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Er2Al3Co

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-567849 · Space group: P6_3/mmc (#194)

Basic Information

Formula
Er2Al3Co
MP-ID
mp-567849
Elements
3
Sites
12
Density
7.2120
g/cm³
Volume
218.45
ų
Cell a
5.4284
Å
Cell b
5.4284
Å
Cell c
8.5603
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
120.00
°
Space Group
P6_3/mmc
Point Group
6/mmm
Crystal System
Hexagonal
Bravais Lattice
Hexagonal P
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
18.88 4.7011 21.2 (1,0,-1,0)
18.88 4.7011 10.6 (1,-1,0,0)
20.75 4.2801 59.3 (0,0,0,2)
21.57 4.1206 13.7 (0,1,-1,1)
21.57 4.1206 13.7 (1,0,-1,1)
21.57 4.1206 13.7 (1,-1,0,1)
28.20 3.1649 9.6 (1,0,-1,2)
28.20 3.1649 3.2 (1,0,-1,-2)
28.20 3.1649 6.4 (1,-1,0,2)
33.00 2.7142 50.0 (1,1,-2,0)
33.00 2.7142 100.0 (2,-1,-1,0)
36.85 2.4393 85.6 (1,0,-1,3)
36.85 2.4393 42.8 (1,-1,0,3)
38.29 2.3506 5.1 (0,2,-2,0)
38.29 2.3506 5.1 (2,0,-2,0)
38.29 2.3506 5.1 (2,-2,0,0)
39.31 2.2922 51.8 (1,1,-2,2)
39.31 2.2922 77.7 (2,-1,-1,2)
39.31 2.2922 25.9 (2,-1,-1,-2)
39.77 2.2667 26.8 (2,0,-2,1)
39.77 2.2667 13.4 (2,-2,0,1)
42.23 2.1401 5.8 (0,0,0,4)
46.63 1.9478 2.0 (1,0,-1,4)
50.29 1.8143 12.0 (2,0,-2,3)
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Energy Properties

Formation Energy/atom
-0.48861
eV/atom
Energy/atom
-5.07288
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-17.3906
eV/atom
Volume/atom
18.20
ų
c/a Ratio
1.5769

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
1.3457
μB
Mag. Ordering
Unknown
Mag. Sites
0
Magnetization/Volume
0.006160
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Al · 0.500
Element Family
PostTransition-Noble
Solute Fraction
0.500
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0114
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.4088
J/mol·K
Ω Parameter
1.8084
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
12.176%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.2273
smaller = more stable mixing
VEC
7.000
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-6.333
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9206
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
A
Score
0.630
Family
Al-based Alloy
Matrix Element
Al · 0.500

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-567849
Reference Citation

The crystal structure and related material properties of Er2Al3Co were obtained from the Materials Project database (MP-ID: mp-567849, 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_Er2Al3Co
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.42839484
_cell_length_b   5.42839528
_cell_length_c   8.56027582
_cell_angle_alpha   90.00000352
_cell_angle_beta   89.99999307
_cell_angle_gamma   119.99990591
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Er2Al3Co
_chemical_formula_sum   'Er4 Al6 Co2'
_cell_volume   218.45485186
_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
  Er  Er0  1  0.33333400  0.66666900  0.44149576  1.0
  Er  Er1  1  0.66666800  0.33333400  0.94154762  1.0
  Er  Er2  1  0.66666600  0.33333100  0.55850424  1.0
  Er  Er3  1  0.33333200  0.66666600  0.05845238  1.0
  Al  Al4  1  0.32628788  0.16314394  0.24992148  1.0
  Al  Al5  1  0.16314394  0.83685606  0.75007852  1.0
  Al  Al6  1  0.16314394  0.32628788  0.75007852  1.0
  Al  Al7  1  0.83685606  0.67371212  0.24992148  1.0
  Al  Al8  1  0.67371212  0.83685606  0.75007852  1.0
  Al  Al9  1  0.83685606  0.16314394  0.24992148  1.0
  Co  Co10  1  0.00000000  0.00000000  -0.00000000  1.0
  Co  Co11  1  0.00000000  0.00000000  0.50000000  1.0
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