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Np2Al9Ir2Pt

High-Entropy Materials HEA

MP-ID: mp-3291345 · Space group: C2/m (#12)

Basic Information

Formula
Np2Al9Ir2Pt
MP-ID
mp-3291345
Elements
4
Sites
28
Density
9.1238
g/cm³
Volume
471.87
ų
Cell a
7.5670
Å
Cell b
7.5670
Å
Cell c
9.4661
Å
α Angle
89.98
°
β Angle
89.98
°
γ Angle
119.47
°
Space Group
C2/m
Point Group
2/m
Crystal System
Monoclinic
Bravais Lattice
Monoclinic C
Stability
Yes
Packing Fraction
0.5240

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
13.44 6.5877 10.5 (1,0,-1,0)
13.44 6.5877 10.5 (0,1,-1,0)
13.55 6.5358 31.8 (1,-1,0,0)
16.39 5.4086 17.3 (0,1,-1,1)
16.39 5.4086 17.3 (1,0,-1,1)
16.40 5.4057 18.5 (1,0,-1,-1)
16.40 5.4057 18.5 (0,1,-1,-1)
18.75 4.7330 9.5 (0,0,0,2)
23.13 3.8448 2.9 (0,1,-1,2)
23.13 3.8448 2.9 (1,0,-1,2)
23.15 3.8428 2.2 (1,0,-1,-2)
23.15 3.8428 2.2 (0,1,-1,-2)
23.20 3.8334 7.0 (1,-1,0,-2)
23.20 3.8334 7.0 (1,-1,0,2)
23.33 3.8135 23.7 (1,1,-2,0)
23.51 3.7834 25.2 (2,-1,-1,0)
23.51 3.7833 25.2 (1,-2,1,0)
25.17 3.5381 29.7 (1,1,-2,1)
25.18 3.5365 27.3 (1,1,-2,-1)
25.35 3.5135 28.5 (1,-2,1,-1)
25.35 3.5135 28.5 (2,-1,-1,1)
25.35 3.5128 30.9 (2,-1,-1,-1)
25.36 3.5127 30.9 (1,-2,1,1)
27.07 3.2938 1.9 (2,0,-2,0)
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Energy Properties

Formation Energy/atom
-0.89328
eV/atom
Energy/atom
-28.23926
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-28.2393
eV/atom
Volume/atom
16.85
ų
c/a Ratio
-

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
15.8183
μB
Mag. Ordering
FM
Mag. Sites
4
Magnetization/Volume
0.033520
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Al · 0.643
Element Family
PostTransition-Noble
Solute Fraction
0.357
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0285
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.5511
J/mol·K
Ω Parameter
0.7213
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
8.193%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.2853
smaller = more stable mixing
VEC
4.583
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-15.022
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7419
SS Former
0
Phase Tendency
AM

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-3291345
Reference Citation

The crystal structure and related material properties of Np2Al9Ir2Pt were obtained from the Materials Project database (MP-ID: mp-3291345, 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_Np2Al9Ir2Pt
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.56702534
_cell_length_b   7.56700460
_cell_length_c   9.46608274
_cell_angle_alpha   89.98082714
_cell_angle_beta   89.98151602
_cell_angle_gamma   119.47440856
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Np2Al9Ir2Pt
_chemical_formula_sum   'Np4 Al18 Ir4 Pt2'
_cell_volume   471.87379210
_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
  Np  Np0  1  0.99376221  0.66955937  0.25311908  1.0
  Np  Np1  1  0.00623779  0.33044063  0.74688092  1.0
  Np  Np2  1  0.66956180  0.99376073  0.25313044  1.0
  Np  Np3  1  0.33043820  0.00623927  0.74686956  1.0
  Al  Al4  1  0.13011059  0.13012066  0.24976383  1.0
  Al  Al5  1  0.86988941  0.86987934  0.75023617  1.0
  Al  Al6  1  0.00095896  0.33244742  0.07383028  1.0
  Al  Al7  1  0.99904104  0.66755258  0.92616972  1.0
  Al  Al8  1  0.99780846  0.66459864  0.57387380  1.0
  Al  Al9  1  0.33539329  0.00217883  0.42610917  1.0
  Al  Al10  1  0.00219154  0.33540136  0.42612620  1.0
  Al  Al11  1  0.66460671  0.99782117  0.57389083  1.0
  Al  Al12  1  0.66756288  0.99905041  0.92616099  1.0
  Al  Al13  1  0.33243712  0.00094959  0.07383901  1.0
  Al  Al14  1  0.33439194  0.33438889  0.54709095  1.0
  Al  Al15  1  0.66560806  0.66561111  0.45290905  1.0
  Al  Al16  1  0.66877410  0.66878382  0.05584794  1.0
  Al  Al17  1  0.33122590  0.33121618  0.94415206  1.0
  Al  Al18  1  0.34074978  0.54644644  0.25231541  1.0
  Al  Al19  1  0.65925022  0.45355356  0.74768459  1.0
  Al  Al20  1  0.54643543  0.34076473  0.25231337  1.0
  Al  Al21  1  0.45356457  0.65923527  0.74768663  1.0
  Ir  Ir22  1  0.32823117  0.67176971  0.50000845  1.0
  Ir  Ir23  1  0.67176883  0.32823029  0.49999155  1.0
  Ir  Ir24  1  0.00000000  0.00000000  0.00000000  1.0
  Ir  Ir25  1  0.00000000  0.00000000  0.50000000  1.0
  Pt  Pt26  1  0.67067304  0.32933703  0.99999822  1.0
  Pt  Pt27  1  0.32932696  0.67066297  0.00000178  1.0
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