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Na2SnAsCO7

High-Entropy Materials HEA

MP-ID: mp-772495 · Space group: P2_1/m (#11)

Basic Information

Formula
Na2SnAsCO7
MP-ID
mp-772495
Elements
5
Sites
24
Density
3.3694
g/cm³
Volume
358.41
ų
Cell a
7.1210
Å
Cell b
5.4186
Å
Cell c
9.2894
Å
α Angle
89.22
°
β Angle
90.00
°
γ Angle
90.00
°
Space Group
P2_1/m
Point Group
2/m
Crystal System
Monoclinic
Bravais Lattice
Monoclinic P
Stability
No
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
9.52 9.2885 100.0 (0,0,1)
15.68 5.6513 20.9 (1,0,1)
18.85 4.7082 15.6 (0,1,1)
19.08 4.6525 13.4 (0,1,-1)
19.11 4.6442 1.1 (0,0,2)
20.60 4.3119 9.8 (1,1,0)
22.64 3.9274 8.6 (1,1,1)
25.01 3.5605 35.1 (2,0,0)
25.08 3.5502 19.3 (0,1,2)
25.43 3.5025 36.5 (0,1,-2)
26.82 3.3246 17.6 (2,0,1)
28.08 3.1773 8.9 (1,1,2)
28.84 3.0962 4.7 (0,0,3)
31.50 2.8399 15.8 (2,1,1)
31.64 2.8275 18.7 (2,1,-1)
31.67 2.8257 6.9 (2,0,2)
33.07 2.7091 22.3 (0,2,0)
33.13 2.7042 3.3 (0,1,3)
33.53 2.6725 9.2 (0,1,-3)
34.36 2.6103 2.5 (0,2,1)
34.62 2.5912 8.5 (0,2,-1)
35.51 2.5281 12.4 (1,1,3)
35.71 2.5140 6.4 (2,1,2)
35.97 2.4969 8.0 (2,1,-2)
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Energy Properties

Formation Energy/atom
-1.90488
eV/atom
Energy/atom
-6.50737
eV/atom
Energy above Hull
0.0736
eV/atom
Uncorrected Energy
-6.1066
eV/atom
Volume/atom
14.93
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
0.0212
μB
Mag. Ordering
NM
Mag. Sites
0
Magnetization/Volume
0.000060
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.583
Element Family
Metalloid-Nonmetal
Solute Fraction
0.417
Interstitial Fraction
0.083

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.2343
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
10.2617
J/mol·K
Ω Parameter
0.7447
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
51.970%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.9546
smaller = more stable mixing
VEC
3.417
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-7.514
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7669
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (3)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-772495
Reference Citation

The crystal structure and related material properties of Na2SnAsCO7 were obtained from the Materials Project database (MP-ID: mp-772495, 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_Na2SnAsCO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.12103100
_cell_length_b   5.41863900
_cell_length_c   9.28934817
_cell_angle_alpha   89.21575774
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2SnAsCO7
_chemical_formula_sum   'Na4 Sn2 As2 C2 O14'
_cell_volume   358.40796425
_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
  Na  Na0  1  0.50018100  0.23158700  0.78664900  1.0
  Na  Na1  1  0.99981900  0.23158700  0.78664900  1.0
  Na  Na2  1  0.49981900  0.76841300  0.21335100  1.0
  Na  Na3  1  0.00018100  0.76841300  0.21335100  1.0
  Sn  Sn4  1  0.75000000  0.78291100  0.64293300  1.0
  Sn  Sn5  1  0.25000000  0.21708900  0.35706700  1.0
  As  As6  1  0.25000000  0.71015200  0.58638500  1.0
  As  As7  1  0.75000000  0.28984800  0.41361500  1.0
  C  C8  1  0.75000000  0.72766700  0.93242100  1.0
  C  C9  1  0.25000000  0.27233300  0.06757900  1.0
  O  O10  1  0.25000000  0.29325700  0.93228100  1.0
  O  O11  1  0.75000000  0.94501900  0.86535900  1.0
  O  O12  1  0.75000000  0.53439500  0.84636000  1.0
  O  O13  1  0.05428900  0.82168900  0.67436200  1.0
  O  O14  1  0.44571100  0.82168900  0.67436200  1.0
  O  O15  1  0.75000000  0.19060800  0.59334800  1.0
  O  O16  1  0.25000000  0.38937200  0.58543900  1.0
  O  O17  1  0.75000000  0.61062800  0.41456100  1.0
  O  O18  1  0.25000000  0.80939200  0.40665200  1.0
  O  O19  1  0.55428900  0.17831100  0.32563800  1.0
  O  O20  1  0.94571100  0.17831100  0.32563800  1.0
  O  O21  1  0.25000000  0.46560500  0.15364000  1.0
  O  O22  1  0.25000000  0.05498100  0.13464100  1.0
  O  O23  1  0.75000000  0.70674300  0.06771900  1.0
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