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FeI2

Elasticity Data ELA

MP-ID: mp-571122 · Space group: P-3m1 (#164)

Basic Information

Formula
FeI2
MP-ID
mp-571122
Elements
2
Sites
3
Density
5.1730
g/cm³
Volume
99.40
ų
Cell a
4.0376
Å
Cell b
4.0376
Å
Cell c
7.0406
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
120.00
°
Space Group
P-3m1
Point Group
-3m
Crystal System
Trigonal
Bravais Lattice
Trigonal 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
12.57 7.0406 33.8 (0,0,0,1)
25.30 3.5203 23.1 (0,0,0,2)
25.47 3.4966 6.0 (1,0,-1,0)
25.47 3.4966 3.0 (1,-1,0,0)
28.50 3.1317 100.0 (1,0,-1,1)
28.50 3.1317 50.0 (1,-1,0,1)
36.21 2.4808 59.2 (1,0,-1,2)
44.90 2.0188 14.1 (1,1,-2,0)
44.90 2.0188 28.3 (2,-1,-1,0)
46.61 1.9486 40.7 (1,0,-1,3)
46.81 1.9406 2.3 (1,1,-2,1)
46.81 1.9406 4.6 (2,-1,-1,1)
51.95 1.7602 6.9 (0,0,0,4)
52.23 1.7513 6.3 (1,1,-2,2)
52.23 1.7513 12.6 (2,-1,-1,2)
54.05 1.6968 16.2 (2,0,-2,1)
54.05 1.6968 8.1 (2,-2,0,1)
58.73 1.5722 6.4 (1,0,-1,4)
58.99 1.5658 9.1 (2,0,-2,2)
58.99 1.5658 4.6 (2,-2,0,2)
66.39 1.4081 2.2 (0,0,0,5)
66.71 1.4020 9.1 (2,0,-2,3)
66.71 1.4020 4.5 (2,-2,0,3)
71.05 1.3267 5.3 (1,1,-2,4)
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Energy Properties

Formation Energy/atom
-0.35320
eV/atom
Energy/atom
-4.19255
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-21.4549
eV/atom
Volume/atom
33.13
ų
c/a Ratio
1.7438

Electronic Properties

Metallic
Non-metal
Band Gap
0.450
eV
Direct Gap
No
CBM
N/A
eV

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
4.0000
μB
Mag. Ordering
Unknown
Mag. Sites
0
Magnetization/Volume
0.040240
μB/ų

Elastic Properties

KVRH
10.949
GPa
GVRH
5.833
GPa
Young's Modulus E
14.860
GPa
Poisson Ratio ν
0.274
Pugh Ratio K/G
1.877
Vickers Hardness Est.
0.000
GPa
Ductility
Brittle
Anisotropy
6.547
Lame λ
7.060
GPa

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
I · 0.667
Element Family
Metalloid-Nonmetal
Solute Fraction
0.333
Interstitial Fraction
0.000

Elasticity Features

Elastic Modulus Comparison (GPa)
Elastic Features
Elastic Anisotropy AU
6.5470
Homogeneous Poisson ν
0.2740
Debye Temperature
193.9
K
Sound Velocity
1,182.2
m/s
Homogeneity
0.2740

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-571122
Reference Citation

The crystal structure and related material properties of FeI2 were obtained from the Materials Project database (MP-ID: mp-571122, 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_FeI2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.03756497
_cell_length_b   4.03756516
_cell_length_c   7.04060131
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   119.99998029
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeI2
_chemical_formula_sum   'Fe1 I2'
_cell_volume   99.39843298
_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
  Fe  Fe0  1  -0.00000000  0.00000000  0.00000000  1.0
  I  I1  1  0.33333300  0.66666700  0.22715850  1.0
  I  I2  1  0.66666700  0.33333300  0.77284150  1.0
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