Mg6NbCr

高熵材料 HEA 传统材料 TRA

MP-ID: mp-1016632 · Space group: Amm2 (#38)

Materials Project API

Basic Information

Formula

Mg6NbCr

MP-ID

mp-1016632

Elements

Sites

Density

2.9730

g/cm³

Volume

324.78

Å³

Cell a

4.8297

Cell b

6.0662

Cell c

11.0854

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
15.99	5.5427	33.6	(0,0,2)
16.66	5.3215	78.0	(0,1,1)
18.37	4.8297	5.3	(1,0,0)
24.45	3.6413	13.1	(1,0,2)
24.90	3.5764	12.3	(1,1,1)
28.28	3.1558	10.9	(0,1,3)
29.45	3.0331	9.7	(0,2,0)
32.30	2.7714	3.0	(0,0,4)
33.68	2.6608	54.0	(0,2,2)
33.93	2.6418	19.4	(1,1,3)
34.93	2.5686	2.1	(1,2,0)
37.23	2.4148	48.2	(2,0,0)
37.41	2.4037	86.7	(1,0,4)
38.63	2.3305	100.0	(1,2,2)
40.76	2.2139	6.1	(2,0,2)
41.05	2.1990	15.1	(2,1,1)
43.46	2.0824	1.2	(0,1,5)
44.27	2.0459	1.7	(0,2,4)
45.60	1.9892	4.3	(0,3,1)
47.40	1.9178	5.1	(2,1,3)
47.55	1.9122	14.2	(1,1,5)
48.17	1.8892	4.6	(2,2,0)
48.31	1.8839	9.7	(1,2,4)
49.56	1.8393	3.3	(1,3,1)

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Energy Properties

Formation Energy/atom

0.25932

eV/atom

Energy/atom

-3.43282

eV/atom

Energy above Hull

0.2649

eV/atom

Uncorrected Energy

-3.4328

eV/atom

Volume/atom

20.30

Å³

c/a Ratio

2.2953

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

5.0031

μB

Mag. Ordering

FiM

Mag. Sites

Magnetization/Volume

0.015400

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

1.4070

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

7.085%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.1394

smaller = more stable mixing

VEC

2.875

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-5.688

kJ/mol; negative = exothermic mixing

Entropy Norm

0.6696

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaacfwbe

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-1016632

Reference Citation

The crystal structure and related material properties of Mg6NbCr were obtained from the Materials Project database (MP-ID: mp-1016632, 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

Loading 3D structure…

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Raw CIF Data

# generated using pymatgen
data_Mg6NbCr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.82968200
_cell_length_b   6.06616500
_cell_length_c   11.08539000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Mg6NbCr
_chemical_formula_sum   'Mg12 Nb2 Cr2'
_cell_volume   324.77585316
_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
  Mg  Mg0  1  0.00000000  0.25694800  0.07672200  1.0
  Mg  Mg1  1  0.00000000  0.74305200  0.07672200  1.0
  Mg  Mg2  1  0.00000000  0.00000000  0.33189600  1.0
  Mg  Mg3  1  0.50000000  0.73989800  0.42025200  1.0
  Mg  Mg4  1  0.50000000  0.26010200  0.42025200  1.0
  Mg  Mg5  1  0.50000000  0.00000000  0.17202900  1.0
  Mg  Mg6  1  0.00000000  0.75694800  0.57672200  1.0
  Mg  Mg7  1  0.00000000  0.24305200  0.57672200  1.0
  Mg  Mg8  1  0.00000000  0.50000000  0.83189600  1.0
  Mg  Mg9  1  0.50000000  0.23989800  0.92025200  1.0
  Mg  Mg10  1  0.50000000  0.76010200  0.92025200  1.0
  Mg  Mg11  1  0.50000000  0.50000000  0.67202900  1.0
  Nb  Nb12  1  0.00000000  0.50000000  0.30921600  1.0
  Nb  Nb13  1  0.00000000  0.00000000  0.80921600  1.0
  Cr  Cr14  1  0.50000000  0.50000000  0.19291100  1.0
  Cr  Cr15  1  0.50000000  0.00000000  0.69291100  1.0

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