RbNaMg6

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-1017345 · Space group: Amm2 (#38)

Materials Project API

Basic Information

Formula

RbNaMg6

MP-ID

mp-1017345

Elements

Sites

Density

1.8018

g/cm³

Volume

468.70

Å³

Cell a

5.4364

Cell b

7.1560

Cell c

12.0481

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
14.40	6.1526	19.3	(0,1,1)
14.71	6.0240	10.3	(0,0,2)
16.31	5.4364	11.3	(1,0,0)
21.82	4.0739	29.9	(1,1,1)
22.02	4.0359	13.6	(1,0,2)
24.89	3.5780	4.4	(0,2,0)
25.43	3.5022	9.2	(0,1,3)
29.03	3.0763	34.4	(0,2,2)
29.66	3.0120	10.4	(0,0,4)
29.90	2.9888	4.8	(1,2,0)
30.36	2.9442	8.7	(1,1,3)
32.95	2.7182	37.3	(2,0,0)
33.47	2.6774	100.0	(1,2,2)
34.03	2.6347	56.5	(1,0,4)
36.13	2.4863	4.4	(2,1,1)
36.26	2.4776	2.3	(2,0,2)
38.47	2.3399	4.5	(0,3,1)
39.09	2.3043	3.5	(0,2,4)
39.46	2.2836	3.8	(0,1,5)
41.73	2.1644	2.2	(2,2,0)
42.04	2.1493	2.6	(1,3,1)
42.08	2.1473	4.7	(2,1,3)
42.62	2.1216	2.5	(1,2,4)
42.96	2.1054	2.3	(1,1,5)

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Energy Properties

Formation Energy/atom

0.25934

eV/atom

Energy/atom

-1.25380

eV/atom

Energy above Hull

0.2593

eV/atom

Uncorrected Energy

-1.2538

eV/atom

Volume/atom

29.29

Å³

c/a Ratio

2.2162

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Total Mag. Moment

0.0036

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.000010

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

Mg · 0.750

Element Family

Alkali-AlkEarth

Solute Fraction

0.250

Interstitial Fraction

0.000

High-Entropy Alloy Features

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

3.9316

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

14.520%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.1904

smaller = more stable mixing

VEC

1.750

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-1.210

kJ/mol; negative = exothermic mixing

Entropy Norm

0.6696

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.576

Family

Mg-based Alloy

Matrix Element

Mg · 0.750

Related Tasks

Related computation task IDs (1)

aaacfwzr

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-1017345

Reference Citation

The crystal structure and related material properties of RbNaMg6 were obtained from the Materials Project database (MP-ID: mp-1017345, 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_RbNaMg6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.43635700
_cell_length_b   7.15601300
_cell_length_c   12.04807600
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbNaMg6
_chemical_formula_sum   'Rb2 Na2 Mg12'
_cell_volume   468.70197976
_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
  Rb  Rb0  1  0.50000000  0.50000000  0.17288500  1.0
  Rb  Rb1  1  0.50000000  0.00000000  0.67288500  1.0
  Na  Na2  1  0.00000000  0.50000000  0.34062600  1.0
  Na  Na3  1  0.00000000  0.00000000  0.84062600  1.0
  Mg  Mg4  1  0.00000000  0.22099200  0.07284300  1.0
  Mg  Mg5  1  0.00000000  0.77900800  0.07284300  1.0
  Mg  Mg6  1  0.00000000  0.50000000  0.83271900  1.0
  Mg  Mg7  1  0.50000000  0.26075900  0.92273300  1.0
  Mg  Mg8  1  0.50000000  0.73924100  0.92273300  1.0
  Mg  Mg9  1  0.50000000  0.50000000  0.66261900  1.0
  Mg  Mg10  1  0.00000000  0.72099200  0.57284300  1.0
  Mg  Mg11  1  0.00000000  0.27900800  0.57284300  1.0
  Mg  Mg12  1  0.00000000  0.00000000  0.33271900  1.0
  Mg  Mg13  1  0.50000000  0.76075900  0.42273300  1.0
  Mg  Mg14  1  0.50000000  0.23924100  0.42273300  1.0
  Mg  Mg15  1  0.50000000  0.00000000  0.16261900  1.0

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