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AcYbMg2

High-Entropy Materials HEA Traditional Materials TRA Elasticity Data ELA

MP-ID: mp-979950 · Space group: Fm-3m (#225)

Basic Information

Formula
AcYbMg2
MP-ID
mp-979950
Elements
3
Sites
4
Density
6.1249
g/cm³
Volume
121.63
ų
Cell a
5.5615
Å
Cell b
5.5615
Å
Cell c
5.5615
Å
α Angle
60.00
°
β Angle
60.00
°
γ Angle
60.00
°
Space Group
Fm-3m
Point Group
m-3m
Crystal System
Cubic
Bravais Lattice
Cubic F
Stability
No
Packing Fraction
0.7400

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 14)
2θd (Å)Ihkl
19.55 4.5409 2.7 (1,1,1)
22.61 3.9326 70.0 (1,1,0)
32.19 2.7807 100.0 (2,1,1)
37.94 2.3714 1.7 (2,2,1)
39.70 2.2705 22.4 (2,2,2)
46.17 1.9663 18.6 (2,2,0)
52.00 1.7587 31.5 (3,2,1)
57.40 1.6055 39.2 (3,3,2)
67.35 1.3904 12.1 (4,2,2)
72.05 1.3109 15.3 (4,3,3)
76.62 1.2436 16.9 (4,3,1)
81.11 1.1857 9.0 (4,4,2)
85.54 1.1352 4.3 (4,4,4)
89.95 1.0907 7.4 (5,3,2)
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Energy Properties

Formation Energy/atom
-0.04226
eV/atom
Energy/atom
-28.41863
eV/atom
Energy above Hull
0.0375
eV/atom
Uncorrected Energy
-28.4186
eV/atom
Volume/atom
30.41
ų
c/a Ratio
-

Electronic Properties

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

Magnetic Properties

Magnetic
No
Total Mag. Moment
0.0000
μB
Mag. Ordering
NM
Mag. Sites
0
Magnetization/Volume
0.000000
μB/ų

Elastic Properties

KVRH
27.943
GPa
GVRH
16.494
GPa
Young's Modulus E
41.347
GPa
Poisson Ratio ν
0.253
Pugh Ratio K/G
1.694
Vickers Hardness Est.
2.563
GPa
Ductility
Ductile
Anisotropy
1.699
Lame λ
16.947
GPa

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
Mg · 0.500
Element Family
Alkali-AlkEarth
Solute Fraction
0.500
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0397
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.6442
J/mol·K
Ω Parameter
0.0000
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
8.325%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.1050
smaller = more stable mixing
VEC
5.000
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.000
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9464
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.569
Family
Mg-based Alloy
Matrix Element
Mg · 0.500

Elasticity Features

Elastic Modulus Comparison (GPa)
Elastic Features
Elastic Anisotropy AU
1.6990
Homogeneous Poisson ν
0.2530
Debye Temperature
364.5
K
Sound Velocity
1,822.6
m/s
Homogeneity
0.2530

Related Tasks

Related computation task IDs (2)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-979950
Reference Citation

The crystal structure and related material properties of AcYbMg2 were obtained from the Materials Project database (MP-ID: mp-979950, 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_AcYbMg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.56147657
_cell_length_b   5.56147657
_cell_length_c   5.56147657
_cell_angle_alpha   60.00000000
_cell_angle_beta   60.00000000
_cell_angle_gamma   60.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AcYbMg2
_chemical_formula_sum   'Ac1 Yb1 Mg2'
_cell_volume   121.63409796
_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  0.50000000  0.50000000  0.50000000  1.0
  Yb  Yb1  1  0.00000000  0.00000000  0.00000000  1.0
  Mg  Mg2  1  0.25000000  0.25000000  0.25000000  1.0
  Mg  Mg3  1  0.75000000  0.75000000  0.75000000  1.0
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