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Sr4Si8Os7Pt

High-Entropy Materials HEA

MP-ID: mp-3296771 · Space group: C2 (#5)

Basic Information

Formula
Sr4Si8Os7Pt
MP-ID
mp-3296771
Elements
4
Sites
20
Density
8.9167
g/cm³
Volume
391.42
ų
Cell a
6.1265
Å
Cell b
8.0734
Å
Cell c
8.0742
Å
α Angle
78.58
°
β Angle
90.42
°
γ Angle
89.58
°
Space Group
C2
Point Group
2
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
18.23 4.8653 52.7 (1,0,-1)
18.23 4.8652 52.7 (1,1,0)
18.39 4.8235 51.7 (1,0,1)
18.39 4.8233 51.7 (1,-1,0)
22.47 3.9570 6.6 (0,0,2)
22.47 3.9566 6.6 (0,2,0)
27.26 3.2710 45.1 (1,-1,-2)
27.26 3.2709 45.1 (1,2,1)
27.37 3.2583 45.6 (1,1,2)
27.37 3.2580 45.6 (1,-2,-1)
28.57 3.1245 42.3 (0,2,2)
30.72 2.9107 5.3 (1,1,-2)
30.72 2.9106 5.4 (1,2,-1)
31.01 2.8838 5.3 (1,-1,2)
31.01 2.8837 5.3 (1,-2,1)
32.56 2.7504 15.8 (2,1,1)
32.56 2.7504 15.8 (2,-1,-1)
33.94 2.6410 97.9 (2,1,-1)
34.30 2.6142 94.0 (2,-1,1)
35.11 2.5561 100.0 (0,2,-2)
36.98 2.4308 32.1 (1,0,-3)
36.98 2.4306 32.1 (1,3,0)
37.23 2.4151 32.2 (1,0,3)
37.23 2.4148 32.2 (1,-3,0)
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Energy Properties

Formation Energy/atom
-0.66112
eV/atom
Energy/atom
-28.31898
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-28.3190
eV/atom
Volume/atom
19.57
ų
c/a Ratio
-

Electronic Properties

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

Magnetic Properties

Magnetic
No
Total Mag. Moment
0.0003
μB
Mag. Ordering
NM
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
Si · 0.400
Element Family
Metalloid-Nonmetal
Solute Fraction
0.600
Interstitial Fraction
0.400

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.2056
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
10.0236
J/mol·K
Ω Parameter
4.5035
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
21.737%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.4635
smaller = more stable mixing
VEC
5.300
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-4.772
kJ/mol; negative = exothermic mixing
Entropy Norm
0.8697
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-3296771
Reference Citation

The crystal structure and related material properties of Sr4Si8Os7Pt were obtained from the Materials Project database (MP-ID: mp-3296771, 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_Sr4Si8Os7Pt
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.12649290
_cell_length_b   8.07337731
_cell_length_c   8.07419116
_cell_angle_alpha   78.57580778
_cell_angle_beta   90.41769244
_cell_angle_gamma   89.58040391
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr4Si8Os7Pt
_chemical_formula_sum   'Sr4 Si8 Os7 Pt1'
_cell_volume   391.42315602
_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
  Sr  Sr0  1  0.37591566  0.00031805  0.25384482  1.0
  Sr  Sr1  1  0.87416241  0.50355595  0.75006657  1.0
  Sr  Sr2  1  0.62500849  0.99792652  0.74801523  1.0
  Sr  Sr3  1  0.12500854  0.49989799  0.24981258  1.0
  Si  Si4  1  0.37057674  0.32162476  0.92425127  1.0
  Si  Si5  1  0.87976234  0.17429427  0.07178124  1.0
  Si  Si6  1  0.61367285  0.68901255  0.07157774  1.0
  Si  Si7  1  0.12637964  0.81971628  0.92989935  1.0
  Si  Si8  1  0.63619205  0.32166905  0.43889119  1.0
  Si  Si9  1  0.12361074  0.17985657  0.56983876  1.0
  Si  Si10  1  0.37307825  0.67835268  0.56852288  1.0
  Si  Si11  1  0.87664862  0.81855730  0.42839021  1.0
  Os  Os12  1  0.12487870  0.87812843  0.62817193  1.0
  Os  Os13  1  0.62489875  0.62089665  0.37080093  1.0
  Os  Os14  1  0.87342315  0.12147176  0.37033877  1.0
  Os  Os15  1  0.37556315  0.37764443  0.62662946  1.0
  Os  Os16  1  0.87444393  0.87663713  0.12768012  1.0
  Os  Os17  1  0.37658959  0.62028309  0.87139821  1.0
  Os  Os18  1  0.12507493  0.12155182  0.87165908  1.0
  Pt  Pt19  1  0.62510647  0.37860571  0.12843166  1.0
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