SrEu(Sn2Pd)2

High-Entropy Materials HEA

MP-ID: mp-3249569 · Space group: Amm2 (#38)

Materials Project API

Basic Information

Formula

SrEu(Sn2Pd)2

MP-ID

mp-3249569

Elements

Sites

Density

7.7099

g/cm³

Volume

199.71

Å³

Cell a

6.3625

Cell b

6.3625

Cell c

7.5220

α Angle

90.00

β Angle

90.00

γ Angle

139.01

Space Group

Amm2

Point Group

mm2

Crystal System

Orthorhombic

Bravais Lattice

Stability

Yes

Packing Fraction

X-ray Diffraction

Diffraction Pattern

Target / Radiation

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

Diffraction Peaks (Top 24)

2θ	d (Å)	I	hkl
11.77	7.5220	4.4	(0,0,1)
14.86	5.9598	19.8	(1,-1,0)
19.00	4.6713	5.0	(1,-1,1)
24.39	3.6491	2.3	(1,0,1)
28.05	3.1806	3.3	(1,-1,2)
29.99	2.9799	10.6	(2,-2,0)
30.14	2.9652	34.2	(2,-1,0)
32.04	2.7938	100.0	(1,0,2)
32.31	2.7704	50.0	(2,-2,1)
32.46	2.7586	65.0	(2,-1,1)
38.55	2.3356	19.8	(2,-2,2)
38.67	2.3286	48.2	(2,-1,2)
38.97	2.3111	21.0	(1,-1,3)
40.50	2.2275	44.8	(1,1,0)
42.04	2.1492	33.6	(1,0,3)
43.03	2.1019	1.1	(3,-2,0)
43.37	2.0865	2.7	(2,0,0)
45.09	2.0106	1.1	(2,0,1)
45.67	1.9866	1.9	(3,-3,0)
47.38	1.9185	2.5	(2,-2,3)
47.49	1.9146	8.3	(2,-1,3)
48.40	1.8805	11.7	(0,0,4)
49.69	1.8348	1.6	(3,-2,2)
49.99	1.8245	1.4	(2,0,2)

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Energy Properties

Formation Energy/atom

-0.70887

eV/atom

Energy/atom

-25.53040

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-25.5304

eV/atom

Volume/atom

24.96

Å³

c/a Ratio

1.1822

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

6.9409

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.034750

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Sn · 0.500

Element Family

PostTransition-Noble

Solute Fraction

0.500

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.2130

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

10.0849

J/mol·K

Ω Parameter

1.3510

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

13.382%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.4337

smaller = more stable mixing

VEC

5.625

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-7.302

kJ/mol; negative = exothermic mixing

Entropy Norm

0.8750

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaahcxbl

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-3249569

Reference Citation

The crystal structure and related material properties of SrEu(Sn2Pd)2 were obtained from the Materials Project database (MP-ID: mp-3249569, 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_SrEu(Sn2Pd)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.36245557
_cell_length_b   6.36245561
_cell_length_c   7.52197892
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   139.01375972
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrEu(Sn2Pd)2
_chemical_formula_sum   'Sr1 Eu1 Sn4 Pd2'
_cell_volume   199.71217817
_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
  Sr  Sr0  1  0.06398496  0.93601504  0.25000000  1.0
  Eu  Eu1  1  0.93481550  0.06518450  0.75000000  1.0
  Sn  Sn2  1  0.65068468  0.34931532  0.94980662  1.0
  Sn  Sn3  1  0.34988849  0.65011151  0.04679568  1.0
  Sn  Sn4  1  0.34988849  0.65011151  0.45320432  1.0
  Sn  Sn5  1  0.65068468  0.34931532  0.55019338  1.0
  Pd  Pd6  1  0.20710258  0.79289742  0.75000000  1.0
  Pd  Pd7  1  0.79295361  0.20704639  0.25000000  1.0

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