RbSrMg6

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-1017179 · Space group: Amm2 (#38)

Materials Project API

Basic Information

Formula

RbSrMg6

MP-ID

mp-1017179

Elements

Sites

Density

2.1283

g/cm³

Volume

497.66

Å³

Cell a

5.5626

Cell b

7.1854

Cell c

12.4508

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
14.23	6.2254	4.3	(0,0,2)
14.23	6.2234	41.1	(0,1,1)
21.42	4.1480	23.2	(1,0,2)
21.43	4.1474	21.0	(1,1,1)
24.78	3.5927	9.7	(0,2,0)
28.68	3.1127	15.5	(0,0,4)
28.69	3.1117	19.4	(0,2,2)
29.59	3.0187	23.1	(1,1,3)
32.18	2.7813	34.4	(2,0,0)
32.98	2.7164	42.3	(1,0,4)
32.98	2.7157	100.0	(1,2,2)
35.35	2.5393	9.3	(2,1,1)
38.25	2.3529	6.5	(0,1,5)
38.26	2.3526	3.4	(0,2,4)
38.27	2.3520	5.3	(0,3,1)
41.04	2.1993	5.0	(2,2,0)
41.68	2.1668	4.6	(1,2,4)
41.69	2.1663	1.2	(1,3,1)
43.62	2.0751	1.8	(0,0,6)
43.64	2.0740	9.6	(2,0,4)
43.65	2.0737	11.9	(2,2,2)
46.73	1.9437	6.6	(1,3,3)
50.81	1.7969	17.2	(0,2,6)
50.83	1.7964	8.7	(0,4,0)

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Energy Properties

Formation Energy/atom

0.24693

eV/atom

Energy/atom

-1.31004

eV/atom

Energy above Hull

0.2759

eV/atom

Uncorrected Energy

-1.3100

eV/atom

Volume/atom

31.10

Å³

c/a Ratio

2.2383

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Total Mag. Moment

0.0066

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

0.0000

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

15.135%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.1869

smaller = more stable mixing

VEC

1.875

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

0.000

kJ/mol; negative = exothermic mixing

Entropy Norm

0.6696

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.565

Family

Mg-based Alloy

Matrix Element

Mg · 0.750

Related Tasks

Related computation task IDs (1)

aaacfwuj

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-1017179

Reference Citation

The crystal structure and related material properties of RbSrMg6 were obtained from the Materials Project database (MP-ID: mp-1017179, 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_RbSrMg6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.56262100
_cell_length_b   7.18540800
_cell_length_c   12.45083400
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbSrMg6
_chemical_formula_sum   'Rb2 Sr2 Mg12'
_cell_volume   497.65611759
_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  0.00000000  0.50000000  0.34136800  1.0
  Rb  Rb1  1  0.00000000  0.00000000  0.84136800  1.0
  Sr  Sr2  1  0.50000000  0.50000000  0.15910500  1.0
  Sr  Sr3  1  0.50000000  0.00000000  0.65910500  1.0
  Mg  Mg4  1  0.00000000  0.24037000  0.08225700  1.0
  Mg  Mg5  1  0.00000000  0.75963000  0.08225700  1.0
  Mg  Mg6  1  0.00000000  0.00000000  0.33273000  1.0
  Mg  Mg7  1  0.50000000  0.77061600  0.41831000  1.0
  Mg  Mg8  1  0.50000000  0.22938400  0.41831000  1.0
  Mg  Mg9  1  0.50000000  0.00000000  0.16566200  1.0
  Mg  Mg10  1  0.00000000  0.74037000  0.58225700  1.0
  Mg  Mg11  1  0.00000000  0.25963000  0.58225700  1.0
  Mg  Mg12  1  0.00000000  0.50000000  0.83273000  1.0
  Mg  Mg13  1  0.50000000  0.27061600  0.91831000  1.0
  Mg  Mg14  1  0.50000000  0.72938400  0.91831000  1.0
  Mg  Mg15  1  0.50000000  0.50000000  0.66566200  1.0

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