Ho7Tm3Co4

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-3292996 · Space group: P1 (#1)

Materials Project API

Basic Information

Formula

Ho7Tm3Co4

MP-ID

mp-3292996

Elements

Sites

Density

9.5210

g/cm³

Volume

330.86

Å³

Cell a

6.2392

Cell b

6.7917

Cell c

8.4465

α Angle

95.74

β Angle

111.60

γ Angle

90.00

Space Group

Point Group

Crystal System

Triclinic

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
15.29	5.7966	1.6	(1,0,0)
15.30	5.7911	1.3	(1,0,-1)
20.59	4.3140	3.0	(1,1,0)
20.60	4.3115	2.6	(1,-1,-1)
24.92	3.5732	2.6	(1,-1,1)
24.95	3.5695	2.7	(1,1,-2)
26.40	3.3761	10.4	(0,2,0)
26.83	3.3230	10.2	(1,1,1)
26.86	3.3197	10.1	(1,-1,-2)
27.63	3.2280	11.7	(0,2,-1)
28.61	3.1196	24.0	(2,0,-1)
29.94	2.9841	40.7	(0,2,1)
30.10	2.9693	35.7	(1,-2,0)
30.10	2.9688	35.4	(1,2,-1)
30.85	2.8983	1.8	(2,0,0)
30.88	2.8955	1.9	(2,0,-2)
31.19	2.8681	10.4	(1,2,0)
31.19	2.8672	9.9	(1,-2,-1)
31.59	2.8320	62.3	(2,1,-1)
31.59	2.8319	61.9	(2,-1,-1)
32.03	2.7944	100.0	(1,0,2)
32.07	2.7913	99.1	(1,0,-3)
33.15	2.7027	23.3	(2,-1,0)
33.16	2.7016	47.4	(0,2,-2)

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Energy Properties

Formation Energy/atom

-0.11478

eV/atom

Energy/atom

-27.86260

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-27.8626

eV/atom

Volume/atom

23.63

Å³

c/a Ratio

1.3538

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Total Mag. Moment

0.0158

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.000050

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Ho · 0.500

Element Family

Lanthanide

Solute Fraction

0.500

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.0346

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

8.6017

J/mol·K

Ω Parameter

0.0000

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

14.055%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.2910

smaller = more stable mixing

VEC

10.857

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

0.000

kJ/mol; negative = exothermic mixing

Entropy Norm

0.9417

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.476

Family

Ho-rich Multi-Component

Matrix Element

Ho · 0.500

Related Tasks

Related computation task IDs (1)

aaahfjhs

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-3292996

Reference Citation

The crystal structure and related material properties of Ho7Tm3Co4 were obtained from the Materials Project database (MP-ID: mp-3292996, 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_Ho7Tm3Co4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.23915576
_cell_length_b   6.79165210
_cell_length_c   8.44653791
_cell_angle_alpha   95.74071486
_cell_angle_beta   111.59527743
_cell_angle_gamma   90.00404959
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ho7Tm3Co4
_chemical_formula_sum   'Ho7 Tm3 Co4'
_cell_volume   330.85956290
_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  0.79537817  0.08810901  0.81150963  1.0
  Ho  Ho1  1  0.98480154  0.41222058  0.18955241  1.0
  Ho  Ho2  1  0.20448025  0.91098101  0.18988944  1.0
  Ho  Ho3  1  0.01568601  0.58857251  0.80965579  1.0
  Ho  Ho4  1  0.21883760  0.18336592  0.57065842  1.0
  Ho  Ho5  1  0.64716835  0.31705522  0.43005717  1.0
  Ho  Ho6  1  0.78255553  0.81719027  0.42950535  1.0
  Tm  Tm7  1  0.35404874  0.68299570  0.57092984  1.0
  Tm  Tm8  1  0.43143161  0.24977651  0.99994485  1.0
  Tm  Tm9  1  0.56724291  0.74965377  0.99952420  1.0
  Co  Co10  1  0.60432584  0.42972977  0.77773851  1.0
  Co  Co11  1  0.82553655  0.07082175  0.22001942  1.0
  Co  Co12  1  0.39553046  0.57105308  0.22466825  1.0
  Co  Co13  1  0.17297544  0.92847590  0.77634872  1.0

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