Navigation

HEAS Data Platform · Materials Science Database

Eu2GaCu18Si7

High-Entropy Materials HEA

MP-ID: mp-3297321 · Space group: Cm (#8)

Basic Information

Formula
Eu2GaCu18Si7
MP-ID
mp-3297321
Elements
4
Sites
28
Density
7.5777
g/cm³
Volume
375.62
ų
Cell a
8.1134
Å
Cell b
8.1134
Å
Cell c
8.1059
Å
α Angle
120.40
°
β Angle
120.40
°
γ Angle
89.13
°
Space Group
Cm
Point Group
m
Crystal System
Monoclinic
Bravais Lattice
Monoclinic C
Stability
Yes
Packing Fraction
0.5240

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
13.37 6.6214 1.8 (1,0,0)
13.41 6.6033 2.3 (1,0,-1)
15.33 5.7803 3.1 (1,1,-1)
15.56 5.6935 2.9 (1,-1,0)
21.84 4.0694 6.2 (1,1,0)
21.91 4.0562 5.0 (0,2,-1)
21.91 4.0562 5.0 (2,0,-1)
21.93 4.0526 2.2 (1,1,-2)
22.05 4.0306 39.4 (1,-1,1)
25.59 3.4807 1.0 (2,1,-1)
25.84 3.4484 7.5 (1,0,1)
25.90 3.4407 4.4 (1,0,-2)
25.90 3.4407 4.4 (0,1,-2)
25.90 3.4400 7.3 (2,-1,0)
25.92 3.4374 15.8 (2,-1,-1)
26.93 3.3107 16.7 (2,0,0)
27.01 3.3016 27.7 (2,0,-2)
30.94 2.8901 60.5 (2,2,-2)
31.35 2.8534 5.9 (0,0,2)
31.42 2.8467 8.6 (2,-2,0)
33.97 2.6391 1.4 (1,2,0)
33.97 2.6391 1.4 (2,1,0)
34.05 2.6330 3.4 (0,3,-1)
34.05 2.6330 3.4 (3,0,-1)
Get direct link

Energy Properties

Formation Energy/atom
-0.26519
eV/atom
Energy/atom
-12.59173
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-12.5917
eV/atom
Volume/atom
13.41
ų
c/a Ratio
-

Electronic Properties

Metallic
Metal
Band Gap
0
eV
Direct Gap
No
CBM
N/A
eV

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
13.8081
μB
Mag. Ordering
FM
Mag. Sites
2
Magnetization/Volume
0.036760
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Cu · 0.643
Element Family
3d-TM
Solute Fraction
0.357
Interstitial Fraction
0.250

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.9381
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
7.7995
J/mol·K
Ω Parameter
0.8149
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
12.483%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.1802
smaller = more stable mixing
VEC
8.679
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-13.247
kJ/mol; negative = exothermic mixing
Entropy Norm
0.6767
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-3297321
Reference Citation

The crystal structure and related material properties of Eu2GaCu18Si7 were obtained from the Materials Project database (MP-ID: mp-3297321, 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

BibTeX
@article{Horton2025,
  author  = {Horton, Matthew K. and Huck, Patrick and Yang, Ruo Xi and Munro, Jason M. and Dwaraknath, Shyam and Ganose, Alex M. and Kingsbury, Ryan S. and Wen, Mingjian and Shen, Jimmy X. and Mathis, Tyler S. and Kaplan, Aaron D. and Berket, Karlo and Riebesell, Janosh and George, Janine and Rosen, Andrew S. and Spotte-Smith, Evan W. C. and McDermott, Matthew J. and Cohen, Orion A. and Dunn, Alex and Kuner, Matthew C. and Rignanese, Gian-Marco and Petretto, Guido and Waroquiers, David and Griffin, Sinead M. and Neaton, Jeffrey B. and Chrzan, Daryl C. and Asta, Mark and Hautier, Geoffroy and Cholia, Shreyas and Ceder, Gerbrand and Ong, Shyue Ping and Jain, Anubhav and Persson, Kristin A.},
  title   = {Accelerated data-driven materials science with the Materials Project},
  journal = {Nature Materials},
  year    = {2025},
  volume  = {24},
  number  = {10},
  pages   = {1522--1532},
  month   = {oct},
  doi     = {10.1038/s41563-025-02272-0},
  issn    = {1476-4660},
  url     = {https://doi.org/10.1038/s41563-025-02272-0},
  abstract = {The Materials Project was launched formally in 2011 to drive materials discovery forwards through high-throughput computation and open data. More than a decade later, the Materials Project has become an indispensable tool used by more than 600,000 materials researchers around the world. This Perspective describes how the Materials Project, as a data platform and a software ecosystem, has helped to shape research in data-driven materials science. We cover how sustainable software and computational methods have accelerated materials design while becoming more open source and collaborative in nature. Next, we present cases where the Materials Project was used to understand and discover functional materials. We then describe our efforts to meet the needs of an expanding user base, through technical infrastructure updates ranging from data architecture and cloud resources to interactive web applications. Finally, we discuss opportunities to better aid the research community, with the vision that more accessible and easy-to-understand materials data will result in democratized materials knowledge and an increasingly collaborative community.}
}

3D Crystal Structure Rendering

Loading 3D structure…

Style: Ball & Stick
Raw CIF Data
# generated using pymatgen
data_Eu2GaCu18Si7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.11341732
_cell_length_b   8.11341833
_cell_length_c   8.10593136
_cell_angle_alpha   120.39523612
_cell_angle_beta   120.39524151
_cell_angle_gamma   89.13266102
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Eu2GaCu18Si7
_chemical_formula_sum   'Eu2 Ga1 Cu18 Si7'
_cell_volume   375.61571860
_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  0.74865690  0.74928842  0.99920385  1.0
  Eu  Eu1  1  0.24928842  0.24865690  0.99920385  1.0
  Ga  Ga2  1  0.05718219  0.55718219  0.85703355  1.0
  Cu  Cu3  1  0.06412121  0.20495538  0.26734893  1.0
  Cu  Cu4  1  0.93384129  0.79779131  0.72971797  1.0
  Cu  Cu5  1  0.56594477  0.29574361  0.86229304  1.0
  Cu  Cu6  1  0.43911176  0.70512578  0.14152389  1.0
  Cu  Cu7  1  0.79574361  0.06594477  0.86229304  1.0
  Cu  Cu8  1  0.20512578  0.93911176  0.14152389  1.0
  Cu  Cu9  1  0.70495538  0.56412121  0.26734893  1.0
  Cu  Cu10  1  0.29779131  0.43384129  0.72971797  1.0
  Cu  Cu11  1  0.44045514  0.94045514  0.75009755  1.0
  Cu  Cu12  1  0.20193408  0.70193408  0.26877245  1.0
  Cu  Cu13  1  0.93893464  0.19038924  0.49397067  1.0
  Cu  Cu14  1  0.69038924  0.43893464  0.49397067  1.0
  Cu  Cu15  1  0.55970871  0.05970871  0.25369143  1.0
  Cu  Cu16  1  0.79640206  0.29640206  0.73582938  1.0
  Cu  Cu17  1  0.05936225  0.80923599  0.50189487  1.0
  Cu  Cu18  1  0.30923599  0.55936225  0.50189487  1.0
  Cu  Cu19  1  0.00124274  0.50124274  0.49787547  1.0
  Cu  Cu20  1  0.49813212  0.99813212  0.50006072  1.0
  Si  Si21  1  0.70879994  0.20879994  0.14877994  1.0
  Si  Si22  1  0.56152379  0.70811959  0.50098825  1.0
  Si  Si23  1  0.20811959  0.06152379  0.50098825  1.0
  Si  Si24  1  0.94205656  0.44205656  0.14495099  1.0
  Si  Si25  1  0.29029924  0.79029924  0.85211328  1.0
  Si  Si26  1  0.44027376  0.29136551  0.49845565  1.0
  Si  Si27  1  0.79136551  0.94027376  0.49845565  1.0
Get direct link