KMg6Cr

高熵材料 HEA 传统材料 TRA

MP-ID: mp-1021307 · Space group: Amm2 (#38)

Materials Project API

Basic Information

Formula

KMg6Cr

MP-ID

mp-1021307

Elements

Sites

Density

1.9424

g/cm³

Volume

405.09

Å³

Cell a

5.2708

Cell b

6.7134

Cell c

11.4483

α Angle

90.00

β Angle

90.00

γ Angle

90.00

Space Group

Amm2

Point Group

mm2

Crystal System

Orthorhombic

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
15.30	5.7911	4.3	(0,1,1)
15.48	5.7241	7.6	(0,0,2)
16.82	5.2708	6.9	(1,0,0)
22.94	3.8774	7.3	(1,0,2)
26.56	3.3567	2.5	(0,2,0)
30.88	2.8955	25.8	(0,2,2)
31.25	2.8621	13.4	(0,0,4)
31.60	2.8313	2.5	(1,2,0)
34.02	2.6354	37.2	(2,0,0)
35.37	2.5378	100.0	(1,2,2)
35.70	2.5152	48.0	(1,0,4)
37.57	2.3939	1.5	(2,0,2)
41.46	2.1779	1.4	(0,2,4)
43.67	2.0729	1.1	(2,2,0)
44.70	2.0273	1.0	(1,3,1)
45.04	2.0128	1.4	(1,2,4)
45.24	2.0043	1.0	(1,1,5)
46.60	1.9490	15.2	(2,2,2)
46.86	1.9387	8.0	(2,0,4)
54.67	1.6788	1.1	(2,2,4)
54.69	1.6783	8.1	(0,4,0)
55.39	1.6588	16.2	(0,2,6)
61.76	1.5021	17.6	(3,2,2)
61.98	1.4973	8.6	(3,0,4)

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Energy Properties

Formation Energy/atom

0.37690

eV/atom

Energy/atom

-2.19400

eV/atom

Energy above Hull

0.3769

eV/atom

Uncorrected Energy

-2.1940

eV/atom

Volume/atom

25.32

Å³

c/a Ratio

2.1720

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

8.8976

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.021960

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Mg · 0.750

Element Family

Alkali-AlkEarth

Solute Fraction

0.250

Interstitial Fraction

0.000

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.7356

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

6.1160

J/mol·K

Ω Parameter

1.5982

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

14.548%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.2122

smaller = more stable mixing

VEC

2.375

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-3.853

kJ/mol; negative = exothermic mixing

Entropy Norm

0.6696

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaacgdfl

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-1021307

Reference Citation

The crystal structure and related material properties of KMg6Cr were obtained from the Materials Project database (MP-ID: mp-1021307, 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_KMg6Cr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.27080000
_cell_length_b   6.71335200
_cell_length_c   11.44825000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KMg6Cr
_chemical_formula_sum   'K2 Mg12 Cr2'
_cell_volume   405.09330072
_cell_formula_units_Z   2
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
  K  K0  1  0.00000000  0.00000000  0.83488400  1.0
  K  K1  1  0.00000000  0.50000000  0.33488400  1.0
  Mg  Mg2  1  0.00000000  0.24749700  0.58297700  1.0
  Mg  Mg3  1  0.00000000  0.75250300  0.58297700  1.0
  Mg  Mg4  1  0.50000000  0.22730000  0.41819400  1.0
  Mg  Mg5  1  0.50000000  0.77270000  0.41819400  1.0
  Mg  Mg6  1  0.50000000  0.00000000  0.65703800  1.0
  Mg  Mg7  1  0.50000000  0.00000000  0.17138600  1.0
  Mg  Mg8  1  0.00000000  0.74749700  0.08297700  1.0
  Mg  Mg9  1  0.00000000  0.25250300  0.08297700  1.0
  Mg  Mg10  1  0.50000000  0.72730000  0.91819400  1.0
  Mg  Mg11  1  0.50000000  0.27270000  0.91819400  1.0
  Mg  Mg12  1  0.50000000  0.50000000  0.15703800  1.0
  Mg  Mg13  1  0.50000000  0.50000000  0.67138600  1.0
  Cr  Cr14  1  0.00000000  0.00000000  0.33435300  1.0
  Cr  Cr15  1  0.00000000  0.50000000  0.83435300  1.0

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