EuNiGe2

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-1080556 · Space group: Cmcm (#63)

Materials Project API

Basic Information

Formula

EuNiGe2

MP-ID

mp-1080556

Elements

Sites

Density

7.7122

g/cm³

Volume

153.28

Å³

Cell a

8.7603

Cell b

8.7603

Cell c

4.1850

α Angle

90.00

β Angle

90.00

γ Angle

151.49

Space Group

Cmcm

Point Group

mmm

Crystal System

Orthorhombic

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
10.42	8.4906	3.2	(1,-1,0)
20.93	4.2453	1.9	(2,-2,0)
23.70	3.7538	6.6	(1,-1,1)
25.97	3.4309	5.0	(2,-1,0)
29.98	2.9803	4.2	(2,-2,1)
30.22	2.9578	21.6	(1,0,1)
31.61	2.8302	6.5	(3,-3,0)
33.58	2.6684	37.9	(3,-2,0)
33.78	2.6533	100.0	(2,-1,1)
38.40	2.3444	30.3	(3,-3,1)
40.08	2.2500	5.7	(3,-2,1)
41.89	2.1568	29.9	(1,1,0)
42.59	2.1227	1.0	(4,-4,0)
43.24	2.0925	27.2	(0,0,2)
48.06	1.8931	11.3	(4,-4,1)
48.22	1.8873	1.9	(4,-3,1)
48.69	1.8701	2.1	(2,0,1)
51.13	1.7865	1.7	(2,-1,2)
52.36	1.7473	1.7	(3,-1,1)
52.97	1.7287	14.3	(5,-4,0)
53.41	1.7155	3.0	(4,-2,0)
54.54	1.6826	2.8	(3,-3,2)
55.83	1.6466	17.3	(3,-2,2)
57.70	1.5977	3.5	(5,-4,1)

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Energy Properties

Formation Energy/atom

-0.60585

eV/atom

Energy/atom

-6.93442

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-6.9344

eV/atom

Volume/atom

19.16

Å³

c/a Ratio

0.4777

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

13.6705

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.089190

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Ge · 0.500

Element Family

PostTransition-Noble

Solute Fraction

0.500

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.0397

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

8.6442

J/mol·K

Ω Parameter

16.4541

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

18.696%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.3388

smaller = more stable mixing

VEC

6.250

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

0.690

kJ/mol; negative = exothermic mixing

Entropy Norm

0.9464

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.469

Family

Ge-rich Multi-Component

Matrix Element

Ge · 0.500

Related Tasks

Related computation task IDs (5)

aaadndze aaadrbbc aaadxige aaaeubbz aaafskkq

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-1080556

Reference Citation

The crystal structure and related material properties of EuNiGe2 were obtained from the Materials Project database (MP-ID: mp-1080556, 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_EuNiGe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.76025273
_cell_length_b   8.76025273
_cell_length_c   4.18499800
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   151.49411644
_symmetry_Int_Tables_number   1
_chemical_formula_structural   EuNiGe2
_chemical_formula_sum   'Eu2 Ni2 Ge4'
_cell_volume   153.27578695
_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  0.89214700  0.10785300  0.75000000  1.0
  Eu  Eu1  1  0.10785300  0.89214700  0.25000000  1.0
  Ni  Ni2  1  0.68103100  0.31896900  0.75000000  1.0
  Ni  Ni3  1  0.31896900  0.68103100  0.25000000  1.0
  Ge  Ge4  1  0.54373100  0.45626900  0.75000000  1.0
  Ge  Ge5  1  0.45626900  0.54373100  0.25000000  1.0
  Ge  Ge6  1  0.24955300  0.75044700  0.75000000  1.0
  Ge  Ge7  1  0.75044700  0.24955300  0.25000000  1.0

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