Ho(CoGe)6

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-1104175 · Space group: P6/mmm (#191)

Materials Project API

Basic Information

Formula

Ho(CoGe)6

MP-ID

mp-1104175

Elements

Sites

Density

8.9957

g/cm³

Volume

176.17

Å³

Cell a

5.0852

Cell b

5.0852

Cell c

7.8665

α Angle

90.00

β Angle

90.00

γ Angle

120.00

Space Group

P6/mmm

Point Group

6/mmm

Crystal System

Hexagonal

Bravais Lattice

Stability

Packing Fraction

0.7405

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
11.25	7.8665	11.6	(0,0,0,1)
20.16	4.4039	2.1	(1,0,-1,0)
23.15	3.8427	14.8	(1,0,-1,1)
30.47	2.9336	2.6	(1,-1,0,2)
30.47	2.9336	5.2	(1,0,-1,2)
34.20	2.6222	14.9	(0,0,0,3)
35.30	2.5426	100.0	(2,-1,-1,0)
37.16	2.4194	4.5	(2,-1,-1,1)
40.02	2.2530	56.0	(1,0,-1,3)
40.99	2.2020	78.0	(2,0,-2,0)
42.33	2.1353	47.0	(1,-2,1,2)
42.33	2.1353	94.0	(2,-1,-1,2)
42.64	2.1205	2.9	(2,0,-2,1)
46.16	1.9666	33.9	(0,0,0,4)
47.31	1.9214	60.5	(2,0,-2,2)
49.96	1.8254	9.8	(1,-2,1,3)
49.96	1.8254	19.6	(2,-1,-1,3)
50.85	1.7957	13.5	(1,0,-1,4)
54.41	1.6863	7.8	(2,-2,0,3)
54.41	1.6863	15.7	(2,0,-2,3)
56.51	1.6285	2.3	(3,-1,-2,1)
59.42	1.5556	10.2	(2,-1,-1,4)
60.39	1.5329	1.0	(3,-2,-1,2)
60.39	1.5329	1.0	(3,-1,-2,2)

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Energy Properties

Formation Energy/atom

-0.33708

eV/atom

Energy/atom

-6.11680

eV/atom

Energy above Hull

0.0183

eV/atom

Uncorrected Energy

-6.1168

eV/atom

Volume/atom

13.55

Å³

c/a Ratio

1.5469

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Total Mag. Moment

0.0387

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.000220

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Co · 0.462

Element Family

3d-TM

Solute Fraction

0.538

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.9110

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

7.5742

J/mol·K

Ω Parameter

3.8788

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

10.341%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.2005

smaller = more stable mixing

VEC

6.846

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

2.946

kJ/mol; negative = exothermic mixing

Entropy Norm

0.8292

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.679

Family

Co-based Alloy

Matrix Element

Co · 0.462

Related Tasks

Related computation task IDs (1)

aaaeixlz

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-1104175

Reference Citation

The crystal structure and related material properties of Ho(CoGe)6 were obtained from the Materials Project database (MP-ID: mp-1104175, 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_Ho(CoGe)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.08521700
_cell_length_b   5.08521716
_cell_length_c   7.86648200
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   120.00000547
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ho(CoGe)6
_chemical_formula_sum   'Ho1 Co6 Ge6'
_cell_volume   176.16927005
_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  0.00000000  0.00000000  0.00000000  1.0
  Co  Co1  1  0.50000000  0.50000000  0.74943800  1.0
  Co  Co2  1  0.50000000  0.00000000  0.74943800  1.0
  Co  Co3  1  0.00000000  0.50000000  0.74943800  1.0
  Co  Co4  1  0.50000000  0.50000000  0.25056200  1.0
  Co  Co5  1  0.50000000  0.00000000  0.25056200  1.0
  Co  Co6  1  0.00000000  0.50000000  0.25056200  1.0
  Ge  Ge7  1  0.66666700  0.33333300  0.00000000  1.0
  Ge  Ge8  1  0.33333300  0.66666700  0.00000000  1.0
  Ge  Ge9  1  0.66666700  0.33333300  0.50000000  1.0
  Ge  Ge10  1  0.33333300  0.66666700  0.50000000  1.0
  Ge  Ge11  1  0.00000000  0.00000000  0.65555700  1.0
  Ge  Ge12  1  0.00000000  0.00000000  0.34444300  1.0

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