Eu3Ho(Al3Pt)6

High-Entropy Materials HEA

MP-ID: mp-3296278 · Space group: Pm (#6)

Materials Project API

Basic Information

Formula

Eu3Ho(Al3Pt)6

MP-ID

mp-3296278

Elements

Sites

Density

7.9162

g/cm³

Volume

477.63

Å³

Cell a

7.6024

Cell b

7.6048

Cell c

9.5071

α Angle

90.00

β Angle

90.00

γ Angle

119.66

Space Group

Point Group

Crystal System

Monoclinic

Bravais Lattice

Stability

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
13.40	6.6084	4.0	(0,1,-1,0)
13.40	6.6063	2.7	(1,0,-1,0)
13.47	6.5737	10.3	(1,-1,0,0)
16.34	5.4263	9.1	(0,1,-1,1)
16.34	5.4251	10.3	(1,0,-1,1)
18.67	4.7535	32.2	(0,0,0,2)
23.05	3.8589	1.4	(0,1,-1,2)
23.05	3.8585	1.3	(1,0,-1,2)
23.09	3.8520	4.0	(1,-1,0,2)
23.28	3.8213	31.6	(1,1,-2,0)
23.40	3.8023	31.7	(1,-2,1,0)
23.40	3.8012	31.3	(2,-1,-1,0)
25.12	3.5456	17.9	(1,1,-2,1)
25.23	3.5305	18.8	(1,-2,1,1)
25.23	3.5295	18.6	(2,-1,-1,1)
27.13	3.2868	4.2	(2,-2,0,0)
28.60	3.1211	5.1	(0,2,-2,1)
28.61	3.1202	5.1	(2,0,-2,1)
30.00	2.9783	100.0	(1,1,-2,2)
30.10	2.9693	98.1	(1,-2,1,2)
30.10	2.9687	99.1	(2,-1,-1,2)
31.30	2.8575	2.6	(0,1,-1,3)
31.31	2.8573	2.8	(1,0,-1,3)
33.02	2.7131	2.4	(0,2,-2,2)

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Energy Properties

Formation Energy/atom

-0.79046

eV/atom

Energy/atom

-21.45289

eV/atom

Energy above Hull

0.0559

eV/atom

Uncorrected Energy

-21.4529

eV/atom

Volume/atom

17.06

Å³

c/a Ratio

1.2505

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

1.2829

μB

Mag. Ordering

FiM

Mag. Sites

Magnetization/Volume

0.002690

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Al · 0.643

Element Family

PostTransition-Noble

Solute Fraction

0.357

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.9725

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

8.0850

J/mol·K

Ω Parameter

0.3969

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

9.714%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.3346

smaller = more stable mixing

VEC

5.214

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-24.796

kJ/mol; negative = exothermic mixing

Entropy Norm

0.7015

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaahfody

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-3296278

Reference Citation

The crystal structure and related material properties of Eu3Ho(Al3Pt)6 were obtained from the Materials Project database (MP-ID: mp-3296278, 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

Loading 3D structure…

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Raw CIF Data

# generated using pymatgen
data_Eu3Ho(Al3Pt)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.60242826
_cell_length_b   7.60482091
_cell_length_c   9.50707607
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   119.66078147
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Eu3Ho(Al3Pt)6
_chemical_formula_sum   'Eu3 Ho1 Al18 Pt6'
_cell_volume   477.63187101
_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
  Eu  Eu0  1  0.00530353  0.33167433  0.75000000  1.0
  Eu  Eu1  1  0.99608077  0.66930346  0.25000000  1.0
  Eu  Eu2  1  0.32959784  0.00415575  0.75000000  1.0
  Ho  Ho3  1  0.66989605  0.99619333  0.25000000  1.0
  Al  Al4  1  0.66554009  0.99894098  0.92585106  1.0
  Al  Al5  1  0.12906288  0.13133135  0.25000000  1.0
  Al  Al6  1  0.00093686  0.33407780  0.42399177  1.0
  Al  Al7  1  0.33427073  0.33424042  0.55383830  1.0
  Al  Al8  1  0.34346892  0.54681747  0.25000000  1.0
  Al  Al9  1  0.45633844  0.65975281  0.75000000  1.0
  Al  Al10  1  0.86758903  0.86819700  0.75000000  1.0
  Al  Al11  1  0.66624241  0.66667698  0.05790380  1.0
  Al  Al12  1  0.66624241  0.66667698  0.44209620  1.0
  Al  Al13  1  0.99815381  0.66547925  0.57390295  1.0
  Al  Al14  1  0.99815381  0.66547925  0.92609705  1.0
  Al  Al15  1  0.33490100  0.00119481  0.42402814  1.0
  Al  Al16  1  0.65919141  0.45429223  0.75000000  1.0
  Al  Al17  1  0.54401964  0.33686804  0.25000000  1.0
  Al  Al18  1  0.33427073  0.33424042  0.94616170  1.0
  Al  Al19  1  0.33490100  0.00119481  0.07597186  1.0
  Al  Al20  1  0.66554009  0.99894098  0.57414894  1.0
  Al  Al21  1  0.00093686  0.33407780  0.07600823  1.0
  Pt  Pt22  1  0.33140024  0.67229226  0.49816400  1.0
  Pt  Pt23  1  0.33140024  0.67229226  0.00183600  1.0
  Pt  Pt24  1  0.67063510  0.32833345  0.49806231  1.0
  Pt  Pt25  1  0.99764551  0.99947268  0.00212107  1.0
  Pt  Pt26  1  0.99764551  0.99947268  0.49787893  1.0
  Pt  Pt27  1  0.67063510  0.32833345  0.00193769  1.0

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