  Os  Os34  1  0.99823725  0.49925771  0.49344926  1.0
  Os  Os35  1  0.50072344  0.50006809  0.49970714  1.0
  Os  Os36  1  0.00055936  0.00031740  0.99985069  1.0
  Os  Os37  1  0.00055936  0.00031740  0.50014931  1.0

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