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Hf9Mo4Ir

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-3295622 · Space group: P6_3/mmc (#194)

Basic Information

Formula
Hf9Mo4Ir
MP-ID
mp-3295622
Elements
3
Sites
28
Density
12.9867
g/cm³
Volume
558.10
ų
Cell a
8.7367
Å
Cell b
8.7367
Å
Cell c
8.4428
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
120.00
°
Space Group
P6_3/mmc
Point Group
6/mmm
Crystal System
Hexagonal
Bravais Lattice
Hexagonal P
Stability
Yes
Packing Fraction
0.7400

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 7.5662 2.1 (1,0,-1,0)
15.73 5.6346 6.2 (1,0,-1,1)
23.52 3.7831 2.1 (2,0,-2,0)
24.14 3.6865 6.4 (1,0,-1,2)
29.42 3.0356 5.5 (2,-1,-1,2)
31.28 2.8598 12.1 (3,-1,-2,0)
31.76 2.8173 27.0 (2,0,-2,2)
33.07 2.7086 19.9 (3,-1,-2,1)
33.99 2.6377 17.6 (1,0,-1,3)
35.60 2.5221 8.6 (3,0,-3,0)
35.60 2.5221 4.3 (3,-3,0,0)
37.21 2.4166 61.8 (3,0,-3,1)
38.01 2.3676 100.0 (3,-1,-2,2)
39.93 2.2580 54.2 (2,0,-2,3)
41.34 2.1842 30.7 (4,-2,-2,0)
42.85 2.1107 14.0 (0,0,0,4)
44.49 2.0365 5.4 (4,-1,-3,1)
45.20 2.0059 7.7 (3,-1,-2,3)
46.83 1.9399 1.9 (4,-2,-2,2)
47.86 1.9005 1.1 (2,-1,-1,4)
49.45 1.8432 1.9 (2,0,-2,4)
52.74 1.7358 5.7 (5,-2,-3,0)
52.74 1.7358 1.1 (3,-5,2,0)
54.55 1.6823 1.9 (4,-1,-3,3)
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Energy Properties

Formation Energy/atom
-0.25881
eV/atom
Energy/atom
-40.47381
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-40.4738
eV/atom
Volume/atom
19.93
ų
c/a Ratio
0.9664

Electronic Properties

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

Magnetic Properties

Magnetic
No
Total Mag. Moment
0.0542
μB
Mag. Ordering
NM
Mag. Sites
0
Magnetization/Volume
0.000100
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Hf · 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
0.7921
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
6.526%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.4160
smaller = more stable mixing
VEC
4.929
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-22.960
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7559
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
A
Score
0.629
Family
Hf-rich Multi-Component
Matrix Element
Hf · 0.643

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-3295622
Reference Citation

The crystal structure and related material properties of Hf9Mo4Ir were obtained from the Materials Project database (MP-ID: mp-3295622, 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_Hf9Mo4Ir
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.73667979
_cell_length_b   8.73667943
_cell_length_c   8.44282366
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   119.99999759
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Hf9Mo4Ir
_chemical_formula_sum   'Hf18 Mo8 Ir2'
_cell_volume   558.09891720
_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
  Hf  Hf0  1  0.19804385  0.80195615  0.44535138  1.0
  Hf  Hf1  1  0.19804385  0.39608671  0.44535138  1.0
  Hf  Hf2  1  0.60391329  0.80195615  0.44535138  1.0
  Hf  Hf3  1  0.80195615  0.19804385  0.55464862  1.0
  Hf  Hf4  1  0.80195615  0.60391329  0.55464862  1.0
  Hf  Hf5  1  0.39608671  0.19804385  0.55464862  1.0
  Hf  Hf6  1  0.80195615  0.19804385  0.94535138  1.0
  Hf  Hf7  1  0.80195615  0.60391329  0.94535138  1.0
  Hf  Hf8  1  0.39608671  0.19804385  0.94535138  1.0
  Hf  Hf9  1  0.19804385  0.80195615  0.05464862  1.0
  Hf  Hf10  1  0.19804385  0.39608671  0.05464862  1.0
  Hf  Hf11  1  0.60391329  0.80195615  0.05464862  1.0
  Hf  Hf12  1  0.54271340  0.45728660  0.25000000  1.0
  Hf  Hf13  1  0.54271340  0.08542680  0.25000000  1.0
  Hf  Hf14  1  0.91457320  0.45728660  0.25000000  1.0
  Hf  Hf15  1  0.45728660  0.54271340  0.75000000  1.0
  Hf  Hf16  1  0.45728660  0.91457320  0.75000000  1.0
  Hf  Hf17  1  0.08542680  0.54271340  0.75000000  1.0
  Mo  Mo18  1  0.88900754  0.11099246  0.25000000  1.0
  Mo  Mo19  1  0.88900754  0.77801407  0.25000000  1.0
  Mo  Mo20  1  0.22198593  0.11099246  0.25000000  1.0
  Mo  Mo21  1  0.11099246  0.88900754  0.75000000  1.0
  Mo  Mo22  1  0.11099246  0.22198593  0.75000000  1.0
  Mo  Mo23  1  0.77801407  0.88900754  0.75000000  1.0
  Mo  Mo24  1  0.00000000  0.00000000  0.50000000  1.0
  Mo  Mo25  1  0.00000000  0.00000000  0.00000000  1.0
  Ir  Ir26  1  0.33333300  0.66666700  0.25000000  1.0
  Ir  Ir27  1  0.66666700  0.33333300  0.75000000  1.0
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