EuCoGe3

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-10690 · Space group: I4mm (#107)

Materials Project API

Basic Information

Formula

EuCoGe3

MP-ID

mp-10690

Elements

Sites

Density

7.8542

g/cm³

Volume

90.66

Å³

Cell a

4.2886

Cell b

4.2886

Cell c

5.7874

α Angle

111.75

β Angle

111.75

γ Angle

90.00

Space Group

I4mm

Point Group

4mm

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 24)

2θ	d (Å)	I	hkl
22.61	3.9326	8.1	(1,0,0)
29.45	3.0325	14.2	(1,1,-1)
34.38	2.6085	41.3	(1,0,1)
34.73	2.5829	100.0	(1,1,0)
36.46	2.4646	15.4	(0,0,2)
42.14	2.1443	53.5	(2,0,-1)
47.54	1.9126	7.9	(1,1,1)
48.35	1.8826	1.4	(2,1,-2)
50.98	1.7915	14.4	(1,0,2)
55.47	1.6565	17.8	(2,1,0)
55.47	1.6565	2.5	(2,-1,-2)
56.92	1.6177	16.8	(2,0,1)
61.12	1.5163	17.3	(2,2,-2)
64.50	1.4447	6.7	(1,1,2)
64.50	1.4447	6.7	(1,-1,-3)
68.22	1.3748	3.0	(2,1,1)
68.22	1.3748	8.9	(2,-1,2)
69.28	1.3562	1.8	(3,1,-2)
70.36	1.3381	4.3	(1,0,3)
72.04	1.3109	3.5	(3,0,0)
72.04	1.3109	1.2	(3,0,-3)
72.25	1.3076	8.8	(3,1,-1)
72.25	1.3076	14.7	(3,-1,0)
73.30	1.2914	2.0	(2,2,0)

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Energy Properties

Formation Energy/atom

-0.45121

eV/atom

Energy/atom

-19.12542

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-19.1254

eV/atom

Volume/atom

18.13

Å³

c/a Ratio

1.3495

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

6.7529

μB

Mag. Ordering

Unknown

Mag. Sites

Magnetization/Volume

0.074490

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Ge · 0.600

Element Family

PostTransition-Noble

Solute Fraction

0.400

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.9503

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

7.9005

J/mol·K

Ω Parameter

6.1905

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

17.518%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.3150

smaller = more stable mixing

VEC

5.600

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

1.659

kJ/mol; negative = exothermic mixing

Entropy Norm

0.8650

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.534

Family

Ge-rich Multi-Component

Matrix Element

Ge · 0.600

Related Tasks

Related computation task IDs (5)

aaadmiim aaadsyiz aaaemgsh aaaeqpvm aaafwxep

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-10690

Reference Citation

The crystal structure and related material properties of EuCoGe3 were obtained from the Materials Project database (MP-ID: mp-10690, 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_EuCoGe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.28863625
_cell_length_b   4.28863648
_cell_length_c   5.78739013
_cell_angle_alpha   111.74741728
_cell_angle_beta   111.74741309
_cell_angle_gamma   89.99999510
_symmetry_Int_Tables_number   1
_chemical_formula_structural   EuCoGe3
_chemical_formula_sum   'Eu1 Co1 Ge3'
_cell_volume   90.66108411
_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  0.99712673  0.99712673  0.99425247  1.0
  Co  Co1  1  0.65731928  0.65731928  0.31463955  1.0
  Ge  Ge2  1  0.42741128  0.42741128  0.85482156  1.0
  Ge  Ge3  1  0.25062135  0.75062135  0.50124471  1.0
  Ge  Ge4  1  0.75062135  0.25062135  0.50124471  1.0

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