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Gd2Fe2I

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-567844 · Space group: P6_3/mmc (#194)

Basic Information

Formula
Gd2Fe2I
MP-ID
mp-567844
Elements
3
Sites
10
Density
7.7282
g/cm³
Volume
237.68
ų
Cell a
3.9778
Å
Cell b
3.9778
Å
Cell c
17.3453
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
10.20 8.6727 8.3 (0,0,0,2)
25.86 3.4449 21.1 (1,0,-1,0)
26.38 3.3789 12.9 (1,0,-1,1)
27.87 3.2016 2.0 (0,1,-1,2)
27.87 3.2016 4.0 (1,0,-1,2)
30.20 2.9594 11.7 (1,0,-1,3)
30.93 2.8909 5.9 (0,0,0,6)
33.21 2.6973 100.0 (1,0,-1,4)
36.77 2.4444 4.0 (1,0,-1,5)
40.75 2.2145 14.6 (1,0,-1,6)
41.66 2.1682 9.7 (0,0,0,8)
45.07 2.0116 4.8 (1,0,-1,7)
45.61 1.9889 26.7 (1,1,-2,0)
45.61 1.9889 13.3 (2,-1,-1,0)
46.87 1.9386 1.0 (2,-1,-1,2)
52.78 1.7345 2.1 (0,0,0,10)
53.18 1.7224 1.0 (0,2,-2,0)
53.18 1.7224 2.1 (2,0,-2,0)
53.46 1.7140 1.8 (2,0,-2,1)
54.30 1.6895 1.0 (2,0,-2,2)
55.68 1.6508 1.3 (2,0,-2,3)
56.13 1.6386 6.9 (2,-1,-1,6)
57.58 1.6008 20.3 (2,0,-2,4)
59.68 1.5492 10.6 (1,0,-1,10)
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Energy Properties

Formation Energy/atom
-0.59866
eV/atom
Energy/atom
-9.92192
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-9.8461
eV/atom
Volume/atom
23.77
ų
c/a Ratio
4.3605

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
24.8406
μB
Mag. Ordering
FiM
Mag. Sites
8
Magnetization/Volume
0.104510
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Gd · 0.400
Element Family
Lanthanide
Solute Fraction
0.600
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0549
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.7706
J/mol·K
Ω Parameter
3.2793
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
16.425%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.5377
smaller = more stable mixing
VEC
5.400
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-3.840
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9602
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
C
Score
0.388
Family
Gd-rich Multi-Component
Matrix Element
Gd · 0.400

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-567844
Reference Citation

The crystal structure and related material properties of Gd2Fe2I were obtained from the Materials Project database (MP-ID: mp-567844, 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_Gd2Fe2I
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.97781035
_cell_length_b   3.97781053
_cell_length_c   17.34530094
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   119.99999839
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Gd2Fe2I
_chemical_formula_sum   'Gd4 Fe4 I2'
_cell_volume   237.68438164
_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
  Gd  Gd0  1  0.00000000  0.00000000  0.39422398  1.0
  Gd  Gd1  1  0.00000000  0.00000000  0.10577602  1.0
  Gd  Gd2  1  0.00000000  0.00000000  0.60577602  1.0
  Gd  Gd3  1  0.00000000  0.00000000  0.89422398  1.0
  Fe  Fe4  1  0.66666700  0.33333300  0.99442533  1.0
  Fe  Fe5  1  0.33333300  0.66666700  0.49442533  1.0
  Fe  Fe6  1  0.66666700  0.33333300  0.50557467  1.0
  Fe  Fe7  1  0.33333300  0.66666700  0.00557467  1.0
  I  I8  1  0.66666700  0.33333300  0.25000000  1.0
  I  I9  1  0.33333300  0.66666700  0.75000000  1.0
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