Ho4Al3Zn3Pt8

High-Entropy Materials HEA

MP-ID: mp-3292265 · Space group: C2 (#5)

Materials Project API

Basic Information

Formula

Ho4Al3Zn3Pt8

MP-ID

mp-3292265

Elements

Sites

Density

13.1895

g/cm³

Volume

314.44

Å³

Cell a

8.0595

Cell b

8.0595

Cell c

7.4813

α Angle

90.00

β Angle

90.00

γ Angle

139.68

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
11.70	7.5657	1.2	(1,-1,0)
16.67	5.3196	5.0	(1,-1,1)
23.52	3.7828	14.3	(2,-2,0)
26.40	3.3758	44.3	(2,-2,1)
26.58	3.3532	50.0	(1,-1,2)
26.68	3.3412	9.7	(1,-2,-1)
26.68	3.3412	9.7	(2,-1,1)
26.68	3.3412	21.9	(2,-1,-1)
29.39	3.0395	4.1	(1,0,-2)
32.23	2.7777	7.2	(1,1,0)
33.70	2.6598	13.8	(2,-2,-2)
33.70	2.6598	13.8	(2,-2,2)
33.92	2.6428	24.4	(2,-1,2)
33.92	2.6428	16.5	(2,-1,-2)
34.39	2.6075	11.1	(0,2,0)
34.39	2.6075	11.1	(2,0,0)
35.60	2.5219	1.3	(3,-3,0)
35.86	2.5043	31.4	(2,-3,-1)
35.86	2.5043	31.4	(3,-2,1)
35.86	2.5042	37.0	(2,-3,1)
35.86	2.5042	37.0	(3,-2,-1)
36.49	2.4623	60.4	(2,0,1)
36.49	2.4622	44.1	(2,0,-1)
37.64	2.3898	49.6	(3,-3,1)

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Energy Properties

Formation Energy/atom

-1.16772

eV/atom

Energy/atom

-33.96524

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-33.9652

eV/atom

Volume/atom

17.47

Å³

c/a Ratio

0.9283

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Total Mag. Moment

0.0009

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

Pt · 0.444

Element Family

5d-TM

Solute Fraction

0.556

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.2919

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

10.7409

J/mol·K

Ω Parameter

0.8380

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

10.406%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.4283

smaller = more stable mixing

VEC

9.389

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-20.040

kJ/mol; negative = exothermic mixing

Entropy Norm

0.9319

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaahfifp

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-3292265

Reference Citation

The crystal structure and related material properties of Ho4Al3Zn3Pt8 were obtained from the Materials Project database (MP-ID: mp-3292265, 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_Ho4Al3Zn3Pt8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.05944990
_cell_length_b   8.05945081
_cell_length_c   7.48126026
_cell_angle_alpha   89.99921613
_cell_angle_beta   89.99922203
_cell_angle_gamma   139.67883715
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ho4Al3Zn3Pt8
_chemical_formula_sum   'Ho4 Al3 Zn3 Pt8'
_cell_volume   314.44003854
_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  0.10515663  0.88799171  0.40967212  1.0
  Ho  Ho1  1  0.89319868  0.11168486  0.59358740  1.0
  Ho  Ho2  1  0.38831514  0.60680132  0.90641260  1.0
  Ho  Ho3  1  0.61200829  0.39484337  0.09032788  1.0
  Al  Al4  1  0.99924471  0.99971340  0.99982820  1.0
  Al  Al5  1  0.50028660  0.50075529  0.50017180  1.0
  Al  Al6  1  0.52271086  0.97728914  0.25000000  1.0
  Zn  Zn7  1  0.02105180  0.47894820  0.25000000  1.0
  Zn  Zn8  1  0.47856444  0.02143556  0.75000000  1.0
  Zn  Zn9  1  0.97881746  0.52118254  0.75000000  1.0
  Pt  Pt10  1  0.19329629  0.30670371  0.25000000  1.0
  Pt  Pt11  1  0.30693696  0.19306304  0.75000000  1.0
  Pt  Pt12  1  0.80774076  0.69225924  0.75000000  1.0
  Pt  Pt13  1  0.69066343  0.80933657  0.25000000  1.0
  Pt  Pt14  1  0.18831337  0.83270189  0.03128040  1.0
  Pt  Pt15  1  0.81770730  0.17131183  0.97609359  1.0
  Pt  Pt16  1  0.32868817  0.68229270  0.52390641  1.0
  Pt  Pt17  1  0.66729811  0.31168663  0.46871960  1.0

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