Eu(CoSi)2

High-Entropy Materials HEA Traditional Materials TRA Elasticity Data ELA

MP-ID: mp-672294 · Space group: I4/mmm (#139)

Materials Project API

Basic Information

Formula

Eu(CoSi)2

MP-ID

mp-672294

Elements

Sites

Density

7.0434

g/cm³

Volume

76.86

Å³

Cell a

5.7670

Cell b

5.7670

Cell c

5.7670

α Angle

140.53

β Angle

140.53

γ Angle

57.05

Space Group

I4/mmm

Point Group

4/mmm

Crystal System

Tetragonal

Bravais Lattice

Stability

Yes

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 23)

2θ	d (Å)	I	hkl
24.49	3.6354	52.4	(1,0,-1)
32.51	2.7540	7.3	(1,-1,0)
35.17	2.5518	65.7	(2,1,-2)
35.43	2.5335	19.7	(2,2,-2)
37.16	2.4197	100.0	(2,0,-1)
46.64	1.9473	39.8	(1,-1,1)
50.78	1.7979	17.1	(3,2,-3)
53.37	1.7166	13.3	(2,-1,-1)
59.73	1.5481	27.8	(3,0,-2)
59.91	1.5439	16.4	(3,1,-3)
64.75	1.4398	23.7	(4,2,-3)
68.09	1.3770	12.4	(2,-2,0)
69.24	1.3570	2.2	(4,3,-4)
71.41	1.3210	12.5	(4,1,-3)
73.55	1.2877	2.6	(2,-1,-2)
74.98	1.2667	4.4	(4,4,-4)
77.50	1.2316	1.5	(2,-2,1)
79.01	1.2118	6.3	(3,0,-3)
79.17	1.2098	7.1	(4,0,-2)
80.21	1.1968	19.9	(3,-1,-2)
84.12	1.1508	1.0	(4,4,-5)
87.65	1.1133	2.4	(5,2,-4)
89.69	1.0932	3.6	(4,1,-4)

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Energy Properties

Formation Energy/atom

-0.57443

eV/atom

Energy/atom

-17.08180

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-17.0818

eV/atom

Volume/atom

15.37

Å³

c/a Ratio

1.0000

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

6.9844

μB

Mag. Ordering

Unknown

Mag. Sites

Magnetization/Volume

0.090880

μB/Å³

Elastic Properties

K_VRH

101.060

GPa

G_VRH

77.888

GPa

Young's Modulus E

185.904

GPa

Poisson Ratio ν

0.193

Pugh Ratio K/G

1.298

Vickers Hardness Est.

15.845

GPa

Ductility

Ductile

Anisotropy

0.626

Lame λ

49.135

GPa

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Co · 0.400

Element Family

3d-TM

Solute Fraction

0.600

Interstitial Fraction

0.400

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.0549

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

8.7706

J/mol·K

Ω Parameter

0.6272

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

19.319%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.2761

smaller = more stable mixing

VEC

6.600

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-22.400

kJ/mol; negative = exothermic mixing

Entropy Norm

0.9602

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.606

Family

Co-rich Multi-Component

Matrix Element

Co · 0.400

Elasticity Features

Elastic Modulus Comparison (GPa)

Elastic Features

Elastic Anisotropy A^U

0.6260

Homogeneous Poisson ν

0.1930

Debye Temperature

541.3

Sound Velocity

3,668.6

m/s

Homogeneity

0.1930

Related Tasks

Related computation task IDs (5)

aaadmprp aaadsoei aaaelxnu aaaeutkq aaafsamk

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-672294

Reference Citation

The crystal structure and related material properties of Eu(CoSi)2 were obtained from the Materials Project database (MP-ID: mp-672294, 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_Eu(CoSi)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.76695131
_cell_length_b   5.76695131
_cell_length_c   5.76695131
_cell_angle_alpha   140.52985095
_cell_angle_beta   140.52985095
_cell_angle_gamma   57.04967241
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Eu(CoSi)2
_chemical_formula_sum   'Eu1 Co2 Si2'
_cell_volume   76.85709727
_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
  Eu  Eu0  1  -0.00000000  -0.00000000  0.00000000  1.0
  Co  Co1  1  0.75000000  0.25000000  0.50000000  1.0
  Co  Co2  1  0.25000000  0.75000000  0.50000000  1.0
  Si  Si3  1  0.36253935  0.36253935  0.00000000  1.0
  Si  Si4  1  0.63746065  0.63746065  -0.00000000  1.0

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