Eu2SiO5

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-867713 · Space group: Pnma (#62)

Materials Project API

Basic Information

Formula

Eu2SiO5

MP-ID

mp-867713

Elements

Sites

Density

6.2444

g/cm³

Volume

438.25

Å³

Cell a

3.7462

Cell b

10.6542

Cell c

10.9803

α Angle

90.00

β Angle

90.00

γ Angle

90.00

Space Group

Pnma

Point Group

mmm

Crystal System

Orthorhombic

Bravais Lattice

Stability

Packing Fraction

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
11.57	7.6463	23.7	(0,1,1)
16.14	5.4901	1.1	(0,0,2)
18.18	4.8803	16.9	(0,1,2)
18.51	4.7928	10.4	(0,2,1)
23.27	3.8232	7.5	(0,2,2)
25.12	3.5455	6.2	(1,0,1)
25.74	3.4615	31.7	(0,1,3)
26.38	3.3791	6.0	(0,3,1)
26.50	3.3641	9.3	(1,1,1)
29.14	3.0643	100.0	(1,2,0)
29.61	3.0167	68.3	(0,2,3)
29.97	2.9819	18.1	(0,3,2)
30.07	2.9716	14.1	(1,1,2)
30.28	2.9516	10.8	(1,2,1)
32.62	2.7451	1.4	(0,0,4)
33.65	2.6636	13.1	(0,4,0)
33.72	2.6583	1.8	(0,1,4)
34.25	2.6180	32.2	(1,0,3)
34.65	2.5885	9.9	(0,4,1)
35.21	2.5488	5.2	(0,3,3)
35.30	2.5424	13.4	(1,1,3)
35.79	2.5091	2.6	(1,3,1)
38.31	2.3496	1.1	(1,2,3)
38.59	2.3330	11.9	(1,3,2)

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Energy Properties

Formation Energy/atom

-3.20178

eV/atom

Energy/atom

-9.54444

eV/atom

Energy above Hull

0.1788

eV/atom

Uncorrected Energy

-9.1151

eV/atom

Volume/atom

13.70

Å³

c/a Ratio

2.9311

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

48.0010

μB

Mag. Ordering

FiM

Mag. Sites

Magnetization/Volume

0.109530

μB/Å³

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

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.427

Family

Interstitial Alloy

Matrix Element

O · 0.625

Related Tasks

Related computation task IDs (1)

aaadzhdc

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-867713

Reference Citation

The crystal structure and related material properties of Eu2SiO5 were obtained from the Materials Project database (MP-ID: mp-867713, 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_Eu2SiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.74619100
_cell_length_b   10.65419500
_cell_length_c   10.98028700
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Eu2SiO5
_chemical_formula_sum   'Eu8 Si4 O20'
_cell_volume   438.25234558
_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  0.25000000  0.09454100  0.28919400  1.0
  Eu  Eu1  1  0.25000000  0.13500200  0.94199700  1.0
  Eu  Eu2  1  0.75000000  0.36499800  0.44199700  1.0
  Eu  Eu3  1  0.75000000  0.40545900  0.78919400  1.0
  Eu  Eu4  1  0.25000000  0.59454100  0.21080600  1.0
  Eu  Eu5  1  0.25000000  0.63500200  0.55800300  1.0
  Eu  Eu6  1  0.75000000  0.86499800  0.05800300  1.0
  Eu  Eu7  1  0.75000000  0.90545900  0.71080600  1.0
  Si  Si8  1  0.25000000  0.18242200  0.62637900  1.0
  Si  Si9  1  0.75000000  0.31757800  0.12637900  1.0
  Si  Si10  1  0.25000000  0.68242200  0.87362100  1.0
  Si  Si11  1  0.75000000  0.81757800  0.37362100  1.0
  O  O12  1  0.75000000  0.00887600  0.89710000  1.0
  O  O13  1  0.25000000  0.03156500  0.65647600  1.0
  O  O14  1  0.25000000  0.22435300  0.47834300  1.0
  O  O15  1  0.75000000  0.21559500  0.62269800  1.0
  O  O16  1  0.75000000  0.23103100  0.25601500  1.0
  O  O17  1  0.25000000  0.26896900  0.75601500  1.0
  O  O18  1  0.25000000  0.28440500  0.12269800  1.0
  O  O19  1  0.75000000  0.27564700  0.97834300  1.0
  O  O20  1  0.75000000  0.46843500  0.15647600  1.0
  O  O21  1  0.25000000  0.49112400  0.39710000  1.0
  O  O22  1  0.75000000  0.50887600  0.60290000  1.0
  O  O23  1  0.25000000  0.53156500  0.84352400  1.0
  O  O24  1  0.25000000  0.72435300  0.02165700  1.0
  O  O25  1  0.75000000  0.71559500  0.87730200  1.0
  O  O26  1  0.75000000  0.73103100  0.24398500  1.0
  O  O27  1  0.25000000  0.76896900  0.74398500  1.0
  O  O28  1  0.25000000  0.78440500  0.37730200  1.0
  O  O29  1  0.75000000  0.77564700  0.52165700  1.0
  O  O30  1  0.75000000  0.96843500  0.34352400  1.0
  O  O31  1  0.25000000  0.99112400  0.10290000  1.0

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