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Sr(CoAs)2

High-Entropy Materials HEA Traditional Materials TRA Elasticity Data ELA

MP-ID: mp-571203 · Space group: I4/mmm (#139)

Basic Information

Formula
Sr(CoAs)2
MP-ID
mp-571203
Elements
3
Sites
5
Density
6.5022
g/cm³
Volume
90.75
ų
Cell a
3.9815
Å
Cell b
3.9815
Å
Cell c
6.3792
Å
α Angle
108.18
°
β Angle
108.18
°
γ Angle
90.00
°
Space Group
I4/mmm
Point Group
4/mmm
Crystal System
Tetragonal
Bravais Lattice
Tetragonal I
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
15.48 5.7244 26.4 (0,0,1)
31.25 2.8622 4.9 (0,0,2)
31.78 2.8154 18.0 (1,1,-1)
32.50 2.7551 100.0 (1,0,-2)
32.50 2.7551 33.3 (1,0,1)
35.53 2.5263 26.7 (1,1,-2)
35.53 2.5263 26.7 (1,-1,1)
45.18 2.0071 6.4 (1,1,-3)
45.18 2.0071 12.7 (1,-1,2)
45.18 2.0071 6.4 (1,1,1)
45.57 1.9908 31.3 (0,2,-1)
45.57 1.9908 31.3 (2,0,-1)
45.71 1.9849 6.2 (1,0,-3)
45.71 1.9849 2.1 (1,0,2)
47.66 1.9081 1.5 (0,0,3)
48.41 1.8803 1.2 (0,2,-2)
48.41 1.8803 2.5 (0,2,0)
48.41 1.8803 1.2 (2,0,0)
56.29 1.6343 2.4 (2,0,-3)
57.08 1.6136 6.5 (1,2,-3)
57.08 1.6136 32.5 (1,-2,-1)
57.08 1.6136 13.0 (2,-1,1)
58.43 1.5795 23.8 (1,1,-4)
58.43 1.5795 23.8 (1,-1,3)
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Energy Properties

Formation Energy/atom
-0.61883
eV/atom
Energy/atom
-14.82467
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-14.8247
eV/atom
Volume/atom
18.15
ų
c/a Ratio
1.6022

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
1.3759
μB
Mag. Ordering
Unknown
Mag. Sites
0
Magnetization/Volume
0.015160
μB/ų

Elastic Properties

KVRH
79.041
GPa
GVRH
33.717
GPa
Young's Modulus E
88.559
GPa
Poisson Ratio ν
0.313
Pugh Ratio K/G
2.344
Vickers Hardness Est.
2.780
GPa
Ductility
Brittle
Anisotropy
1.850
Lame λ
56.563
GPa

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Co · 0.400
Element Family
3d-TM
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
0.0000
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
23.758%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.4524
smaller = more stable mixing
VEC
5.200
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.000
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9602
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.553
Family
Co-rich Multi-Component
Matrix Element
Co · 0.400

Elasticity Features

Elastic Modulus Comparison (GPa)
Elastic Features
Elastic Anisotropy AU
1.8500
Homogeneous Poisson ν
0.3130
Debye Temperature
416.9
K
Sound Velocity
2,547.9
m/s
Homogeneity
0.3130

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-571203
Reference Citation

The crystal structure and related material properties of Sr(CoAs)2 were obtained from the Materials Project database (MP-ID: mp-571203, 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_Sr(CoAs)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.98151416
_cell_length_b   3.98151503
_cell_length_c   6.37922966
_cell_angle_alpha   108.18394518
_cell_angle_beta   108.18395132
_cell_angle_gamma   89.99999876
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr(CoAs)2
_chemical_formula_sum   'Sr1 Co2 As2'
_cell_volume   90.74522962
_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
  Sr  Sr0  1  -0.00000000  -0.00000000  -0.00000000  1.0
  Co  Co1  1  0.25000000  0.75000000  0.50000000  1.0
  Co  Co2  1  0.75000000  0.25000000  0.50000000  1.0
  As  As3  1  0.35135421  0.35135421  0.70270942  1.0
  As  As4  1  0.64864579  0.64864579  0.29729058  1.0
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