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CsMg6AlO8

High-Entropy Materials HEA

MP-ID: mp-1033065 · Space group: P4/mmm (#123)

Basic Information

Formula
CsMg6AlO8
MP-ID
mp-1033065
Elements
4
Sites
16
Density
3.7213
g/cm³
Volume
193.54
ų
Cell a
8.5670
Å
Cell b
4.7530
Å
Cell c
4.7530
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
90.00
°
Space Group
P4/mmm
Point Group
4/mmm
Crystal System
Tetragonal
Bravais Lattice
Tetragonal P
Stability
No
Packing Fraction
0.6800

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
10.33 8.5670 41.2 (1,0,0)
18.67 4.7530 34.2 (0,1,0)
20.74 4.2835 15.3 (2,0,0)
21.38 4.1562 37.3 (1,1,0)
26.52 3.3609 14.7 (0,1,1)
28.04 3.1820 28.9 (2,1,0)
28.53 3.1287 19.1 (1,1,1)
31.32 2.8557 8.5 (3,0,0)
33.90 2.6441 46.7 (2,1,1)
36.71 2.4478 18.1 (3,1,0)
37.86 2.3765 100.0 (0,2,0)
39.35 2.2900 7.3 (1,2,0)
41.50 2.1762 11.8 (3,1,1)
42.19 2.1418 32.1 (4,0,0)
42.53 2.1256 8.1 (0,2,1)
43.55 2.0781 8.4 (2,2,0)
43.89 2.0631 11.7 (1,2,1)
46.51 1.9527 4.0 (4,1,0)
47.77 1.9041 12.8 (2,2,1)
49.93 1.8267 8.5 (3,2,0)
50.53 1.8062 3.2 (4,1,1)
53.76 1.7051 11.3 (3,2,1)
54.61 1.6804 30.9 (0,2,2)
55.74 1.6490 2.7 (1,2,2)
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Energy Properties

Formation Energy/atom
-2.34600
eV/atom
Energy/atom
-5.72225
eV/atom
Energy above Hull
0.6444
eV/atom
Uncorrected Energy
-5.3788
eV/atom
Volume/atom
12.10
ų
c/a Ratio
0.5548

Electronic Properties

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

Magnetic Properties

Magnetic
No
Total Mag. Moment
0.1328
μB
Mag. Ordering
NM
Mag. Sites
0
Magnetization/Volume
0.000690
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.500
Element Family
Metalloid-Nonmetal
Solute Fraction
0.500
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0610
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.8208
J/mol·K
Ω Parameter
7.0679
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
52.341%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
1.0890
smaller = more stable mixing
VEC
3.000
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-0.563
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7653
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (2)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1033065
Reference Citation

The crystal structure and related material properties of CsMg6AlO8 were obtained from the Materials Project database (MP-ID: mp-1033065, 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_CsMg6AlO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.56699222
_cell_length_b   4.75299059
_cell_length_c   4.75299059
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CsMg6AlO8
_chemical_formula_sum   'Cs1 Mg6 Al1 O8'
_cell_volume   193.53623202
_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
  Cs  Cs0  1  0.50000000  -0.00000000  -0.00000000  1.0
  Mg  Mg1  1  0.00000000  0.50000000  0.50000000  1.0
  Mg  Mg2  1  0.50000000  0.50000000  0.50000000  1.0
  Mg  Mg3  1  0.24598851  0.00000000  0.50000000  1.0
  Mg  Mg4  1  0.75401149  -0.00000000  0.50000000  1.0
  Mg  Mg5  1  0.24598851  0.50000000  -0.00000000  1.0
  Mg  Mg6  1  0.75401149  0.50000000  0.00000000  1.0
  Al  Al7  1  0.00000000  -0.00000000  -0.00000000  1.0
  O  O8  1  0.19955854  -0.00000000  -0.00000000  1.0
  O  O9  1  0.80044146  0.00000000  0.00000000  1.0
  O  O10  1  0.24674330  0.50000000  0.50000000  1.0
  O  O11  1  0.75325670  0.50000000  0.50000000  1.0
  O  O12  1  0.00000000  -0.00000000  0.50000000  1.0
  O  O13  1  0.50000000  -0.00000000  0.50000000  1.0
  O  O14  1  0.00000000  0.50000000  -0.00000000  1.0
  O  O15  1  0.50000000  0.50000000  -0.00000000  1.0
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