Er2CuRu

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-862944 · Space group: Fm-3m (#225)

Materials Project API

Basic Information

Formula

Er2CuRu

MP-ID

mp-862944

Elements

Sites

Density

10.8122

g/cm³

Volume

76.66

Å³

Cell a

4.7682

Cell b

4.7682

Cell c

4.7682

α Angle

60.00

β Angle

60.00

γ Angle

60.00

Space Group

Fm-3m

Point Group

m-3m

Crystal System

Cubic

Bravais Lattice

Stability

Yes

Packing Fraction

0.7405

X-ray Diffraction

Diffraction Pattern

Target / Radiation

X-axis: 2θ (°); Y-axis: relative intensity; Cu Kα ; λ=1.5418 Å

Diffraction Peaks (Top 9)

2θ	d (Å)	I	hkl
22.84	3.8932	1.2	(1,1,1)
26.44	3.3716	12.2	(1,1,0)
37.73	2.3841	100.0	(2,1,1)
46.66	1.9466	3.7	(2,2,2)
54.43	1.6858	17.2	(2,2,0)
61.50	1.5078	5.2	(3,2,1)
68.12	1.3765	34.7	(3,3,2)
80.59	1.1921	10.8	(4,2,2)
86.62	1.1239	2.7	(4,3,3)

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Energy Properties

Formation Energy/atom

-0.38564

eV/atom

Energy/atom

-6.01290

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-26.4365

eV/atom

Volume/atom

19.16

Å³

c/a Ratio

1.0000

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

0.0000

μB

Mag. Ordering

Unknown

Mag. Sites

Magnetization/Volume

0.000000

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Er · 0.500

Element Family

Lanthanide

Solute Fraction

0.500

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.0397

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

8.6442

J/mol·K

Ω Parameter

4.6734

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

14.446%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.4187

smaller = more stable mixing

VEC

10.750

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-3.500

kJ/mol; negative = exothermic mixing

Entropy Norm

0.9464

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.509

Family

Er-rich Multi-Component

Matrix Element

Er · 0.500

Related Tasks

Related computation task IDs (5)

aaachumr aaadwnxj aaaegrhv aaaetddv aaafczio

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-862944

Reference Citation

The crystal structure and related material properties of Er2CuRu were obtained from the Materials Project database (MP-ID: mp-862944, 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

3D Crystal Structure Rendering

Loading 3D structure…

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Raw CIF Data

# generated using pymatgen
data_Er2CuRu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.76821582
_cell_length_b   4.76821582
_cell_length_c   4.76821582
_cell_angle_alpha   60.00000000
_cell_angle_beta   60.00000000
_cell_angle_gamma   60.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Er2CuRu
_chemical_formula_sum   'Er2 Cu1 Ru1'
_cell_volume   76.65715814
_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  -0.00000000  -0.00000000  -0.00000000  1.0
  Er  Er1  1  0.49999900  0.49999900  0.49999900  1.0
  Cu  Cu2  1  0.25000000  0.25000000  0.25000000  1.0
  Ru  Ru3  1  0.75000000  0.75000000  0.75000000  1.0

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