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Tb4Tm8Co5Pb

High-Entropy Materials HEA

MP-ID: mp-3295954 · Space group: Immm (#71)

Basic Information

Formula
Tb4Tm8Co5Pb
MP-ID
mp-3295954
Elements
4
Sites
18
Density
9.7076
g/cm³
Volume
425.77
ų
Cell a
8.2122
Å
Cell b
8.2122
Å
Cell c
8.2122
Å
α Angle
110.57
°
β Angle
110.85
°
γ Angle
107.03
°
Space Group
Immm
Point Group
mmm
Crystal System
Orthorhombic
Bravais Lattice
Orthorhombic I
Stability
Yes
Packing Fraction
0.6800

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
13.11 6.7554 1.4 (1,0,-1)
23.14 3.8430 2.7 (1,0,-2)
23.19 3.8362 1.3 (2,-1,0)
26.44 3.3715 5.8 (0,2,-2)
27.01 3.3013 2.0 (0,0,2)
29.04 3.0746 5.5 (2,1,-2)
29.05 3.0734 17.2 (1,2,-2)
30.09 2.9703 24.9 (2,-1,-2)
30.18 2.9608 1.4 (1,-2,2)
30.23 2.9569 5.6 (1,-1,-2)
30.31 2.9486 14.2 (1,-1,2)
30.31 2.9486 14.2 (2,-2,1)
32.74 2.7350 100.0 (3,-1,-1)
34.96 2.5664 47.6 (1,2,-3)
35.49 2.5294 46.1 (2,0,-3)
35.57 2.5242 3.3 (0,2,-3)
35.85 2.5048 13.2 (1,0,-3)
35.90 2.5017 25.5 (0,1,-3)
36.81 2.4416 13.5 (2,2,-2)
38.50 2.3385 7.8 (2,-2,-2)
38.64 2.3303 19.2 (2,-2,2)
39.34 2.2901 3.6 (2,2,-3)
40.12 2.2477 3.9 (0,3,-3)
40.84 2.2094 1.3 (2,-1,-3)
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Energy Properties

Formation Energy/atom
-0.25085
eV/atom
Energy/atom
-29.60254
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-29.6025
eV/atom
Volume/atom
23.65
ų
c/a Ratio
-

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
0.9276
μB
Mag. Ordering
FiM
Mag. Sites
17
Magnetization/Volume
0.002180
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Tm · 0.444
Element Family
Lanthanide
Solute Fraction
0.556
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.2110
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
10.0686
J/mol·K
Ω Parameter
11.9424
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
13.900%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.3733
smaller = more stable mixing
VEC
10.500
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
1.429
kJ/mol; negative = exothermic mixing
Entropy Norm
0.8736
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-3295954
Reference Citation

The crystal structure and related material properties of Tb4Tm8Co5Pb were obtained from the Materials Project database (MP-ID: mp-3295954, 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_Tb4Tm8Co5Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.21223563
_cell_length_b   8.21223560
_cell_length_c   8.21223605
_cell_angle_alpha   110.56788334
_cell_angle_beta   110.84553325
_cell_angle_gamma   107.02766129
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Tb4Tm8Co5Pb
_chemical_formula_sum   'Tb4 Tm8 Co5 Pb1'
_cell_volume   425.76503013
_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
  Tb  Tb0  1  0.28687302  0.18527849  0.47215052  1.0
  Tb  Tb1  1  0.71312698  0.81472151  0.52784948  1.0
  Tb  Tb2  1  0.28687302  0.81472151  0.10159353  1.0
  Tb  Tb3  1  0.71312698  0.18527849  0.89840647  1.0
  Tm  Tm4  1  0.62010600  0.31258706  0.30751894  1.0
  Tm  Tm5  1  0.37989400  0.68741294  0.69248106  1.0
  Tm  Tm6  1  0.00506812  0.31258706  0.69248106  1.0
  Tm  Tm7  1  0.99493188  0.68741294  0.30751894  1.0
  Tm  Tm8  1  0.21197641  0.40793235  0.19595594  1.0
  Tm  Tm9  1  0.78802359  0.59206765  0.80404406  1.0
  Tm  Tm10  1  0.21197641  0.01602046  0.80404406  1.0
  Tm  Tm11  1  0.78802359  0.98397954  0.19595594  1.0
  Co  Co12  1  0.00000000  0.38039566  0.38039566  1.0
  Co  Co13  1  1.00000000  0.61960434  0.61960434  1.0
  Co  Co14  1  0.38846274  0.88846274  0.50000000  1.0
  Co  Co15  1  0.61153726  0.11153726  0.50000000  1.0
  Co  Co16  1  0.00000000  0.00000000  0.00000000  1.0
  Pb  Pb17  1  0.50000000  0.50000000  0.00000000  1.0
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