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Ta4B3C2

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-3297079 · Space group: Cmcm (#63)

Basic Information

Formula
Ta4B3C2
MP-ID
mp-3297079
Elements
3
Sites
18
Density
13.6887
g/cm³
Volume
189.30
ų
Cell a
18.7742
Å
Cell b
3.2284
Å
Cell c
3.1349
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
94.93
°
Space Group
Cmcm
Point Group
mmm
Crystal System
Orthorhombic
Bravais Lattice
Orthorhombic 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
4.72 18.7047 11.4 (1,0,0)
9.46 9.3524 1.2 (2,0,0)
27.74 3.2164 23.3 (0,1,0)
28.56 3.1253 6.6 (1,1,0)
28.63 3.1175 2.9 (6,0,0)
31.95 2.8008 3.4 (3,0,1)
32.40 2.7633 23.8 (3,1,0)
33.54 2.6721 4.3 (7,0,0)
34.44 2.6039 100.0 (4,0,1)
35.20 2.5497 39.8 (4,1,0)
37.43 2.4028 7.4 (5,0,1)
38.45 2.3414 8.8 (5,1,0)
38.50 2.3381 30.1 (8,0,0)
40.17 2.2450 55.6 (0,1,1)
40.77 2.2133 2.4 (1,1,1)
41.95 2.1538 20.5 (2,1,1)
42.06 2.1481 8.7 (6,1,0)
42.06 2.1481 8.7 (7,-1,0)
43.55 2.0783 8.7 (9,0,0)
43.67 2.0729 19.1 (3,1,1)
45.88 1.9780 8.7 (4,1,1)
45.98 1.9736 5.8 (7,1,0)
54.98 1.6702 7.1 (7,1,1)
57.06 1.6142 16.4 (1,-2,0)
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Energy Properties

Formation Energy/atom
-0.73714
eV/atom
Energy/atom
-26.99279
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-26.9928
eV/atom
Volume/atom
10.52
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
0.0002
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
Ta · 0.444
Element Family
5d-TM
Solute Fraction
0.556
Interstitial Fraction
0.556

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0609
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.8200
J/mol·K
Ω Parameter
0.4260
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
27.481%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.4140
smaller = more stable mixing
VEC
4.111
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-64.077
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9656
SS Former
0
Phase Tendency
AM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.482
Family
Ta-rich Multi-Component
Matrix Element
Ta · 0.444

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-3297079
Reference Citation

The crystal structure and related material properties of Ta4B3C2 were obtained from the Materials Project database (MP-ID: mp-3297079, 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_Ta4B3C2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   18.77423158
_cell_length_b   3.22834684
_cell_length_c   3.13485595
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   94.93227243
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta4B3C2
_chemical_formula_sum   'Ta8 B6 C4'
_cell_volume   189.29920146
_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
  Ta  Ta0  1  0.92813254  0.46406577  0.25000000  1.0
  Ta  Ta1  1  0.21102133  0.60551166  0.25000000  1.0
  Ta  Ta2  1  0.43853716  0.71927058  0.25000000  1.0
  Ta  Ta3  1  0.67775209  0.83887605  0.25000000  1.0
  Ta  Ta4  1  0.32224791  0.16112495  0.74999900  1.0
  Ta  Ta5  1  0.56146284  0.28073042  0.74999900  1.0
  Ta  Ta6  1  0.78897867  0.39448934  0.74999900  1.0
  Ta  Ta7  1  0.07186746  0.53593523  0.74999900  1.0
  B  B8  1  0.02365658  0.01182829  0.25000000  1.0
  B  B9  1  0.12065075  0.06032637  0.25000000  1.0
  B  B10  1  0.82706352  0.91353226  0.25000000  1.0
  B  B11  1  0.17293648  0.08646874  0.74999900  1.0
  B  B12  1  0.87934925  0.93967463  0.74999900  1.0
  B  B13  1  0.97634342  0.98817271  0.74999900  1.0
  C  C14  1  0.32439540  0.66219970  0.25000000  1.0
  C  C15  1  0.55968926  0.77984563  0.25000000  1.0
  C  C16  1  0.44031074  0.22015537  0.74999900  1.0
  C  C17  1  0.67560460  0.33780130  0.74999900  1.0
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