Sr4Si8Os7Pt

High-Entropy Materials HEA

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

Materials Project API

Basic Information

Formula

Sr4Si8Os7Pt

MP-ID

mp-3296771

Elements

Sites

Density

8.9167

g/cm³

Volume

391.42

Å³

Cell a

6.1265

Cell b

8.0734

Cell c

8.0742

α Angle

78.58

β Angle

90.42

γ Angle

89.58

Space Group

Point Group

Crystal System

Monoclinic

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
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)

Get direct link

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

Å³

c/a Ratio

1.3179

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Total Mag. Moment

0.0003

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.000000

μB/Å³

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

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaahfowx

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

3D Crystal Structure Rendering

Loading 3D structure…

Style: Ball & Stick | Drag to rotate · Scroll to zoom · Right-click to pan

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

Get direct link