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BaO2

Elasticity Data ELA

MP-ID: mp-1105 · Space group: I4/mmm (#139)

Basic Information

Formula
BaO2
MP-ID
mp-1105
Elements
2
Sites
3
Density
5.5342
g/cm³
Volume
50.81
ų
Cell a
3.8380
Å
Cell b
3.8380
Å
Cell c
4.3888
Å
α Angle
115.93
°
β Angle
115.93
°
γ Angle
90.00
°
Space Group
I4/mmm
Point Group
4/mmm
Crystal System
Tetragonal
Bravais Lattice
Tetragonal I
Stability
Yes
Packing Fraction
0.7400

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
25.83 3.4491 48.1 (0,0,1)
26.58 3.3539 100.0 (1,0,-1)
33.01 2.7139 72.2 (1,1,-1)
42.38 2.1328 12.5 (1,1,-2)
42.38 2.1328 12.5 (1,-1,1)
42.38 2.1328 24.9 (1,-1,-1)
46.01 1.9725 32.6 (1,0,-2)
46.01 1.9725 10.9 (0,1,1)
47.37 1.9190 12.3 (2,0,-1)
47.37 1.9190 12.3 (0,2,-1)
53.11 1.7246 3.7 (0,0,2)
54.74 1.6769 5.8 (2,0,-2)
54.74 1.6769 11.6 (0,2,-2)
54.74 1.6769 5.8 (0,2,0)
55.14 1.6656 3.6 (2,1,-2)
55.14 1.6656 14.5 (1,2,-2)
55.14 1.6656 10.9 (1,2,-1)
63.96 1.4555 2.3 (1,1,-3)
63.96 1.4555 2.3 (1,-1,2)
63.96 1.4555 4.5 (1,-1,-2)
68.18 1.3755 6.5 (2,1,-3)
68.18 1.3755 3.3 (1,-2,2)
68.18 1.3755 9.8 (2,-1,-2)
68.18 1.3755 6.5 (1,2,0)
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Energy Properties

Formation Energy/atom
-2.17019
eV/atom
Energy/atom
-6.10849
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-14.8470
eV/atom
Volume/atom
16.94
ų
c/a Ratio
1.1435

Electronic Properties

Metallic
Non-metal
Band Gap
2.235
eV
Direct Gap
Yes
CBM
N/A
eV

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
0.0000
μB
Mag. Ordering
Unknown
Mag. Sites
0
Magnetization/Volume
0.000000
μB/ų

Elastic Properties

KVRH
65.160
GPa
GVRH
35.973
GPa
Young's Modulus E
91.146
GPa
Poisson Ratio ν
0.267
Pugh Ratio K/G
1.811
Vickers Hardness Est.
5.117
GPa
Ductility
Brittle
Anisotropy
0.231
Lame λ
41.178
GPa

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.667
Element Family
Metalloid-Nonmetal
Solute Fraction
0.333
Interstitial Fraction
0.000

Elasticity Features

Elastic Modulus Comparison (GPa)
Elastic Features
Elastic Anisotropy AU
0.2310
Homogeneous Poisson ν
0.2670
Homogeneity
0.2670

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1105
Reference Citation

The crystal structure and related material properties of BaO2 were obtained from the Materials Project database (MP-ID: mp-1105, 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_BaO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.83801512
_cell_length_b   3.83801452
_cell_length_c   4.38878953
_cell_angle_alpha   115.92869987
_cell_angle_beta   115.92869790
_cell_angle_gamma   89.99999198
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BaO2
_chemical_formula_sum   'Ba1 O2'
_cell_volume   50.80647162
_cell_formula_units_Z   1
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
  Ba  Ba0  1  -0.00000000  -0.00000000  -0.00000000  1.0
  O  O1  1  0.39166473  0.39166473  0.78332846  1.0
  O  O2  1  0.60833527  0.60833527  0.21667154  1.0
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