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Ca6Cu2Sn7

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-579544 · Space group: C2/m (#12)

Basic Information

Formula
Ca6Cu2Sn7
MP-ID
mp-579544
Elements
3
Sites
15
Density
4.9589
g/cm³
Volume
401.34
ų
Cell a
4.5827
Å
Cell b
7.4590
Å
Cell c
12.3755
Å
α Angle
93.69
°
β Angle
90.02
°
γ Angle
108.02
°
Space Group
C2/m
Point Group
2/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
7.16 12.3470 68.1 (0,0,1)
14.00 6.3276 2.1 (0,1,-1)
14.35 6.1735 29.6 (0,0,2)
14.84 5.9676 64.6 (0,1,1)
18.42 4.8167 1.5 (0,1,-2)
19.71 4.5033 9.3 (0,1,2)
20.36 4.3629 27.7 (1,-1,0)
20.38 4.3568 28.1 (1,0,0)
21.59 4.1157 58.2 (0,0,3)
21.74 4.0876 32.0 (1,-1,-1)
21.78 4.0812 31.5 (1,0,1)
24.75 3.5976 1.9 (1,-1,2)
24.76 3.5961 1.9 (1,0,-2)
25.17 3.5383 1.7 (0,2,0)
25.72 3.4642 18.2 (0,2,-1)
25.77 3.4573 1.1 (0,1,3)
27.09 3.2911 4.6 (1,-2,0)
27.16 3.2833 4.5 (1,1,0)
28.21 3.1638 2.2 (0,2,-2)
28.39 3.1436 4.9 (1,-2,-1)
28.46 3.1362 4.8 (1,1,1)
29.53 3.0247 35.2 (1,-1,3)
29.54 3.0244 34.8 (1,0,-3)
29.95 2.9838 21.4 (0,2,2)
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Energy Properties

Formation Energy/atom
-0.54719
eV/atom
Energy/atom
-3.76712
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-16.4247
eV/atom
Volume/atom
26.76
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
0.0000
μB
Mag. Ordering
Unknown
Mag. Sites
0
Magnetization/Volume
0.000000
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Sn · 0.467
Element Family
PostTransition-Noble
Solute Fraction
0.533
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.9908
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.2378
J/mol·K
Ω Parameter
0.2193
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
15.698%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.4642
smaller = more stable mixing
VEC
4.133
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-32.412
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9019
SS Former
0
Phase Tendency
AM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.678
Family
Sn-rich Multi-Component
Matrix Element
Sn · 0.467

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-579544
Reference Citation

The crystal structure and related material properties of Ca6Cu2Sn7 were obtained from the Materials Project database (MP-ID: mp-579544, 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_Ca6Cu2Sn7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.58270435
_cell_length_b   7.45900617
_cell_length_c   12.37547500
_cell_angle_alpha   93.68924073
_cell_angle_beta   90.02378772
_cell_angle_gamma   108.02330945
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca6Cu2Sn7
_chemical_formula_sum   'Ca6 Cu2 Sn7'
_cell_volume   401.34053330
_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
  Ca  Ca0  1  0.53881444  0.07837194  0.70126967  1.0
  Ca  Ca1  1  0.19572131  0.39193572  0.29431779  1.0
  Ca  Ca2  1  0.80427869  0.60806428  0.70568221  1.0
  Ca  Ca3  1  0.63708271  0.27353148  0.00145976  1.0
  Ca  Ca4  1  0.46118556  0.92162806  0.29873033  1.0
  Ca  Ca5  1  0.36291729  0.72646852  0.99854024  1.0
  Cu  Cu6  1  0.83123524  0.65985162  0.38954465  1.0
  Cu  Cu7  1  0.16876476  0.34014838  0.61045535  1.0
  Sn  Sn8  1  0.65940182  0.31890294  0.48170465  1.0
  Sn  Sn9  1  0.81745193  0.63480679  0.17663678  1.0
  Sn  Sn10  1  0.01084824  0.02150115  0.11778209  1.0
  Sn  Sn11  1  0.18254807  0.36519321  0.82336322  1.0
  Sn  Sn12  1  -0.00000000  -0.00000000  0.50000000  1.0
  Sn  Sn13  1  0.98915176  0.97849885  0.88221791  1.0
  Sn  Sn14  1  0.34059818  0.68109706  0.51829535  1.0
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