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Sm(MnAl2)4

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-972569 · Space group: I4/mmm (#139)

Basic Information

Formula
Sm(MnAl2)4
MP-ID
mp-972569
Elements
3
Sites
13
Density
5.0367
g/cm³
Volume
193.18
ų
Cell a
6.7187
Å
Cell b
6.7187
Å
Cell c
6.7187
Å
α Angle
97.81
°
β Angle
97.81
°
γ Angle
136.75
°
Space Group
I4/mmm
Point Group
4/mmm
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
14.18 6.2459 50.1 (1,-1,0)
20.11 4.4165 3.8 (1,-1,1)
20.56 4.3196 43.9 (1,0,-1)
28.58 3.1229 45.2 (2,-2,0)
28.91 3.0881 62.8 (2,-1,0)
32.04 2.7932 29.8 (2,-2,1)
35.47 2.5308 51.2 (2,-1,-2)
36.28 2.4761 4.5 (1,1,-1)
39.14 2.3018 8.9 (1,1,-2)
40.87 2.2082 74.5 (2,-2,2)
41.11 2.1958 85.5 (1,0,-3)
41.83 2.1598 100.0 (2,0,-2)
43.47 2.0820 10.6 (3,-3,0)
45.95 1.9751 8.7 (3,-3,1)
46.17 1.9662 1.1 (3,-2,-2)
46.82 1.9402 19.1 (3,-1,-1)
49.17 1.8529 18.0 (2,0,-3)
52.85 1.7323 7.9 (3,-3,2)
55.20 1.6639 15.3 (3,-2,-3)
56.73 1.6226 3.0 (2,1,-2)
57.87 1.5935 9.1 (1,1,-4)
59.17 1.5615 14.4 (4,-4,0)
59.35 1.5571 6.6 (4,-3,-2)
59.91 1.5440 35.7 (4,-2,0)
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Energy Properties

Formation Energy/atom
-0.30846
eV/atom
Energy/atom
-5.79548
eV/atom
Energy above Hull
0.0213
eV/atom
Uncorrected Energy
-5.7955
eV/atom
Volume/atom
14.86
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
5.1090
μB
Mag. Ordering
FiM
Mag. Sites
5
Magnetization/Volume
0.026450
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Al · 0.615
Element Family
PostTransition-Noble
Solute Fraction
0.385
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.8587
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
7.1396
J/mol·K
Ω Parameter
0.5682
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
10.294%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.1152
smaller = more stable mixing
VEC
4.462
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-14.391
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7817
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
A
Score
0.745
Family
Al-based Alloy
Matrix Element
Al · 0.615

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-972569
Reference Citation

The crystal structure and related material properties of Sm(MnAl2)4 were obtained from the Materials Project database (MP-ID: mp-972569, 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_Sm(MnAl2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.71874099
_cell_length_b   6.71874099
_cell_length_c   6.71874099
_cell_angle_alpha   97.80565839
_cell_angle_beta   97.80565839
_cell_angle_gamma   136.75018388
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sm(MnAl2)4
_chemical_formula_sum   'Sm1 Mn4 Al8'
_cell_volume   193.18462050
_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
  Sm  Sm0  1  0.00000000  0.00000000  0.00000000  1.0
  Mn  Mn1  1  0.50000000  0.50000000  0.50000000  1.0
  Mn  Mn2  1  0.00000000  0.00000000  0.50000000  1.0
  Mn  Mn3  1  0.00000000  0.50000000  0.00000000  1.0
  Mn  Mn4  1  0.50000000  0.00000000  0.00000000  1.0
  Al  Al5  1  0.27982500  0.50000000  0.77982500  1.0
  Al  Al6  1  0.72017500  0.50000000  0.22017500  1.0
  Al  Al7  1  0.50000000  0.72017500  0.22017500  1.0
  Al  Al8  1  0.50000000  0.27982500  0.77982500  1.0
  Al  Al9  1  0.65723100  0.00000000  0.65723100  1.0
  Al  Al10  1  0.34276900  0.00000000  0.34276900  1.0
  Al  Al11  1  0.00000000  0.34276900  0.34276900  1.0
  Al  Al12  1  0.00000000  0.65723100  0.65723100  1.0
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