Eu2SiO5
High-Entropy Materials HEA Traditional Materials TRAMP-ID: mp-867966 · Space group: C2/c (#15)
Basic Information
Formula
Eu2SiO5
MP-ID
mp-867966
Elements
3
Sites
32
Density
5.8158
g/cm³
Volume
470.55
ų
Cell a
8.1765
Å
Cell b
8.1765
Å
Cell c
10.7789
Å
α Angle
61.24
°
β Angle
61.24
°
γ Angle
50.45
°
Space Group
C2/c
Point Group
2/m
Crystal System
Monoclinic
Bravais Lattice
mC
Stability
No
Packing Fraction
-
X-ray Diffraction
Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; Cu Kα ; λ=1.5418 Å
Diffraction Peaks (Top 24)
| 2θ | d (Å) | I | hkl |
|---|---|---|---|
| 14.14 | 6.2639 | 26.9 | (1,1,0) |
| 14.54 | 6.0903 | 35.7 | (1,0,0) |
| 15.26 | 5.8065 | 1.1 | (1,0,1) |
| 16.89 | 5.2496 | 1.3 | (1,1,2) |
| 19.45 | 4.5640 | 2.9 | (0,0,2) |
| 19.50 | 4.5519 | 1.8 | (1,0,-1) |
| 21.09 | 4.2121 | 25.2 | (1,0,2) |
| 22.14 | 4.0152 | 100.0 | (2,1,1) |
| 23.56 | 3.7762 | 3.5 | (2,1,2) |
| 24.47 | 3.6384 | 57.5 | (2,2,2) |
| 24.86 | 3.5821 | 9.1 | (2,1,0) |
| 25.56 | 3.4847 | 14.8 | (1,-1,0) |
| 27.28 | 3.2691 | 2.7 | (1,0,-2) |
| 27.40 | 3.2555 | 62.5 | (1,-1,1) |
| 28.50 | 3.1320 | 2.9 | (2,2,0) |
| 28.54 | 3.1275 | 81.9 | (2,1,3) |
| 29.22 | 3.0561 | 36.2 | (1,0,3) |
| 29.33 | 3.0452 | 36.6 | (2,0,0) |
| 29.72 | 3.0056 | 99.1 | (1,1,-2) |
| 30.80 | 2.9033 | 14.5 | (2,0,2) |
| 32.32 | 2.7697 | 28.2 | (1,-1,2) |
| 32.89 | 2.7230 | 11.2 | (3,2,2) |
| 33.34 | 2.6876 | 18.0 | (2,0,-1) |
| 33.91 | 2.6435 | 19.4 | (1,1,4) |
Energy Properties
Formation Energy/atom
-3.27298
eV/atom
Energy/atom
-9.61565
eV/atom
Energy above Hull
0.1076
eV/atom
Uncorrected Energy
-9.1863
eV/atom
Volume/atom
14.70
ų
c/a Ratio
1.3183
Electronic Properties
Metallic
Metal
Band Gap
0
eV
Direct Gap
No
CBM
N/A
eV
Magnetic Properties
Magnetic
Yes
Total Mag. Moment
47.9998
μB
Mag. Ordering
FiM
Mag. Sites
12
Magnetization/Volume
0.102010
μB/ų
Elastic Properties
Elastic data not available
Feature Analysis
Composition Overview
Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.625
Element Family
Metalloid-Nonmetal
Solute Fraction
0.375
Interstitial Fraction
0.125
High-Entropy Alloy Features
Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.9003
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
7.4847
J/mol·K
Ω Parameter
0.0000
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
54.169%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.9923
smaller = more stable mixing
VEC
4.750
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.000
kJ/mol; negative = exothermic mixing
Entropy Norm
0.8194
SS Former
0
Phase Tendency
IM
Traditional Material Features
ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.475
Family
Interstitial Alloy
Matrix Element
O · 0.625
Related Tasks
Citation & References
Materials Project Page
https://materialsproject.org/materials/mp-867966
Reference Citation
The crystal structure and related material properties of Eu2SiO5 were obtained from the Materials Project database (MP-ID: mp-867966, 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
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Raw CIF Data
# generated using pymatgen
data_Eu2SiO5
_symmetry_space_group_name_H-M 'P 1'
_cell_length_a 8.17651671
_cell_length_b 8.17651671
_cell_length_c 10.77885064
_cell_angle_alpha 61.24086201
_cell_angle_beta 61.24086201
_cell_angle_gamma 50.45058418
_symmetry_Int_Tables_number 1
_chemical_formula_structural Eu2SiO5
_chemical_formula_sum 'Eu8 Si4 O20'
_cell_volume 470.55248097
_cell_formula_units_Z 4
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 0.76112100 0.52822200 0.16382400 1.0
Eu Eu1 1 0.21381900 0.70858500 0.46693300 1.0
Eu Eu2 1 0.29141500 0.78618100 0.03306700 1.0
Eu Eu3 1 0.52822200 0.76112100 0.66382400 1.0
Eu Eu4 1 0.47177800 0.23887900 0.33617600 1.0
Eu Eu5 1 0.70858500 0.21381900 0.96693300 1.0
Eu Eu6 1 0.78618100 0.29141500 0.53306700 1.0
Eu Eu7 1 0.23887900 0.47177800 0.83617600 1.0
Si Si8 1 0.90726700 0.73182600 0.30598800 1.0
Si Si9 1 0.73182600 0.90726700 0.80598800 1.0
Si Si10 1 0.26817400 0.09273300 0.19401200 1.0
Si Si11 1 0.09273300 0.26817400 0.69401200 1.0
O O12 1 0.73248700 0.86847000 0.43273800 1.0
O O13 1 0.91052800 0.90523300 0.14308100 1.0
O O14 1 0.84837100 0.56295900 0.32401400 1.0
O O15 1 0.86847000 0.73248700 0.93273800 1.0
O O16 1 0.90523300 0.91052800 0.64308100 1.0
O O17 1 0.40075400 0.84008400 0.17961000 1.0
O O18 1 0.56295900 0.84837100 0.82401400 1.0
O O19 1 0.57611000 0.39124400 0.39442100 1.0
O O20 1 0.60875600 0.42389000 0.10557900 1.0
O O21 1 0.15991600 0.59924600 0.32039000 1.0
O O22 1 0.84008400 0.40075400 0.67961000 1.0
O O23 1 0.39124400 0.57611000 0.89442100 1.0
O O24 1 0.42389000 0.60875600 0.60557900 1.0
O O25 1 0.43704100 0.15162900 0.17598600 1.0
O O26 1 0.59924600 0.15991600 0.82039000 1.0
O O27 1 0.09476700 0.08947200 0.35691900 1.0
O O28 1 0.13153000 0.26751300 0.06726200 1.0
O O29 1 0.15162900 0.43704100 0.67598600 1.0
O O30 1 0.08947200 0.09476700 0.85691900 1.0
O O31 1 0.26751300 0.13153000 0.56726200 1.0
