Eu2Ru2O7

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-637431 · Space group: Fd-3m (#227)

Materials Project API

Basic Information

Formula

Eu2Ru2O7

MP-ID

mp-637431

Elements

Sites

Density

7.4706

g/cm³

Volume

274.76

Å³

Cell a

7.2959

Cell b

7.2769

Cell c

7.2957

α Angle

60.09

β Angle

60.25

γ Angle

60.09

Space Group

Fd-3m

Point Group

m-3m

Crystal System

Cubic

Bravais Lattice

Stability

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 24)

2θ	d (Å)	I	hkl
14.84	5.9710	2.5	(1,0,0)
14.84	5.9707	2.5	(0,0,1)
14.90	5.9455	2.4	(0,1,0)
14.90	5.9455	2.4	(1,1,1)
29.93	2.9855	99.9	(2,0,0)
29.93	2.9854	99.9	(0,0,2)
30.06	2.9727	100.0	(0,2,0)
30.06	2.9727	100.0	(2,2,2)
34.76	2.5810	44.9	(0,2,2)
34.76	2.5810	44.9	(2,2,0)
34.80	2.5779	44.3	(2,0,2)
37.87	2.3756	1.7	(2,0,-1)
37.87	2.3755	1.7	(1,0,-2)
37.97	2.3696	1.7	(2,-1,0)
37.97	2.3696	1.7	(3,1,1)
37.97	2.3695	1.7	(1,1,3)
37.97	2.3695	1.7	(0,1,-2)
38.05	2.3648	1.6	(1,-2,0)
38.05	2.3648	1.6	(3,2,2)
38.05	2.3647	1.6	(0,2,-1)
38.05	2.3647	1.6	(2,2,3)
38.11	2.3612	1.7	(1,3,1)
38.11	2.3612	1.7	(2,3,2)
49.80	1.8309	30.6	(2,0,-2)

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Energy Properties

Formation Energy/atom

-2.27439

eV/atom

Energy/atom

-8.97992

eV/atom

Energy above Hull

0.0867

eV/atom

Uncorrected Energy

-17.5785

eV/atom

Volume/atom

12.49

Å³

c/a Ratio

1.0000

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

24.5428

μB

Mag. Ordering

FiM

Mag. Sites

Magnetization/Volume

0.089320

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

O · 0.636

Element Family

Metalloid-Nonmetal

Solute Fraction

0.364

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.9075

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

7.5452

J/mol·K

Ω Parameter

0.0000

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

52.269%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.8897

smaller = more stable mixing

VEC

5.273

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

0.000

kJ/mol; negative = exothermic mixing

Entropy Norm

0.8261

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.504

Family

O-rich Multi-Component

Matrix Element

O · 0.636

Related Tasks

Related computation task IDs (5)

aaadnlso aaadtbjn aaaetpeh aaafbtkl aaagaphg

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-637431

Reference Citation

The crystal structure and related material properties of Eu2Ru2O7 were obtained from the Materials Project database (MP-ID: mp-637431, 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_Eu2Ru2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.29589244
_cell_length_b   7.27687521
_cell_length_c   7.29564583
_cell_angle_alpha   60.08508438
_cell_angle_beta   60.25250008
_cell_angle_gamma   60.08662093
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Eu2Ru2O7
_chemical_formula_sum   'Eu4 Ru4 O14'
_cell_volume   274.76316020
_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
  Eu  Eu0  1  0.62500000  0.62500000  0.12500000  1.0
  Eu  Eu1  1  0.62500000  0.62500000  0.62500000  1.0
  Eu  Eu2  1  0.12500000  0.62500000  0.62500000  1.0
  Eu  Eu3  1  0.62500000  0.12500000  0.62500000  1.0
  Ru  Ru4  1  0.12500000  0.12500000  0.12500000  1.0
  Ru  Ru5  1  0.62500000  0.12500000  0.12500000  1.0
  Ru  Ru6  1  0.12500000  0.62500000  0.12500000  1.0
  Ru  Ru7  1  0.12500000  0.12500000  0.62500000  1.0
  O  O8  1  0.45139842  0.05080614  0.04746790  1.0
  O  O9  1  0.79863069  0.79960377  0.20256295  1.0
  O  O10  1  0.45014107  0.04983045  0.45016536  1.0
  O  O11  1  0.20257874  0.79959765  0.79862592  1.0
  O  O12  1  0.04744894  0.05081021  0.45142068  1.0
  O  O13  1  0.04383186  0.45622629  0.04383539  1.0
  O  O14  1  0.04742126  0.45040235  0.45137408  1.0
  O  O15  1  0.75001341  0.74998243  0.74997193  1.0
  O  O16  1  0.79860158  0.19919386  0.20253210  1.0
  O  O17  1  0.20616814  0.79377371  0.20616461  1.0
  O  O18  1  0.49998659  0.50001757  0.50002807  1.0
  O  O19  1  0.45136931  0.45039623  0.04743705  1.0
  O  O20  1  0.79985893  0.20016955  0.79983464  1.0
  O  O21  1  0.20255106  0.19918979  0.79857932  1.0

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