AcEuCd4

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-3249462 · Space group: Imm2 (#44)

Materials Project API

Basic Information

Formula

AcEuCd4

MP-ID

mp-3249462

Elements

Sites

Density

7.9944

g/cm³

Volume

172.11

Å³

Cell a

5.0820

Cell b

6.3573

Cell c

6.3573

α Angle

95.65

β Angle

113.56

γ Angle

66.44

Space Group

Imm2

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
15.25	5.8118	4.7	(0,1,0)
20.34	4.3668	7.2	(1,1,0)
20.76	4.2795	1.5	(1,0,0)
20.81	4.2683	2.8	(0,1,1)
29.56	3.0221	31.4	(1,1,1)
30.44	2.9364	100.0	(1,0,1)
30.77	2.9059	42.4	(0,2,0)
33.45	2.6785	7.4	(0,2,1)
35.32	2.5410	38.4	(2,1,-1)
35.53	2.5264	18.4	(0,2,-1)
36.18	2.4828	57.6	(1,2,1)
41.35	2.1834	1.1	(2,2,0)
42.97	2.1047	1.7	(1,1,2)
44.04	2.0560	2.9	(1,0,2)
45.74	1.9837	7.2	(0,2,-2)
46.90	1.9373	3.2	(0,3,0)
47.53	1.9128	25.4	(2,1,1)
47.61	1.9098	3.2	(1,2,2)
48.43	1.8795	8.0	(0,3,1)
49.44	1.8435	5.0	(2,2,1)
50.54	1.8060	3.5	(1,-1,2)
50.54	1.8060	3.5	(1,3,-2)
50.75	1.7989	3.0	(0,3,-1)
50.97	1.7916	6.4	(2,0,1)

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Energy Properties

Formation Energy/atom

-0.38673

eV/atom

Energy/atom

-31.64978

eV/atom

Energy above Hull

0.0000

eV/atom

Uncorrected Energy

-31.6498

eV/atom

Volume/atom

28.69

Å³

c/a Ratio

1.2509

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

7.7461

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.045010

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Cd · 0.667

Element Family

4d-TM

Solute Fraction

0.333

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.8676

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

7.2129

J/mol·K

Ω Parameter

0.0000

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

11.348%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.2562

smaller = more stable mixing

VEC

9.500

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

0.000

kJ/mol; negative = exothermic mixing

Entropy Norm

0.7897

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.546

Family

Cd-rich Multi-Component

Matrix Element

Cd · 0.667

Related Tasks

Related computation task IDs (1)

aaahcwxi

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-3249462

Reference Citation

The crystal structure and related material properties of AcEuCd4 were obtained from the Materials Project database (MP-ID: mp-3249462, 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_AcEuCd4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.08198428
_cell_length_b   6.35725209
_cell_length_c   6.35725209
_cell_angle_alpha   95.64822723
_cell_angle_beta   113.55940877
_cell_angle_gamma   66.44059077
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AcEuCd4
_chemical_formula_sum   'Ac1 Eu1 Cd4'
_cell_volume   172.11362774
_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
  Ac  Ac0  1  0.25000000  0.70973952  0.20973952  1.0
  Eu  Eu1  1  0.75000000  0.28303287  0.78303287  1.0
  Cd  Cd2  1  0.55203085  0.11540640  0.21946610  1.0
  Cd  Cd3  1  0.04761041  0.28856766  0.38378747  1.0
  Cd  Cd4  1  0.94797015  0.71946610  0.61540540  1.0
  Cd  Cd5  1  0.45238959  0.88378747  0.78856666  1.0

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