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Sr2Ti2AlGaO7

High-Entropy Materials HEA

MP-ID: mp-1048054 · Space group: P1 (#1)

Basic Information

Formula
Sr2Ti2AlGaO7
MP-ID
mp-1048054
Elements
5
Sites
26
Density
4.4012
g/cm³
Volume
361.96
ų
Cell a
5.1608
Å
Cell b
5.3340
Å
Cell c
13.6245
Å
α Angle
100.51
°
β Angle
100.79
°
γ Angle
90.25
°
Space Group
P1
Point Group
1
Crystal System
Triclinic
Bravais Lattice
Triclinic P
Stability
No
Packing Fraction
0.5240

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
6.72 13.1490 52.5 (0,0,1)
13.47 6.5745 2.1 (0,0,2)
16.92 5.2404 2.6 (0,1,0)
17.01 5.2138 3.0 (0,1,-1)
17.51 5.0656 2.7 (1,0,0)
17.52 5.0627 2.9 (1,0,-1)
19.37 4.5830 6.1 (0,1,1)
19.60 4.5302 6.4 (0,1,-2)
19.95 4.4502 2.4 (1,0,1)
19.98 4.4444 1.9 (1,0,-2)
20.26 4.3830 8.3 (0,0,3)
23.60 3.7696 8.5 (0,1,2)
23.92 3.7208 6.2 (0,1,-3)
23.94 3.7168 2.2 (1,-1,0)
24.05 3.7008 3.6 (1,1,-1)
24.14 3.6864 6.3 (1,0,2)
24.18 3.6809 5.2 (1,0,-3)
24.84 3.5842 6.0 (1,-1,-1)
24.93 3.5718 4.6 (1,1,0)
24.95 3.5691 5.7 (1,-1,1)
25.06 3.5531 5.6 (1,1,-2)
27.13 3.2873 10.5 (0,0,4)
27.47 3.2467 29.5 (1,-1,-2)
27.54 3.2390 32.5 (1,1,1)
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Energy Properties

Formation Energy/atom
-2.81976
eV/atom
Energy/atom
-7.48016
eV/atom
Energy above Hull
0.3990
eV/atom
Uncorrected Energy
-7.1102
eV/atom
Volume/atom
13.92
ų
c/a Ratio
-

Electronic Properties

Metallic
Metal
Band Gap
0
eV
Direct Gap
No
CBM
N/A
eV

Magnetic Properties

Magnetic
No
Total Mag. Moment
0.1140
μB
Mag. Ordering
NM
Mag. Sites
0
Magnetization/Volume
0.000310
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.538
Element Family
Metalloid-Nonmetal
Solute Fraction
0.462
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.3039
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
10.8404
J/mol·K
Ω Parameter
0.0929
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
50.519%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
1.0415
smaller = more stable mixing
VEC
3.538
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-68.207
kJ/mol; negative = exothermic mixing
Entropy Norm
0.8101
SS Former
0
Phase Tendency
AM

Related Tasks

Related computation task IDs (2)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1048054
Reference Citation

The crystal structure and related material properties of Sr2Ti2AlGaO7 were obtained from the Materials Project database (MP-ID: mp-1048054, 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

BibTeX
@article{Horton2025,
  author  = {Horton, Matthew K. and Huck, Patrick and Yang, Ruo Xi and Munro, Jason M. and Dwaraknath, Shyam and Ganose, Alex M. and Kingsbury, Ryan S. and Wen, Mingjian and Shen, Jimmy X. and Mathis, Tyler S. and Kaplan, Aaron D. and Berket, Karlo and Riebesell, Janosh and George, Janine and Rosen, Andrew S. and Spotte-Smith, Evan W. C. and McDermott, Matthew J. and Cohen, Orion A. and Dunn, Alex and Kuner, Matthew C. and Rignanese, Gian-Marco and Petretto, Guido and Waroquiers, David and Griffin, Sinead M. and Neaton, Jeffrey B. and Chrzan, Daryl C. and Asta, Mark and Hautier, Geoffroy and Cholia, Shreyas and Ceder, Gerbrand and Ong, Shyue Ping and Jain, Anubhav and Persson, Kristin A.},
  title   = {Accelerated data-driven materials science with the Materials Project},
  journal = {Nature Materials},
  year    = {2025},
  volume  = {24},
  number  = {10},
  pages   = {1522--1532},
  month   = {oct},
  doi     = {10.1038/s41563-025-02272-0},
  issn    = {1476-4660},
  url     = {https://doi.org/10.1038/s41563-025-02272-0},
  abstract = {The Materials Project was launched formally in 2011 to drive materials discovery forwards through high-throughput computation and open data. More than a decade later, the Materials Project has become an indispensable tool used by more than 600,000 materials researchers around the world. This Perspective describes how the Materials Project, as a data platform and a software ecosystem, has helped to shape research in data-driven materials science. We cover how sustainable software and computational methods have accelerated materials design while becoming more open source and collaborative in nature. Next, we present cases where the Materials Project was used to understand and discover functional materials. We then describe our efforts to meet the needs of an expanding user base, through technical infrastructure updates ranging from data architecture and cloud resources to interactive web applications. Finally, we discuss opportunities to better aid the research community, with the vision that more accessible and easy-to-understand materials data will result in democratized materials knowledge and an increasingly collaborative community.}
}

3D Crystal Structure Rendering

Loading 3D structure…

Style: Ball & Stick
Raw CIF Data
# generated using pymatgen
data_Sr2Ti2AlGaO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.16080300
_cell_length_b   5.33396784
_cell_length_c   13.62449527
_cell_angle_alpha   100.50680102
_cell_angle_beta   100.78836040
_cell_angle_gamma   90.24520109
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr2Ti2AlGaO7
_chemical_formula_sum   'Sr4 Ti4 Al2 Ga2 O14'
_cell_volume   361.95639814
_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
  Sr  Sr0  1  0.14948300  0.13888200  0.31563600  1.0
  Sr  Sr1  1  0.82592000  0.83415400  0.67637200  1.0
  Sr  Sr2  1  0.66014300  0.66445600  0.31830600  1.0
  Sr  Sr3  1  0.34493400  0.30789100  0.67375600  1.0
  Ti  Ti4  1  0.51769700  0.93091800  0.89598500  1.0
  Ti  Ti5  1  0.99273000  0.57002700  0.11173500  1.0
  Ti  Ti6  1  0.86147500  0.42769300  0.89592000  1.0
  Ti  Ti7  1  0.60492700  0.07435900  0.11285900  1.0
  Al  Al8  1  0.41051400  0.46953200  0.98687800  1.0
  Al  Al9  1  0.07850300  0.98835000  0.99540800  1.0
  Ga  Ga10  1  0.29357000  0.66971500  0.49644800  1.0
  Ga  Ga11  1  0.79597400  0.30697700  0.49737100  1.0
  O  O12  1  0.25826900  0.91782400  0.11466900  1.0
  O  O13  1  0.66669300  0.64367500  0.49950300  1.0
  O  O14  1  0.80109900  0.84087400  0.17499000  1.0
  O  O15  1  0.80817000  0.27195500  0.63155000  1.0
  O  O16  1  0.19923400  0.69025800  0.91460100  1.0
  O  O17  1  0.65192500  0.64095500  0.82163300  1.0
  O  O18  1  0.16658100  0.33251000  0.49567300  1.0
  O  O19  1  0.65276600  0.13969600  0.81986700  1.0
  O  O20  1  0.19512800  0.18449100  0.90560300  1.0
  O  O21  1  0.28763900  0.82837900  0.62989600  1.0
  O  O22  1  0.17233300  0.70619700  0.36325300  1.0
  O  O23  1  0.65710100  0.14920500  0.36474000  1.0
  O  O24  1  0.33148100  0.40572900  0.10409000  1.0
  O  O25  1  0.85763200  0.34665500  0.18015600  1.0
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