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Ba4Fe2S4I5

High-Entropy Materials HEA

MP-ID: mp-555458 · Space group: I4/m (#87)

Basic Information

Formula
Ba4Fe2S4I5
MP-ID
mp-555458
Elements
4
Sites
15
Density
4.6655
g/cm³
Volume
506.75
ų
Cell a
10.2310
Å
Cell b
10.2310
Å
Cell c
10.2310
Å
α Angle
93.66
°
β Angle
93.66
°
γ Angle
150.72
°
Space Group
I4/m
Point Group
4/m
Crystal System
Tetragonal
Bravais Lattice
Tetragonal I
Stability
No
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
17.92 4.9494 1.6 (0,0,2)
18.29 4.8512 6.7 (1,0,0)
20.06 4.4269 11.6 (1,-1,2)
22.30 3.9872 36.3 (1,0,1)
25.45 3.4998 7.8 (2,-2,2)
25.71 3.4645 74.2 (2,-1,1)
27.02 3.2996 8.4 (0,0,3)
28.51 3.1303 61.5 (1,-1,3)
28.75 3.1050 100.0 (1,0,2)
31.52 2.8383 64.9 (2,-1,2)
32.62 2.7454 22.2 (2,-2,3)
34.69 2.5858 31.3 (1,1,-1)
35.89 2.5019 5.2 (1,1,0)
36.49 2.4622 8.7 (1,0,3)
37.06 2.4256 4.5 (2,0,0)
37.46 2.4008 25.3 (1,-1,4)
38.59 2.3332 1.5 (3,-3,3)
38.77 2.3226 13.0 (2,-1,3)
39.31 2.2919 6.9 (1,1,1)
40.40 2.2328 1.4 (2,0,1)
40.77 2.2134 8.3 (2,-2,4)
43.02 2.1026 6.7 (3,-2,3)
44.52 2.0353 13.3 (1,1,2)
45.02 2.0137 9.7 (1,0,4)
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Energy Properties

Formation Energy/atom
-1.70533
eV/atom
Energy/atom
-4.95771
eV/atom
Energy above Hull
0.0222
eV/atom
Uncorrected Energy
-4.6972
eV/atom
Volume/atom
33.78
ų
c/a Ratio
1.0000

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
7.0019
μB
Mag. Ordering
FM
Mag. Sites
2
Magnetization/Volume
0.013820
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

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

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.3398
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
11.1390
J/mol·K
Ω Parameter
1.9336
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
28.796%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.7511
smaller = more stable mixing
VEC
4.867
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-4.267
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9665
SS Former
0
Phase Tendency
IM

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-555458
Reference Citation

The crystal structure and related material properties of Ba4Fe2S4I5 were obtained from the Materials Project database (MP-ID: mp-555458, 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_Ba4Fe2S4I5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.23098430
_cell_length_b   10.23098430
_cell_length_c   10.23098430
_cell_angle_alpha   93.66257539
_cell_angle_beta   93.66257539
_cell_angle_gamma   150.71988369
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ba4Fe2S4I5
_chemical_formula_sum   'Ba4 Fe2 S4 I5'
_cell_volume   506.75450464
_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
  Ba  Ba0  1  0.93937900  0.25039100  0.18977000  1.0
  Ba  Ba1  1  0.74960900  0.93937900  0.68898700  1.0
  Ba  Ba2  1  0.25039100  0.06062100  0.31101300  1.0
  Ba  Ba3  1  0.06062100  0.74960900  0.81023000  1.0
  Fe  Fe4  1  0.25000000  0.75000000  0.50000000  1.0
  Fe  Fe5  1  0.75000000  0.25000000  0.50000000  1.0
  S  S6  1  0.10035800  0.41453700  0.51489500  1.0
  S  S7  1  0.58546300  0.10035800  0.68582100  1.0
  S  S8  1  0.89964200  0.58546300  0.48510500  1.0
  S  S9  1  0.41453700  0.89964200  0.31417900  1.0
  I  I10  1  0.70330300  0.36931000  0.07261300  1.0
  I  I11  1  0.63069000  0.70330300  0.33399300  1.0
  I  I12  1  0.29669700  0.63069000  0.92738700  1.0
  I  I13  1  0.00000000  0.00000000  0.00000000  1.0
  I  I14  1  0.36931000  0.29669700  0.66600700  1.0
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