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Bi2B2O7

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-768952 · Space group: P-1 (#2)

Basic Information

Formula
Bi2B2O7
MP-ID
mp-768952
Elements
3
Sites
22
Density
6.8590
g/cm³
Volume
267.07
ų
Cell a
5.4317
Å
Cell b
6.5860
Å
Cell c
8.0111
Å
α Angle
108.52
°
β Angle
86.78
°
γ Angle
100.64
°
Space Group
P-1
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
11.65 7.5962 6.2 (0,0,1)
14.41 6.1473 21.2 (0,1,0)
15.44 5.7372 80.8 (0,1,-1)
16.61 5.3383 1.3 (1,0,0)
20.02 4.4360 28.3 (1,-1,0)
20.31 4.3732 8.2 (1,0,-1)
20.81 4.2691 11.1 (1,-1,1)
21.25 4.1810 11.3 (0,1,1)
23.36 3.8081 78.5 (0,1,-2)
23.93 3.7193 100.0 (1,1,0)
24.55 3.6256 1.7 (1,1,-1)
25.42 3.5044 79.5 (1,-1,-1)
27.28 3.2690 9.1 (1,-1,2)
27.69 3.2215 2.7 (0,2,-1)
28.67 3.1134 5.0 (1,1,1)
28.81 3.0987 70.7 (1,0,-2)
28.89 3.0908 98.8 (1,0,2)
29.05 3.0736 2.5 (0,2,0)
29.64 3.0136 88.1 (1,-2,1)
30.25 2.9550 3.5 (1,1,-2)
31.18 2.8686 5.6 (0,2,-2)
31.32 2.8559 13.5 (0,1,2)
32.96 2.7176 1.1 (1,-2,2)
33.58 2.6692 36.7 (2,0,0)
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Energy Properties

Formation Energy/atom
-1.70113
eV/atom
Energy/atom
-6.77155
eV/atom
Energy above Hull
0.3977
eV/atom
Uncorrected Energy
-6.6691
eV/atom
Volume/atom
12.14
ų
c/a Ratio
-

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
0.7489
μB
Mag. Ordering
FM
Mag. Sites
2
Magnetization/Volume
0.002800
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.636
Element Family
Metalloid-Nonmetal
Solute Fraction
0.364
Interstitial Fraction
0.182

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.9075
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
7.5452
J/mol·K
Ω Parameter
3.2966
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
45.105%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.6783
smaller = more stable mixing
VEC
4.000
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
1.284
kJ/mol; negative = exothermic mixing
Entropy Norm
0.8261
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
C
Score
0.401
Family
Interstitial Alloy
Matrix Element
O · 0.636

Related Tasks

Related computation task IDs (2)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-768952
Reference Citation

The crystal structure and related material properties of Bi2B2O7 were obtained from the Materials Project database (MP-ID: mp-768952, 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_Bi2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.43170800
_cell_length_b   6.58602463
_cell_length_c   8.01112566
_cell_angle_alpha   108.52028562
_cell_angle_beta   86.78235755
_cell_angle_gamma   100.63788194
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Bi2B2O7
_chemical_formula_sum   'Bi4 B4 O14'
_cell_volume   267.07175551
_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
  Bi  Bi0  1  0.81386500  0.59429600  0.85867900  1.0
  Bi  Bi1  1  0.27465800  0.19143100  0.60482000  1.0
  Bi  Bi2  1  0.72534200  0.80856900  0.39518000  1.0
  Bi  Bi3  1  0.18613500  0.40570400  0.14132100  1.0
  B  B4  1  0.64839300  0.15173900  0.83634600  1.0
  B  B5  1  0.20177300  0.67355500  0.57909500  1.0
  B  B6  1  0.79822700  0.32644500  0.42090500  1.0
  B  B7  1  0.35160700  0.84826100  0.16365400  1.0
  O  O8  1  0.47557800  0.30757200  0.87986700  1.0
  O  O9  1  0.90667000  0.27625300  0.86615600  1.0
  O  O10  1  0.38135200  0.98883200  0.03503800  1.0
  O  O11  1  0.05291800  0.83125000  0.60704700  1.0
  O  O12  1  0.19278700  0.56808100  0.70455000  1.0
  O  O13  1  0.66306100  0.39894100  0.57531600  1.0
  O  O14  1  0.57995500  0.99871500  0.66438200  1.0
  O  O15  1  0.42004500  0.00128500  0.33561800  1.0
  O  O16  1  0.33693900  0.60105900  0.42468400  1.0
  O  O17  1  0.80721300  0.43191900  0.29545000  1.0
  O  O18  1  0.94708200  0.16875000  0.39295300  1.0
  O  O19  1  0.61864800  0.01116800  0.96496200  1.0
  O  O20  1  0.09333000  0.72374700  0.13384400  1.0
  O  O21  1  0.52442200  0.69242800  0.12013300  1.0
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