U4S2N4O21

High-Entropy Materials HEA

MP-ID: mp-1179503 · Space group: P1 (#1)

Materials Project API

Basic Information

Formula

U4S2N4O21

MP-ID

mp-1179503

Elements

Sites

Density

4.2506

g/cm³

Volume

1,100.30

Å³

Cell a

8.4486

Cell b

8.4705

Cell c

17.8667

α Angle

97.14

β Angle

97.17

γ Angle

117.56

Space Group

Point Group

Crystal System

Triclinic

Bravais Lattice

Triclinic P

Stability

Packing Fraction

0.5240

X-ray Diffraction

Diffraction Pattern

Target / Radiation

X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å

Diffraction Peaks (Top 24)

2θ	d (Å)	I	hkl
10.20	8.6716	14.9	(0,0,2)
12.23	7.2344	100.0	(1,-1,0)
14.10	6.2834	1.5	(0,1,-2)
14.11	6.2746	1.5	(1,0,-2)
15.95	5.5575	5.9	(1,-1,-2)
15.96	5.5527	5.9	(1,-1,2)
20.48	4.3358	4.2	(0,0,4)
20.87	4.2563	4.6	(1,1,0)
20.92	4.2457	3.9	(1,1,-2)
22.40	3.9693	2.6	(1,-2,2)
22.44	3.9626	2.5	(2,-1,-2)
23.92	3.7204	2.5	(1,-1,-4)
23.94	3.7176	2.5	(1,-1,4)
24.23	3.6734	1.9	(0,2,0)
24.28	3.6659	2.0	(0,2,-2)
24.29	3.6636	1.9	(2,0,0)
24.34	3.6575	2.0	(2,0,-2)
24.61	3.6176	1.1	(1,-2,-2)
24.61	3.6172	14.6	(2,-2,0)
24.67	3.6087	1.1	(2,-1,2)
25.43	3.5024	19.2	(1,1,2)
25.56	3.4847	16.9	(1,1,-4)
26.69	3.3395	1.3	(2,-2,-2)
26.71	3.3374	1.3	(2,-2,2)

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Energy Properties

Formation Energy/atom

-1.75672

eV/atom

Energy/atom

-7.90835

eV/atom

Energy above Hull

0.6874

eV/atom

Uncorrected Energy

-7.4430

eV/atom

Volume/atom

17.75

Å³

c/a Ratio

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

16.0122

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.014550

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

O · 0.677

Element Family

Metalloid-Nonmetal

Solute Fraction

0.323

Interstitial Fraction

0.129

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.9691

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

8.0571

J/mol·K

Ω Parameter

8.1327

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

48.241%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.6906

smaller = more stable mixing

VEC

4.296

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

0.249

kJ/mol; negative = exothermic mixing

Entropy Norm

0.6991

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaaeazyb

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-1179503

Reference Citation

The crystal structure and related material properties of U4S2N4O21 were obtained from the Materials Project database (MP-ID: mp-1179503, 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…

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Raw CIF Data

# generated using pymatgen
data_U4S2N4O21
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.44862700
_cell_length_b   8.47046495
_cell_length_c   17.86672782
_cell_angle_alpha   97.13911496
_cell_angle_beta   97.17202902
_cell_angle_gamma   117.55995951
_symmetry_Int_Tables_number   1
_chemical_formula_structural   U4S2N4O21
_chemical_formula_sum   'U8 S4 N8 O42'
_cell_volume   1100.30395072
_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
  U  U0  1  0.89795700  0.43994900  0.33576000  1.0
  U  U1  1  0.44041700  0.89748200  0.33598200  1.0
  U  U2  1  0.10475200  0.56262200  0.66524300  1.0
  U  U3  1  0.56260600  0.10506100  0.66512300  1.0
  U  U4  1  0.10476200  0.56163800  0.16692400  1.0
  U  U5  1  0.56336800  0.10271800  0.16688700  1.0
  U  U6  1  0.89840900  0.43859900  0.83413300  1.0
  U  U7  1  0.43919100  0.89827500  0.83384100  1.0
  S  S8  1  0.25688000  0.74494600  0.00048700  1.0
  S  S9  1  0.74660700  0.25502200  0.00052100  1.0
  S  S10  1  0.74614400  0.25438000  0.50039700  1.0
  S  S11  1  0.25407900  0.74684200  0.50069700  1.0
  N  N12  1  0.16150500  0.16455700  0.47888500  1.0
  N  N13  1  0.84617000  0.84031100  0.50457700  1.0
  N  N14  1  0.73208800  0.72875700  0.00212700  1.0
  N  N15  1  0.26920700  0.27135300  0.99825100  1.0
  N  N16  1  0.62295700  0.62212900  0.17255300  1.0
  N  N17  1  0.37895700  0.37903900  0.82743400  1.0
  N  N18  1  0.36915100  0.36770800  0.32397400  1.0
  N  N19  1  0.63280700  0.63347400  0.67432400  1.0
  O  O20  1  0.75503400  0.38197500  0.44914000  1.0
  O  O21  1  0.38222600  0.75608400  0.44959000  1.0
  O  O22  1  0.24469700  0.61653600  0.55057900  1.0
  O  O23  1  0.61540800  0.24450600  0.55024200  1.0
  O  O24  1  0.38672800  0.75627300  0.94959200  1.0
  O  O25  1  0.75669400  0.38431500  0.94966100  1.0
  O  O26  1  0.61657700  0.24409000  0.05128900  1.0
  O  O27  1  0.24721600  0.61596700  0.05145600  1.0
  O  O28  1  0.15260500  0.64277000  0.29351300  1.0
  O  O29  1  0.64396500  0.15129800  0.29339900  1.0
  O  O30  1  0.85058600  0.35890800  0.70750600  1.0
  O  O31  1  0.35847000  0.85085300  0.70740700  1.0
  O  O32  1  0.31758500  0.92486800  0.05039900  1.0
  O  O33  1  0.92698500  0.31610800  0.05051900  1.0
  O  O34  1  0.68565400  0.07515500  0.95051900  1.0
  O  O35  1  0.07632700  0.68341300  0.95054400  1.0
  O  O36  1  0.92738500  0.31380800  0.55035400  1.0
  O  O37  1  0.31275200  0.92735400  0.55052200  1.0
  O  O38  1  0.07188900  0.69071100  0.45197700  1.0
  O  O39  1  0.69058400  0.07287300  0.45188600  1.0
  O  O40  1  0.85259300  0.35828900  0.20877400  1.0
  O  O41  1  0.35974900  0.85043800  0.20874100  1.0
  O  O42  1  0.15113200  0.64425500  0.79238700  1.0
  O  O43  1  0.64431200  0.15029400  0.79241300  1.0
  O  O44  1  0.78321200  0.57072100  0.31907600  1.0
  O  O45  1  0.57270600  0.78379700  0.32050900  1.0
  O  O46  1  0.22142600  0.43364300  0.68213200  1.0
  O  O47  1  0.43259300  0.22067300  0.68192700  1.0
  O  O48  1  0.22426300  0.43517700  0.18328900  1.0
  O  O49  1  0.43630600  0.22173200  0.18280200  1.0
  O  O50  1  0.77810200  0.56430900  0.81796200  1.0
  O  O51  1  0.56531000  0.77847500  0.81747100  1.0
  O  O52  1  0.97841500  0.67247600  0.13434200  1.0
  O  O53  1  0.67520500  0.97716400  0.13477300  1.0
  O  O54  1  0.02621300  0.32854700  0.86595700  1.0
  O  O55  1  0.32897700  0.02514300  0.86649500  1.0
  O  O56  1  0.02310000  0.32604800  0.36740700  1.0
  O  O57  1  0.32528200  0.02177600  0.36699100  1.0
  O  O58  1  0.97944700  0.67628400  0.63360800  1.0
  O  O59  1  0.67660500  0.98013900  0.63353600  1.0
  O  O60  1  0.04971500  0.05700400  0.43084600  1.0
  O  O61  1  0.93271500  0.92896300  0.56195300  1.0

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