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Tm(Fe2Si)2

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-1104799 · Space group: P4_2/mnm (#136)

Basic Information

Formula
Tm(Fe2Si)2
MP-ID
mp-1104799
Elements
3
Sites
14
Density
7.9890
g/cm³
Volume
186.44
ų
Cell a
7.0401
Å
Cell b
7.0401
Å
Cell c
3.7616
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
90.00
°
Space Group
P4_2/mnm
Point Group
4/mmm
Crystal System
Tetragonal
Bravais Lattice
Tetragonal P
Stability
No
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
17.82 4.9781 5.2 (1,1,0)
25.30 3.5201 21.9 (2,0,0)
26.87 3.3177 32.4 (1,0,1)
29.77 3.0012 2.8 (1,1,1)
36.09 2.4891 16.5 (2,2,0)
37.24 2.4143 100.0 (2,1,1)
40.52 2.2263 46.6 (3,1,0)
43.60 2.0758 23.7 (2,2,1)
45.56 1.9910 4.7 (3,0,1)
46.51 1.9526 1.5 (3,2,0)
47.45 1.9159 22.1 (3,1,1)
48.40 1.8808 21.3 (0,0,2)
52.83 1.7330 5.1 (3,2,1)
53.68 1.7075 6.3 (4,1,0)
55.37 1.6594 4.2 (3,3,0)
55.39 1.6589 5.4 (2,0,2)
58.64 1.5742 2.6 (4,2,0)
59.45 1.5548 18.8 (4,1,1)
61.83 1.5006 7.0 (2,2,2)
64.90 1.4367 22.3 (3,1,2)
67.89 1.3807 9.1 (5,1,0)
71.55 1.3187 21.0 (4,3,1)
72.27 1.3073 2.9 (5,2,0)
75.15 1.2642 4.3 (4,1,2)
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Energy Properties

Formation Energy/atom
-0.45250
eV/atom
Energy/atom
-7.48296
eV/atom
Energy above Hull
0.0118
eV/atom
Uncorrected Energy
-7.5033
eV/atom
Volume/atom
13.32
ų
c/a Ratio
0.5343

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
7.6886
μB
Mag. Ordering
FiM
Mag. Sites
10
Magnetization/Volume
0.041240
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Fe · 0.571
Element Family
3d-TM
Solute Fraction
0.429
Interstitial Fraction
0.286

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.9557
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
7.9457
J/mol·K
Ω Parameter
0.6176
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
14.272%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.2133
smaller = more stable mixing
VEC
7.571
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-22.857
kJ/mol; negative = exothermic mixing
Entropy Norm
0.8699
SS Former
0
Phase Tendency
AM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
A
Score
0.693
Family
Fe-rich Alloy
Matrix Element
Fe · 0.571

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1104799
Reference Citation

The crystal structure and related material properties of Tm(Fe2Si)2 were obtained from the Materials Project database (MP-ID: mp-1104799, 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_Tm(Fe2Si)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.04011700
_cell_length_b   7.04011700
_cell_length_c   3.76160100
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Tm(Fe2Si)2
_chemical_formula_sum   'Tm2 Fe8 Si4'
_cell_volume   186.43716088
_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
  Tm  Tm0  1  0.50000000  0.50000000  0.50000000  1.0
  Tm  Tm1  1  0.00000000  0.00000000  0.00000000  1.0
  Fe  Fe2  1  0.64723000  0.91384300  0.50000000  1.0
  Fe  Fe3  1  0.35277000  0.08615700  0.50000000  1.0
  Fe  Fe4  1  0.14723000  0.58615700  0.00000000  1.0
  Fe  Fe5  1  0.85277000  0.41384300  0.00000000  1.0
  Fe  Fe6  1  0.91384300  0.64723000  0.50000000  1.0
  Fe  Fe7  1  0.08615700  0.35277000  0.50000000  1.0
  Fe  Fe8  1  0.58615700  0.14723000  0.00000000  1.0
  Fe  Fe9  1  0.41384300  0.85277000  0.00000000  1.0
  Si  Si10  1  0.78074700  0.21925300  0.50000000  1.0
  Si  Si11  1  0.21925300  0.78074700  0.50000000  1.0
  Si  Si12  1  0.28074700  0.28074700  0.00000000  1.0
  Si  Si13  1  0.71925300  0.71925300  0.00000000  1.0
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