YMg6CoO8

High-Entropy Materials HEA

MP-ID: mp-1032787 · Space group: P4/mmm (#123)

Materials Project API

Basic Information

Formula

YMg6CoO8

MP-ID

mp-1032787

Elements

Sites

Density

4.0682

g/cm³

Volume

172.11

Å³

Cell a

8.9148

Cell b

4.3939

Cell c

4.3939

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

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
9.92	8.9148	1.3	(1,0,0)
19.92	4.4574	19.9	(2,0,0)
20.21	4.3939	35.2	(0,1,0)
22.56	3.9412	4.3	(1,1,0)
28.53	3.1292	29.9	(2,1,0)
28.73	3.1070	14.7	(0,1,1)
30.07	2.9716	3.2	(3,0,0)
30.47	2.9339	4.7	(1,1,1)
35.21	2.5489	47.3	(2,1,1)
36.50	2.4615	1.2	(3,1,0)
40.47	2.2287	48.2	(4,0,0)
41.09	2.1970	100.0	(0,2,0)
45.64	1.9876	7.9	(4,1,0)
46.06	1.9706	8.4	(2,2,0)
46.20	1.9650	7.6	(0,2,1)
47.37	1.9190	1.2	(1,2,1)
50.39	1.8110	8.0	(4,1,1)
50.78	1.7981	11.4	(2,2,1)
51.75	1.7666	2.8	(3,2,0)
59.04	1.5646	55.2	(4,2,0)
59.50	1.5535	29.3	(0,2,2)
59.80	1.5464	3.4	(5,1,1)
62.51	1.4858	1.4	(6,0,0)
63.07	1.4739	5.7	(4,2,1)

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Energy Properties

Formation Energy/atom

-2.74887

eV/atom

Energy/atom

-6.68694

eV/atom

Energy above Hull

0.2271

eV/atom

Uncorrected Energy

-6.2411

eV/atom

Volume/atom

10.76

Å³

c/a Ratio

0.4929

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

2.1109

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.012260

μB/Å³

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

1.0788

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

45.909%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

1.0441

smaller = more stable mixing

VEC

3.500

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-4.877

kJ/mol; negative = exothermic mixing

Entropy Norm

0.7653

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (2)

aaacgtup aaacgtyz

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-1032787

Reference Citation

The crystal structure and related material properties of YMg6CoO8 were obtained from the Materials Project database (MP-ID: mp-1032787, 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_YMg6CoO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.91479079
_cell_length_b   4.39392127
_cell_length_c   4.39392127
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   YMg6CoO8
_chemical_formula_sum   'Y1 Mg6 Co1 O8'
_cell_volume   172.11380177
_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
  Y  Y0  1  0.00000000  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  0.27368009  0.00000000  0.50000000  1.0
  Mg  Mg4  1  0.72631991  0.00000000  0.50000000  1.0
  Mg  Mg5  1  0.27368009  0.50000000  0.00000000  1.0
  Mg  Mg6  1  0.72631991  0.50000000  0.00000000  1.0
  Co  Co7  1  0.50000000  0.00000000  0.00000000  1.0
  O  O8  1  0.24907149  0.00000000  0.00000000  1.0
  O  O9  1  0.75092851  0.00000000  0.00000000  1.0
  O  O10  1  0.24910041  0.50000000  0.50000000  1.0
  O  O11  1  0.75089959  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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