Ho4ScPt9

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-3292879 · Space group: P4_2/mnm (#136)

Materials Project API

Basic Information

Formula

Ho4ScPt9

MP-ID

mp-3292879

Elements

Sites

Density

15.5510

g/cm³

Volume

525.45

Å³

Cell a

9.6124

Cell b

9.6124

Cell c

5.6869

α Angle

90.00

β Angle

90.00

γ Angle

90.00

Space Group

P4_2/mnm

Point Group

4/mmm

Crystal System

Tetragonal

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
18.46	4.8062	17.9	(2,0,0)
20.36	4.3616	2.1	(1,1,1)
20.66	4.2988	5.8	(2,1,0)
25.98	3.4293	9.3	(2,1,1)
26.22	3.3985	4.5	(2,2,0)
29.38	3.0397	8.9	(3,1,0)
31.46	2.8434	14.2	(0,0,2)
32.06	2.7915	6.7	(3,0,1)
33.62	2.6660	8.7	(3,2,0)
34.18	2.6232	2.6	(1,1,2)
36.72	2.4472	25.6	(2,0,2)
37.25	2.4139	6.3	(3,2,1)
37.42	2.4031	12.2	(4,0,0)
37.94	2.3716	57.9	(2,1,2)
38.62	2.3313	100.0	(4,1,0)
39.79	2.2657	36.7	(3,3,0)
41.40	2.1808	40.2	(2,2,2)
41.88	2.1571	1.7	(4,1,1)
42.04	2.1494	4.0	(4,2,0)
42.97	2.1048	5.0	(3,3,1)
43.59	2.0765	41.9	(3,1,2)
46.71	1.9448	32.5	(3,2,2)
47.28	1.9225	2.5	(4,3,0)
49.67	1.8354	9.1	(4,0,2)

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Energy Properties

Formation Energy/atom

-1.29549

eV/atom

Energy/atom

-44.60358

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-44.6036

eV/atom

Volume/atom

18.77

Å³

c/a Ratio

0.5916

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Total Mag. Moment

0.0028

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.000010

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Pt · 0.643

Element Family

5d-TM

Solute Fraction

0.357

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.8305

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

6.9045

J/mol·K

Ω Parameter

0.9839

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

10.802%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.4916

smaller = more stable mixing

VEC

9.786

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-13.593

kJ/mol; negative = exothermic mixing

Entropy Norm

0.7559

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.565

Family

Pt-rich Multi-Component

Matrix Element

Pt · 0.643

Related Tasks

Related computation task IDs (1)

aaahfjdf

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-3292879

Reference Citation

The crystal structure and related material properties of Ho4ScPt9 were obtained from the Materials Project database (MP-ID: mp-3292879, 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_Ho4ScPt9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.61234586
_cell_length_b   9.61234586
_cell_length_c   5.68686462
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ho4ScPt9
_chemical_formula_sum   'Ho8 Sc2 Pt18'
_cell_volume   525.45032732
_cell_formula_units_Z   2
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  0.45241458  0.80977947  0.00000000  1.0
  Ho  Ho1  1  0.54758542  0.19022053  0.00000000  1.0
  Ho  Ho2  1  0.19022053  0.54758542  0.00000000  1.0
  Ho  Ho3  1  0.80977947  0.45241458  0.00000000  1.0
  Ho  Ho4  1  0.30977947  0.04758542  0.50000000  1.0
  Ho  Ho5  1  0.69022053  0.95241458  0.50000000  1.0
  Ho  Ho6  1  0.95241458  0.69022053  0.50000000  1.0
  Ho  Ho7  1  0.04758542  0.30977947  0.50000000  1.0
  Sc  Sc8  1  0.50000000  0.50000000  0.50000000  1.0
  Sc  Sc9  1  0.00000000  0.00000000  0.00000000  1.0
  Pt  Pt10  1  0.18917874  0.81082126  0.24947850  1.0
  Pt  Pt11  1  0.81082126  0.18917874  0.75052150  1.0
  Pt  Pt12  1  0.81082126  0.18917874  0.24947850  1.0
  Pt  Pt13  1  0.18917874  0.81082126  0.75052150  1.0
  Pt  Pt14  1  0.43912693  0.77535215  0.50000000  1.0
  Pt  Pt15  1  0.56087307  0.22464785  0.50000000  1.0
  Pt  Pt16  1  0.22464785  0.56087307  0.50000000  1.0
  Pt  Pt17  1  0.77535215  0.43912693  0.50000000  1.0
  Pt  Pt18  1  0.31082126  0.31082126  0.25052150  1.0
  Pt  Pt19  1  0.68917874  0.68917874  0.74947850  1.0
  Pt  Pt20  1  0.68917874  0.68917874  0.25052150  1.0
  Pt  Pt21  1  0.31082126  0.31082126  0.74947850  1.0
  Pt  Pt22  1  0.27535215  0.06087307  0.00000000  1.0
  Pt  Pt23  1  0.72464785  0.93912693  0.00000000  1.0
  Pt  Pt24  1  0.93912693  0.72464785  0.00000000  1.0
  Pt  Pt25  1  0.06087307  0.27535215  0.00000000  1.0
  Pt  Pt26  1  0.00000000  0.00000000  0.50000000  1.0
  Pt  Pt27  1  0.50000000  0.50000000  0.00000000  1.0

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