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ErPa(Co3Si2)2

High-Entropy Materials HEA

MP-ID: mp-3247062 · Space group: Imm2 (#44)

Basic Information

Formula
ErPa(Co3Si2)2
MP-ID
mp-3247062
Elements
4
Sites
12
Density
9.0660
g/cm³
Volume
158.30
ų
Cell a
6.1889
Å
Cell b
6.1889
Å
Cell c
6.1889
Å
α Angle
130.21
°
β Angle
113.33
°
γ Angle
87.61
°
Space Group
Imm2
Point Group
mm2
Crystal System
Orthorhombic
Bravais Lattice
Orthorhombic I
Stability
Yes
Packing Fraction
0.6800

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
16.38 5.4117 5.7 (0,1,-1)
19.73 4.5007 32.5 (0,1,0)
19.88 4.4664 17.7 (1,1,-1)
21.48 4.1363 12.0 (0,0,1)
26.20 3.4010 5.3 (1,-1,1)
29.43 3.0348 6.1 (1,1,0)
32.83 2.7277 1.3 (1,2,-2)
33.01 2.7134 100.0 (1,0,1)
33.11 2.7059 49.1 (0,2,-2)
34.43 2.6052 10.5 (1,-1,-1)
34.70 2.5852 14.2 (1,2,-1)
34.70 2.5852 14.2 (2,1,-2)
38.35 2.3474 5.2 (0,1,1)
38.35 2.3474 15.5 (1,0,-2)
40.07 2.2504 32.5 (0,2,0)
40.07 2.2504 32.5 (2,0,-2)
40.39 2.2332 36.9 (2,2,-2)
43.53 2.0790 1.6 (1,-1,2)
43.77 2.0682 16.4 (0,0,2)
43.77 2.0682 16.4 (2,-2,0)
44.00 2.0581 62.6 (2,1,0)
44.00 2.0581 20.9 (3,0,-1)
46.20 1.9651 6.0 (3,1,-2)
48.29 1.8848 10.9 (0,2,-3)
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Energy Properties

Formation Energy/atom
-0.60666
eV/atom
Energy/atom
-19.38016
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-19.3802
eV/atom
Volume/atom
13.19
ų
c/a Ratio
-

Electronic Properties

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

Magnetic Properties

Magnetic
No
Total Mag. Moment
0.0002
μB
Mag. Ordering
NM
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
Co · 0.500
Element Family
3d-TM
Solute Fraction
0.500
Interstitial Fraction
0.333

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.1269
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
9.3693
J/mol·K
Ω Parameter
0.7027
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
16.088%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.2004
smaller = more stable mixing
VEC
7.455
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-23.333
kJ/mol; negative = exothermic mixing
Entropy Norm
0.8129
SS Former
0
Phase Tendency
AM

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-3247062
Reference Citation

The crystal structure and related material properties of ErPa(Co3Si2)2 were obtained from the Materials Project database (MP-ID: mp-3247062, 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_ErPa(Co3Si2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.18893599
_cell_length_b   6.18893667
_cell_length_c   6.18893667
_cell_angle_alpha   130.21202632
_cell_angle_beta   113.33004521
_cell_angle_gamma   87.61321859
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ErPa(Co3Si2)2
_chemical_formula_sum   'Er1 Pa1 Co6 Si4'
_cell_volume   158.29512212
_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
  Er  Er0  1  0.75000000  0.45648558  0.70648558  1.0
  Pa  Pa1  1  0.25000000  0.54495203  0.29495203  1.0
  Co  Co2  1  0.01761846  0.00093654  0.51855499  1.0
  Co  Co3  1  0.48238154  0.00093654  0.98331808  1.0
  Co  Co4  1  0.71526551  0.99275770  0.71367980  1.0
  Co  Co5  1  0.22092211  0.49841430  0.71367980  1.0
  Co  Co6  1  0.27907789  0.99275770  0.27749219  1.0
  Co  Co7  1  0.78473449  0.49841430  0.27749219  1.0
  Si  Si8  1  0.07065098  0.87525954  0.80460856  1.0
  Si  Si9  1  0.90507129  0.10763589  0.20256360  1.0
  Si  Si10  1  0.59492871  0.79749331  0.20256360  1.0
  Si  Si11  1  0.42934902  0.23395558  0.80460856  1.0
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