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Ca2AlPt2

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-1078362 · Space group: C2/c (#15)

Basic Information

Formula
Ca2AlPt2
MP-ID
mp-1078362
Elements
3
Sites
10
Density
7.7213
g/cm³
Volume
213.90
ų
Cell a
5.7093
Å
Cell b
5.7093
Å
Cell c
7.7098
Å
α Angle
79.88
°
β Angle
79.88
°
γ Angle
60.38
°
Space Group
C2/c
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
17.97 4.9362 88.9 (1,0,0)
20.45 4.3430 85.2 (1,0,1)
22.52 3.9479 56.2 (1,0,-1)
23.57 3.7745 96.8 (0,0,2)
26.86 3.3198 2.0 (1,1,2)
28.23 3.1609 18.6 (1,0,2)
31.29 2.8586 35.4 (1,0,-2)
31.85 2.8094 12.0 (2,1,0)
31.96 2.8002 10.4 (2,1,1)
32.95 2.7186 7.2 (1,1,-2)
33.39 2.6834 8.0 (1,-1,1)
36.03 2.4925 32.9 (2,1,-1)
36.32 2.4734 34.6 (2,1,2)
37.13 2.4213 100.0 (2,0,1)
37.22 2.4160 49.7 (2,2,0)
38.43 2.3424 37.3 (1,0,3)
39.58 2.2771 88.3 (2,0,-1)
40.01 2.2534 43.5 (2,2,2)
41.96 2.1532 22.7 (1,0,-3)
43.43 2.0837 17.9 (2,1,-2)
43.84 2.0651 16.3 (2,1,3)
48.22 1.8872 15.8 (0,0,4)
48.49 1.8774 9.6 (2,-1,0)
48.70 1.8696 15.3 (2,2,-2)
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Energy Properties

Formation Energy/atom
-1.09206
eV/atom
Energy/atom
-25.84889
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-25.8489
eV/atom
Volume/atom
21.39
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
0.0000
μB
Mag. Ordering
Unknown
Mag. Sites
0
Magnetization/Volume
0.000000
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Ca · 0.400
Element Family
Alkali-AlkEarth
Solute Fraction
0.600
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0549
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.7706
J/mol·K
Ω Parameter
0.2219
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
17.055%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.5726
smaller = more stable mixing
VEC
5.400
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-57.276
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9602
SS Former
0
Phase Tendency
AM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.468
Family
Ca-rich Multi-Component
Matrix Element
Ca · 0.400

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1078362
Reference Citation

The crystal structure and related material properties of Ca2AlPt2 were obtained from the Materials Project database (MP-ID: mp-1078362, 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_Ca2AlPt2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.70929831
_cell_length_b   5.70929831
_cell_length_c   7.70981649
_cell_angle_alpha   79.88271640
_cell_angle_beta   79.88271640
_cell_angle_gamma   60.37587835
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca2AlPt2
_chemical_formula_sum   'Ca4 Al2 Pt4'
_cell_volume   213.90154775
_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
  Ca  Ca0  1  0.78213723  0.51730613  0.85150309  1.0
  Ca  Ca1  1  0.48269387  0.21786277  0.64849691  1.0
  Ca  Ca2  1  0.21786277  0.48269387  0.14849691  1.0
  Ca  Ca3  1  0.51730613  0.78213723  0.35150309  1.0
  Al  Al4  1  0.10978244  0.89021756  0.75000000  1.0
  Al  Al5  1  0.89021756  0.10978244  0.25000000  1.0
  Pt  Pt6  1  0.00446650  0.73661281  0.50366427  1.0
  Pt  Pt7  1  0.26338719  0.99553350  0.99633573  1.0
  Pt  Pt8  1  0.99553350  0.26338719  0.49633573  1.0
  Pt  Pt9  1  0.73661281  0.00446650  0.00366427  1.0
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