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Ho3(CoGe2)2

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-1078740 · Space group: C2/m (#12)

Basic Information

Formula
Ho3(CoGe2)2
MP-ID
mp-1078740
Elements
3
Sites
9
Density
9.1438
g/cm³
Volume
164.03
ų
Cell a
5.6748
Å
Cell b
5.6748
Å
Cell c
7.9319
Å
α Angle
73.64
°
β Angle
73.64
°
γ Angle
42.35
°
Space Group
C2/m
Point Group
2/m
Crystal System
Monoclinic
Bravais Lattice
Monoclinic C
Stability
No
Packing Fraction
0.5240

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
11.70 7.5614 2.2 (0,0,1)
17.95 4.9417 1.9 (1,1,1)
23.98 3.7107 14.7 (1,1,-1)
24.80 3.5902 10.0 (1,1,2)
25.01 3.5601 43.6 (1,0,1)
31.43 2.8461 4.7 (1,0,2)
33.73 2.6569 91.6 (2,1,1)
33.90 2.6444 16.3 (2,2,1)
34.50 2.6000 96.3 (2,1,0)
34.65 2.5889 41.3 (1,1,3)
35.35 2.5390 100.0 (1,0,-2)
35.59 2.5223 4.8 (2,2,0)
35.62 2.5205 49.7 (0,0,3)
36.36 2.4708 14.9 (2,2,2)
37.11 2.4227 12.9 (2,1,2)
39.18 2.2992 15.3 (2,1,-1)
40.65 2.2196 15.6 (1,0,3)
41.00 2.2014 26.1 (2,2,-1)
42.35 2.1341 6.1 (2,2,3)
43.80 2.0669 57.6 (2,1,3)
44.19 2.0497 63.3 (1,-1,0)
44.79 2.0235 6.8 (1,1,-3)
45.39 1.9980 6.4 (1,0,-3)
46.80 1.9411 11.8 (2,1,-2)
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Energy Properties

Formation Energy/atom
-0.70638
eV/atom
Energy/atom
-5.87882
eV/atom
Energy above Hull
0.0046
eV/atom
Uncorrected Energy
-20.7914
eV/atom
Volume/atom
18.23
ų
c/a Ratio
-

Electronic Properties

Metallic
Metal
Band Gap
0
eV
Direct Gap
No
CBM
N/A
eV

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
0.0000
μB
Mag. Ordering
Unknown
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
Ge · 0.444
Element Family
PostTransition-Noble
Solute Fraction
0.556
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0609
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.8200
J/mol·K
Ω Parameter
9.7468
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
16.638%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.3509
smaller = more stable mixing
VEC
7.444
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
1.366
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9656
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
C
Score
0.431
Family
Ge-rich Multi-Component
Matrix Element
Ge · 0.444

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1078740
Reference Citation

The crystal structure and related material properties of Ho3(CoGe2)2 were obtained from the Materials Project database (MP-ID: mp-1078740, 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

BibTeX
@article{Horton2025,
  author  = {Horton, Matthew K. and Huck, Patrick and Yang, Ruo Xi and Munro, Jason M. and Dwaraknath, Shyam and Ganose, Alex M. and Kingsbury, Ryan S. and Wen, Mingjian and Shen, Jimmy X. and Mathis, Tyler S. and Kaplan, Aaron D. and Berket, Karlo and Riebesell, Janosh and George, Janine and Rosen, Andrew S. and Spotte-Smith, Evan W. C. and McDermott, Matthew J. and Cohen, Orion A. and Dunn, Alex and Kuner, Matthew C. and Rignanese, Gian-Marco and Petretto, Guido and Waroquiers, David and Griffin, Sinead M. and Neaton, Jeffrey B. and Chrzan, Daryl C. and Asta, Mark and Hautier, Geoffroy and Cholia, Shreyas and Ceder, Gerbrand and Ong, Shyue Ping and Jain, Anubhav and Persson, Kristin A.},
  title   = {Accelerated data-driven materials science with the Materials Project},
  journal = {Nature Materials},
  year    = {2025},
  volume  = {24},
  number  = {10},
  pages   = {1522--1532},
  month   = {oct},
  doi     = {10.1038/s41563-025-02272-0},
  issn    = {1476-4660},
  url     = {https://doi.org/10.1038/s41563-025-02272-0},
  abstract = {The Materials Project was launched formally in 2011 to drive materials discovery forwards through high-throughput computation and open data. More than a decade later, the Materials Project has become an indispensable tool used by more than 600,000 materials researchers around the world. This Perspective describes how the Materials Project, as a data platform and a software ecosystem, has helped to shape research in data-driven materials science. We cover how sustainable software and computational methods have accelerated materials design while becoming more open source and collaborative in nature. Next, we present cases where the Materials Project was used to understand and discover functional materials. We then describe our efforts to meet the needs of an expanding user base, through technical infrastructure updates ranging from data architecture and cloud resources to interactive web applications. Finally, we discuss opportunities to better aid the research community, with the vision that more accessible and easy-to-understand materials data will result in democratized materials knowledge and an increasingly collaborative community.}
}

3D Crystal Structure Rendering

Loading 3D structure…

Style: Ball & Stick
Raw CIF Data
# generated using pymatgen
data_Ho3(CoGe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.67477952
_cell_length_b   5.67477952
_cell_length_c   7.93185242
_cell_angle_alpha   73.64082355
_cell_angle_beta   73.64082355
_cell_angle_gamma   42.34737537
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ho3(CoGe2)2
_chemical_formula_sum   'Ho3 Co2 Ge4'
_cell_volume   164.02730777
_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  0.37612775  0.37612775  0.69216341  1.0
  Ho  Ho1  1  0.62387225  0.62387225  0.30783659  1.0
  Ho  Ho2  1  0.00000000  0.00000000  -0.00000000  1.0
  Co  Co3  1  0.30625036  0.30625036  0.37401421  1.0
  Co  Co4  1  0.69374964  0.69374964  0.62598579  1.0
  Ge  Ge5  1  0.09769396  0.09769396  0.60112387  1.0
  Ge  Ge6  1  0.90230604  0.90230604  0.39887613  1.0
  Ge  Ge7  1  0.70811211  0.70811211  0.91935243  1.0
  Ge  Ge8  1  0.29188789  0.29188789  0.08064757  1.0
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