Er(Al10Cr)2

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-680636 · Space group: Fd-3m (#227)

Materials Project API

Basic Information

Formula

Er(Al10Cr)2

MP-ID

mp-680636

Elements

Sites

Density

3.5600

g/cm³

Volume

756.47

Å³

Cell a

10.2275

Cell b

10.2275

Cell c

10.2275

α Angle

60.00

β Angle

60.00

γ Angle

60.00

Space Group

Fd-3m

Point Group

m-3m

Crystal System

Cubic

Bravais Lattice

Cubic F

Stability

Packing Fraction

0.7400

X-ray Diffraction

Diffraction Pattern

Target / Radiation

X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å

Diffraction Peaks (Top 24)

2θ	d (Å)	I	hkl
10.59	8.3507	8.0	(1,1,1)
17.34	5.1138	64.9	(2,1,1)
20.36	4.3610	100.0	(2,2,1)
21.28	4.1754	5.6	(2,2,2)
24.62	3.6160	4.3	(2,2,0)
26.87	3.3182	11.4	(3,2,2)
30.27	2.9524	29.7	(3,3,2)
32.16	2.7836	22.8	(3,3,3)
35.10	2.5569	50.4	(4,2,2)
36.76	2.4448	97.4	(4,3,2)
37.30	2.4106	8.9	(4,3,3)
39.40	2.2869	71.0	(4,3,1)
40.91	2.2057	91.6	(4,4,3)
41.41	2.1805	62.6	(4,4,2)
43.34	2.0877	5.2	(4,4,4)
44.75	2.0254	3.3	(5,3,3)
47.01	1.9328	13.1	(5,4,3)
48.33	1.8830	23.7	(5,3,1)
50.48	1.8080	3.7	(4,4,0)
51.73	1.7670	13.2	(5,5,3)
53.78	1.7046	44.3	(6,3,3)
54.98	1.6701	13.6	(6,4,3)
58.10	1.5876	2.4	(6,5,4)
58.48	1.5781	1.2	(6,5,3)

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Energy Properties

Formation Energy/atom

-0.13710

eV/atom

Energy/atom

-4.43212

eV/atom

Energy above Hull

0.0148

eV/atom

Uncorrected Energy

-4.4321

eV/atom

Volume/atom

16.45

Å³

c/a Ratio

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

4.6445

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.006140

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Al · 0.870

Element Family

PostTransition-Noble

Solute Fraction

0.130

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.4702

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

3.9095

J/mol·K

Ω Parameter

1.3956

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

5.594%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.0777

smaller = more stable mixing

VEC

3.652

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-3.025

kJ/mol; negative = exothermic mixing

Entropy Norm

0.4280

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.828

Family

Al-based Alloy

Matrix Element

Al · 0.870

Related Tasks

Related computation task IDs (3)

aaacbpkz aaadroxl aaaeczdc

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-680636

Reference Citation

The crystal structure and related material properties of Er(Al10Cr)2 were obtained from the Materials Project database (MP-ID: mp-680636, 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

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Raw CIF Data

# generated using pymatgen
data_Er(Al10Cr)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.22749490
_cell_length_b   10.22749490
_cell_length_c   10.22749490
_cell_angle_alpha   60.00000000
_cell_angle_beta   60.00000000
_cell_angle_gamma   60.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Er(Al10Cr)2
_chemical_formula_sum   'Er2 Al40 Cr4'
_cell_volume   756.47192959
_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  0.00000000  0.00000000  0.00000000  1.0
  Er  Er1  1  0.25000000  0.25000000  0.25000000  1.0
  Al  Al2  1  0.06779700  0.79979600  0.79979600  1.0
  Al  Al3  1  0.45020400  0.91739000  0.18220300  1.0
  Al  Al4  1  0.79979600  0.33261000  0.79979600  1.0
  Al  Al5  1  0.45020400  0.91739000  0.45020400  1.0
  Al  Al6  1  0.18220300  0.45020400  0.45020400  1.0
  Al  Al7  1  0.18220300  0.91739000  0.45020400  1.0
  Al  Al8  1  0.33261000  0.06779700  0.79979600  1.0
  Al  Al9  1  0.79979600  0.06779700  0.33261000  1.0
  Al  Al10  1  0.61207200  0.88792800  0.61207200  1.0
  Al  Al11  1  0.36207200  0.63792800  0.63792800  1.0
  Al  Al12  1  0.91739000  0.18220300  0.45020400  1.0
  Al  Al13  1  0.91739000  0.45020400  0.45020400  1.0
  Al  Al14  1  0.45020400  0.45020400  0.18220300  1.0
  Al  Al15  1  0.63792800  0.36207200  0.36207200  1.0
  Al  Al16  1  0.88792800  0.61207200  0.88792800  1.0
  Al  Al17  1  0.36207200  0.63792800  0.36207200  1.0
  Al  Al18  1  0.88792800  0.61207200  0.61207200  1.0
  Al  Al19  1  0.33261000  0.79979600  0.06779700  1.0
  Al  Al20  1  0.06779700  0.79979600  0.33261000  1.0
  Al  Al21  1  0.63792800  0.36207200  0.63792800  1.0
  Al  Al22  1  0.45020400  0.45020400  0.91739000  1.0
  Al  Al23  1  0.79979600  0.79979600  0.33261000  1.0
  Al  Al24  1  0.06779700  0.33261000  0.79979600  1.0
  Al  Al25  1  0.63792800  0.63792800  0.36207200  1.0
  Al  Al26  1  0.12500000  0.12500000  0.62500000  1.0
  Al  Al27  1  0.33261000  0.79979600  0.79979600  1.0
  Al  Al28  1  0.36207200  0.36207200  0.63792800  1.0
  Al  Al29  1  0.61207200  0.88792800  0.88792800  1.0
  Al  Al30  1  0.61207200  0.61207200  0.88792800  1.0
  Al  Al31  1  0.91739000  0.45020400  0.18220300  1.0
  Al  Al32  1  0.79979600  0.06779700  0.79979600  1.0
  Al  Al33  1  0.88792800  0.88792800  0.61207200  1.0
  Al  Al34  1  0.79979600  0.33261000  0.06779700  1.0
  Al  Al35  1  0.12500000  0.12500000  0.12500000  1.0
  Al  Al36  1  0.45020400  0.18220300  0.45020400  1.0
  Al  Al37  1  0.45020400  0.18220300  0.91739000  1.0
  Al  Al38  1  0.18220300  0.45020400  0.91739000  1.0
  Al  Al39  1  0.62500000  0.12500000  0.12500000  1.0
  Al  Al40  1  0.79979600  0.79979600  0.06779700  1.0
  Al  Al41  1  0.12500000  0.62500000  0.12500000  1.0
  Cr  Cr42  1  0.62500000  0.62500000  0.62500000  1.0
  Cr  Cr43  1  0.62500000  0.12500000  0.62500000  1.0
  Cr  Cr44  1  0.62500000  0.62500000  0.12500000  1.0
  Cr  Cr45  1  0.12500000  0.62500000  0.62500000  1.0

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