Tm3AlN

High-Entropy Materials HEA Traditional Materials TRA Elasticity Data ELA

MP-ID: mp-1018641 · Space group: Pm-3m (#221)

Materials Project API

Basic Information

Formula

Tm3AlN

MP-ID

mp-1018641

Elements

Sites

Density

9.0043

g/cm³

Volume

101.02

Å³

Cell a

4.6574

Cell b

4.6574

Cell c

4.6574

α Angle

90.00

β Angle

90.00

γ Angle

90.00

Space Group

Pm-3m

Point Group

m-3m

Crystal System

Cubic

Bravais Lattice

Stability

Yes

Packing Fraction

0.5236

X-ray Diffraction

Diffraction Pattern

Target / Radiation

X-axis: 2θ (°); Y-axis: relative intensity; Cu Kα ; λ=1.5418 Å

Diffraction Peaks (Top 16)

2θ	d (Å)	I	hkl
19.06	4.6574	26.8	(1,0,0)
27.08	3.2932	15.0	(1,1,0)
33.32	2.6889	100.0	(1,1,1)
38.67	2.3287	55.5	(2,0,0)
43.45	2.0828	12.8	(2,1,0)
47.84	1.9014	6.9	(2,1,1)
55.83	1.6466	38.1	(2,2,0)
59.55	1.5525	6.2	(2,2,1)
63.13	1.4728	3.1	(3,1,0)
66.60	1.4042	41.6	(3,1,1)
69.98	1.3445	12.9	(2,2,2)
73.28	1.2917	2.7	(3,2,0)
76.54	1.2447	3.6	(3,2,1)
82.92	1.1643	6.2	(4,0,0)
86.08	1.1296	3.6	(3,2,2)
89.22	1.0978	2.0	(3,3,0)

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Energy Properties

Formation Energy/atom

-1.12494

eV/atom

Energy/atom

-25.36973

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-25.3697

eV/atom

Volume/atom

20.20

Å³

c/a Ratio

1.0000

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

0.0000

μB

Mag. Ordering

Unknown

Mag. Sites

Magnetization/Volume

0.000000

μB/Å³

Elastic Properties

K_VRH

96.020

GPa

G_VRH

72.828

GPa

Young's Modulus E

174.393

GPa

Poisson Ratio ν

0.197

Pugh Ratio K/G

1.318

Vickers Hardness Est.

14.783

GPa

Ductility

Ductile

Anisotropy

0.036

Lame λ

47.468

GPa

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Tm · 0.600

Element Family

Lanthanide

Solute Fraction

0.400

Interstitial Fraction

0.200

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.9503

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

7.9005

J/mol·K

Ω Parameter

1.0617

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

26.131%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.6941

smaller = more stable mixing

VEC

9.400

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-9.600

kJ/mol; negative = exothermic mixing

Entropy Norm

0.8650

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.574

Family

Interstitial Alloy

Matrix Element

Tm · 0.600

Elasticity Features

Elastic Modulus Comparison (GPa)

Elastic Features

Elastic Anisotropy A^U

0.0360

Homogeneous Poisson ν

0.1970

Debye Temperature

814.0

Sound Velocity

3,138.8

m/s

Homogeneity

0.1970

Related Tasks

Related computation task IDs (5)

aaadnzca aaadwalw aaaegrkv aaaethey aaafcuix

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-1018641

Reference Citation

The crystal structure and related material properties of Tm3AlN were obtained from the Materials Project database (MP-ID: mp-1018641, 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

3D Crystal Structure Rendering

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Raw CIF Data

# generated using pymatgen
data_Tm3AlN
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.65734774
_cell_length_b   4.65734774
_cell_length_c   4.65734774
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Tm3AlN
_chemical_formula_sum   'Tm3 Al1 N1'
_cell_volume   101.02200807
_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
  Tm  Tm0  1  0.50000000  0.50000000  0.00000000  1.0
  Tm  Tm1  1  0.50000000  -0.00000000  0.50000000  1.0
  Tm  Tm2  1  0.00000000  0.50000000  0.50000000  1.0
  Al  Al3  1  0.00000000  -0.00000000  0.00000000  1.0
  N  N4  1  0.50000000  0.50000000  0.50000000  1.0

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