Ho4Al6(Ga2Pt)9
High-Entropy Materials HEAMP-ID: mp-3293363 · Space group: P-1 (#2)
Basic Information
Formula
Ho4Al6(Ga2Pt)9
MP-ID
mp-3293363
Elements
4
Sites
37
Density
10.1903
g/cm³
Volume
624.50
ų
Cell a
7.4632
Å
Cell b
7.4563
Å
Cell c
13.2008
Å
α Angle
84.49
°
β Angle
79.02
°
γ Angle
59.99
°
Space Group
P-1
Point Group
-1
Crystal System
Triclinic
Bravais Lattice
aP
Stability
Yes
Packing Fraction
-
X-ray Diffraction
Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; Cu Kα ; λ=1.5418 Å
Diffraction Peaks (Top 24)
| 2θ | d (Å) | I | hkl |
|---|---|---|---|
| 6.82 | 12.9593 | 7.6 | (0,0,1) |
| 13.67 | 6.4797 | 3.6 | (0,0,2) |
| 13.71 | 6.4569 | 4.8 | (0,1,0) |
| 14.44 | 6.1348 | 3.5 | (1,1,1) |
| 15.33 | 5.7814 | 2.1 | (0,1,1) |
| 15.34 | 5.7772 | 1.0 | (0,1,-1) |
| 17.84 | 4.9733 | 3.0 | (1,0,2) |
| 20.56 | 4.3198 | 57.2 | (0,0,3) |
| 23.95 | 3.7152 | 40.2 | (2,1,1) |
| 23.97 | 3.7124 | 38.2 | (1,-1,0) |
| 23.98 | 3.7105 | 38.3 | (1,2,0) |
| 25.61 | 3.4788 | 1.0 | (1,2,-1) |
| 26.50 | 3.3640 | 6.3 | (1,2,2) |
| 26.50 | 3.3630 | 6.5 | (1,-1,2) |
| 26.52 | 3.3616 | 6.7 | (2,1,-1) |
| 27.53 | 3.2398 | 10.2 | (0,0,4) |
| 27.63 | 3.2285 | 2.8 | (0,2,0) |
| 27.70 | 3.2206 | 1.9 | (2,0,1) |
| 27.71 | 3.2198 | 1.4 | (2,2,1) |
| 28.00 | 3.1870 | 2.0 | (2,0,0) |
| 28.01 | 3.1855 | 1.9 | (2,2,0) |
| 28.49 | 3.1334 | 3.3 | (0,2,1) |
| 28.50 | 3.1321 | 2.3 | (0,2,-1) |
| 28.77 | 3.1035 | 1.0 | (1,1,4) |
Energy Properties
Formation Energy/atom
-0.84811
eV/atom
Energy/atom
-23.58534
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-23.5853
eV/atom
Volume/atom
16.88
ų
c/a Ratio
1.7688
Electronic Properties
Metallic
Metal
Band Gap
0
eV
Direct Gap
No
CBM
N/A
eV
Magnetic Properties
Magnetic
No
Total Mag. Moment
0.0017
μB
Mag. Ordering
NM
Mag. Sites
0
Magnetization/Volume
0.000000
μB/ų
Elastic Properties
Elastic data not available
Feature Analysis
Composition Overview
Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Ga · 0.486
Element Family
PostTransition-Noble
Solute Fraction
0.514
Interstitial Fraction
0.000
High-Entropy Alloy Features
Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.2299
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
10.2254
J/mol·K
Ω Parameter
0.5690
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
8.468%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.3102
smaller = more stable mixing
VEC
5.568
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-17.658
kJ/mol; negative = exothermic mixing
Entropy Norm
0.8872
SS Former
0
Phase Tendency
AM
Related Tasks
Related computation task IDs (1)
Citation & References
Materials Project Page
https://materialsproject.org/materials/mp-3293363
Reference Citation
The crystal structure and related material properties of Ho4Al6(Ga2Pt)9 were obtained from the Materials Project database (MP-ID: mp-3293363, 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_Ho4Al6(Ga2Pt)9
_symmetry_space_group_name_H-M 'P 1'
_cell_length_a 7.46315413
_cell_length_b 7.45632983
_cell_length_c 13.20079048
_cell_angle_alpha 84.49245455
_cell_angle_beta 79.02442826
_cell_angle_gamma 59.99298147
_symmetry_Int_Tables_number 1
_chemical_formula_structural Ho4Al6(Ga2Pt)9
_chemical_formula_sum 'Ho4 Al6 Ga18 Pt9'
_cell_volume 624.49609266
_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 0.39255541 0.16922266 0.80824721 1.0
Ho Ho1 1 0.60744459 0.83077734 0.19175279 1.0
Ho Ho2 1 0.73083769 0.49775047 0.80908744 1.0
Ho Ho3 1 0.26916231 0.50224953 0.19091256 1.0
Al Al4 1 0.68612570 0.83423365 0.94651665 1.0
Al Al5 1 0.31387430 0.16576635 0.05348335 1.0
Al Al6 1 0.14600562 0.83317062 0.56062467 1.0
Al Al7 1 0.85399438 0.16682938 0.43937533 1.0
Al Al8 1 0.48102224 0.16634431 0.55811475 1.0
Al Al9 1 0.51897776 0.83365569 0.44188525 1.0
Ga Ga10 1 0.22265188 0.16600588 0.32605251 1.0
Ga Ga11 1 0.77734812 0.83399412 0.67394749 1.0
Ga Ga12 1 0.43925696 0.50364269 0.67205407 1.0
Ga Ga13 1 0.56074304 0.49635731 0.32794593 1.0
Ga Ga14 1 0.10800675 0.16289592 0.67183145 1.0
Ga Ga15 1 0.89199325 0.83710408 0.32816855 1.0
Ga Ga16 1 0.35430860 0.49780495 0.93981551 1.0
Ga Ga17 1 0.64569140 0.50219505 0.06018449 1.0
Ga Ga18 1 0.01821385 0.16744189 0.94118113 1.0
Ga Ga19 1 0.98178615 0.83255811 0.05881887 1.0
Ga Ga20 1 0.18680452 0.49791847 0.44283906 1.0
Ga Ga21 1 0.81319548 0.50208153 0.55716094 1.0
Ga Ga22 1 0.73401674 0.16850815 0.18401932 1.0
Ga Ga23 1 0.26598326 0.83149185 0.81598068 1.0
Ga Ga24 1 0.05415170 0.63506853 0.81658415 1.0
Ga Ga25 1 0.94584830 0.36493147 0.18341585 1.0
Ga Ga26 1 0.85411610 0.03946642 0.81654596 1.0
Ga Ga27 1 0.14588390 0.96053358 0.18345404 1.0
Pt Pt28 1 0.12262652 0.49432130 0.63856329 1.0
Pt Pt29 1 0.87737348 0.50567870 0.36143671 1.0
Pt Pt30 1 0.65606126 0.16784373 0.00157560 1.0
Pt Pt31 1 0.34393874 0.83215627 0.99842440 1.0
Pt Pt32 1 0.54211122 0.16421608 0.36426322 1.0
Pt Pt33 1 0.45788878 0.83578392 0.63573678 1.0
Pt Pt34 1 0.78242687 0.17062211 0.63446115 1.0
Pt Pt35 1 0.21757313 0.82937789 0.36553885 1.0
Pt Pt36 1 0.00000000 0.50000000 0.00000000 1.0
