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Pr7AlI12

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-3296137 · Space group: R-3 (#148)

Basic Information

Formula
Pr7AlI12
MP-ID
mp-3296137
Elements
3
Sites
20
Density
5.0743
g/cm³
Volume
829.96
ų
Cell a
10.0562
Å
Cell b
10.0562
Å
Cell c
10.0562
Å
α Angle
107.71
°
β Angle
107.71
°
γ Angle
107.71
°
Space Group
R-3
Point Group
-3
Crystal System
Trigonal
Bravais Lattice
Trigonal R
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
10.27 8.6154 2.0 (1,0,0)
10.27 8.6154 1.0 (0,1,0)
10.89 8.1208 16.4 (1,0,-1)
14.99 5.9094 10.5 (1,1,-1)
17.45 5.0815 2.2 (1,1,0)
18.57 4.7782 8.9 (2,0,-1)
18.93 4.6885 3.8 (2,-1,-1)
20.62 4.3077 2.5 (2,0,0)
21.89 4.0604 3.2 (2,0,-2)
23.38 3.8054 6.0 (2,1,-1)
24.23 3.6729 19.4 (2,1,-2)
24.50 3.6331 3.6 (1,1,1)
26.88 3.3163 15.1 (2,1,0)
28.13 3.1721 100.0 (3,-1,0)
28.13 3.1721 50.3 (3,0,-1)
28.86 3.0941 2.7 (3,-2,0)
28.86 3.0941 5.1 (3,0,-2)
29.09 3.0694 3.1 (3,-1,-2)
30.25 2.9547 3.5 (2,2,-2)
32.24 2.7766 5.2 (3,1,-2)
32.88 2.7239 5.1 (3,-2,-2)
32.88 2.7239 2.5 (2,2,-3)
33.50 2.6751 1.4 (1,1,2)
33.50 2.6751 2.7 (2,1,1)
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Energy Properties

Formation Energy/atom
-1.46084
eV/atom
Energy/atom
-26.82404
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-26.8240
eV/atom
Volume/atom
41.50
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
2.0005
μB
Mag. Ordering
FM
Mag. Sites
6
Magnetization/Volume
0.002410
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
I · 0.600
Element Family
Metalloid-Nonmetal
Solute Fraction
0.400
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.8237
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
6.8484
J/mol·K
Ω Parameter
0.0000
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
13.703%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.7271
smaller = more stable mixing
VEC
4.200
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.000
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7498
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.546
Family
I-rich Multi-Component
Matrix Element
I · 0.600

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-3296137
Reference Citation

The crystal structure and related material properties of Pr7AlI12 were obtained from the Materials Project database (MP-ID: mp-3296137, 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_Pr7AlI12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.05624068
_cell_length_b   10.05624049
_cell_length_c   10.05624128
_cell_angle_alpha   107.71122212
_cell_angle_beta   107.71121908
_cell_angle_gamma   107.71122561
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Pr7AlI12
_chemical_formula_sum   'Pr7 Al1 I12'
_cell_volume   829.96023113
_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
  Pr  Pr0  1  0.96415908  0.89180192  0.67984180  1.0
  Pr  Pr1  1  0.03584092  0.10819808  0.32015820  1.0
  Pr  Pr2  1  0.10819808  0.32015820  0.03584092  1.0
  Pr  Pr3  1  0.32015820  0.03584092  0.10819808  1.0
  Pr  Pr4  1  0.50000000  0.50000000  0.50000000  1.0
  Pr  Pr5  1  0.89180192  0.67984180  0.96415908  1.0
  Pr  Pr6  1  0.67984180  0.96415908  0.89180192  1.0
  Al  Al7  1  0.00000000  0.00000000  0.00000000  1.0
  I  I8  1  0.52495104  0.60612164  0.84314385  1.0
  I  I9  1  0.47504896  0.39387836  0.15685615  1.0
  I  I10  1  0.31187258  0.92118642  0.76902430  1.0
  I  I11  1  0.39387836  0.15685615  0.47504896  1.0
  I  I12  1  0.92118642  0.76902430  0.31187258  1.0
  I  I13  1  0.68812742  0.07881358  0.23097570  1.0
  I  I14  1  0.07881358  0.23097570  0.68812742  1.0
  I  I15  1  0.76902430  0.31187258  0.92118642  1.0
  I  I16  1  0.23097570  0.68812742  0.07881358  1.0
  I  I17  1  0.84314385  0.52495104  0.60612164  1.0
  I  I18  1  0.15685615  0.47504896  0.39387836  1.0
  I  I19  1  0.60612164  0.84314385  0.52495104  1.0
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