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HfMg6CO8

High-Entropy Materials HEA

MP-ID: mp-1033209 · Space group: P4/mmm (#123)

Basic Information

Formula
HfMg6CO8
MP-ID
mp-1033209
Elements
4
Sites
16
Density
4.5594
g/cm³
Volume
169.11
ų
Cell a
9.3599
Å
Cell b
4.2506
Å
Cell c
4.2506
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
90.00
°
Space Group
P4/mmm
Point Group
4/mmm
Crystal System
Tetragonal
Bravais Lattice
Tetragonal P
Stability
No
Packing Fraction
0.6800

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
9.45 9.3599 100.0 (1,0,0)
18.96 4.6800 22.2 (2,0,0)
20.90 4.2506 30.1 (0,1,0)
22.98 3.8702 78.3 (1,1,0)
28.36 3.1465 29.7 (2,1,0)
28.61 3.1200 16.5 (3,0,0)
29.72 3.0056 12.7 (0,1,1)
31.26 2.8617 44.2 (1,1,1)
35.50 2.5290 35.9 (2,1,1)
35.70 2.5152 17.3 (3,1,0)
38.47 2.3400 32.3 (4,0,0)
41.73 2.1646 5.2 (3,1,1)
42.54 2.1253 56.9 (0,2,0)
43.67 2.0725 11.3 (1,2,0)
44.18 2.0499 7.5 (4,1,0)
46.96 1.9351 8.4 (2,2,0)
47.85 1.9009 6.8 (0,2,1)
48.89 1.8629 21.6 (1,2,1)
49.36 1.8464 8.3 (4,1,1)
51.92 1.7612 11.1 (2,2,1)
52.07 1.7565 13.2 (3,2,0)
53.49 1.7132 10.7 (5,1,0)
56.71 1.6233 10.1 (3,2,1)
58.05 1.5890 15.2 (5,1,1)
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Energy Properties

Formation Energy/atom
-2.37353
eV/atom
Energy/atom
-6.65820
eV/atom
Energy above Hull
0.6589
eV/atom
Uncorrected Energy
-6.3147
eV/atom
Volume/atom
10.57
ų
c/a Ratio
0.4541

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
1.5531
μB
Mag. Ordering
FM
Mag. Sites
1
Magnetization/Volume
0.009180
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.500
Element Family
Metalloid-Nonmetal
Solute Fraction
0.500
Interstitial Fraction
0.063

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0610
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.8208
J/mol·K
Ω Parameter
1.1223
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
46.554%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
1.0299
smaller = more stable mixing
VEC
3.250
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-6.045
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7653
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (2)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1033209
Reference Citation

The crystal structure and related material properties of HfMg6CO8 were obtained from the Materials Project database (MP-ID: mp-1033209, 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_HfMg6CO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.35992426
_cell_length_b   4.25056847
_cell_length_c   4.25056847
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HfMg6CO8
_chemical_formula_sum   'Hf1 Mg6 C1 O8'
_cell_volume   169.10886208
_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
  Hf  Hf0  1  0.50000000  0.00000000  -0.00000000  1.0
  Mg  Mg1  1  0.00000000  0.50000000  0.50000000  1.0
  Mg  Mg2  1  0.50000000  0.50000000  0.50000000  1.0
  Mg  Mg3  1  0.21875600  -0.00000000  0.50000000  1.0
  Mg  Mg4  1  0.78124400  0.00000000  0.50000000  1.0
  Mg  Mg5  1  0.21875600  0.50000000  -0.00000000  1.0
  Mg  Mg6  1  0.78124400  0.50000000  0.00000000  1.0
  C  C7  1  0.00000000  0.00000000  -0.00000000  1.0
  O  O8  1  0.28193532  0.00000000  0.00000000  1.0
  O  O9  1  0.71806468  0.00000000  -0.00000000  1.0
  O  O10  1  0.24258830  0.50000000  0.50000000  1.0
  O  O11  1  0.75741170  0.50000000  0.50000000  1.0
  O  O12  1  0.00000000  0.00000000  0.50000000  1.0
  O  O13  1  0.50000000  0.00000000  0.50000000  1.0
  O  O14  1  0.00000000  0.50000000  -0.00000000  1.0
  O  O15  1  0.50000000  0.50000000  -0.00000000  1.0
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