Ge3Bi2O9
Ge3Bi2O9 is a metastable semiconducting oxide containing germanium, bismuth, and oxygen that is currently the subject of structural and electronic research.
About Ge3Bi2O9
Ge3Bi2O9 is a complex oxide composed of germanium, bismuth, and oxygen. As a semiconducting material, it represents an intriguing subject for solid-state chemistry due to its electronic properties and the specific coordination environments formed by its constituent elements. Its nature as a metastable phase suggests that its synthesis and structural integrity are highly sensitive to processing conditions, making it a focal point for researchers studying phase stability in ternary oxide systems. The existence of multiple reported structures highlights the structural diversity and potential for polymorphism within this chemical composition. Understanding these configurations is essential for evaluating its viability in specialized electronic or optical applications where specific structural motifs are required to achieve desired performance characteristics.
Key Properties
Cross-validated computational properties for Ge3Bi2O9, aggregated across 3 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of Ge3Bi2O9. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Reported Structures
Lowest-energy structures reported for Ge3Bi2O9, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| — | — | 3.04 | 0.0062 | -1.792 | — |
| P63/m (No. 176) | hexagonal | 2.98 | 0.0306 | -6.700 | 6.22 |
| P63/m (No. 176) | hexagonal | 2.93 | 0.0463 | -1.614 | — |
| P63/m (No. 176) | hexagonal | — | — | — | 6.23 |
| P63/m (No. 176) | hexagonal | — | — | — | 6.30 |
| P63/m (No. 176) | hexagonal | — | — | — | 5.90 |
| P63/m (No. 176) | hexagonal | — | — | — | 6.07 |
Synthesis Routes
Literature-extracted synthesis procedures targeting Ge3Bi2O9.
Applications
Where Ge3Bi2O9 is used.
Frequently Asked Questions
Common questions about Ge3Bi2O9, answered from cross-validated data.
What is Ge3Bi2O9?
Ge3Bi2O9 is a metastable semiconducting oxide containing germanium, bismuth, and oxygen that is currently the subject of structural and electronic research.
What is Ge3Bi2O9 used for?
What is the band gap of Ge3Bi2O9?
Is Ge3Bi2O9 a metal, semiconductor, or insulator?
Is Ge3Bi2O9 thermodynamically stable?
What is the crystal structure of Ge3Bi2O9?
What is the density of Ge3Bi2O9?
How many polymorphs of Ge3Bi2O9 are known?
How is Ge3Bi2O9 synthesized?
What elements does Ge3Bi2O9 contain?
Where does the data for Ge3Bi2O9 come from?
How It Compares
As a unique ternary oxide, Ge3Bi2O9 occupies a distinct position in the landscape of bismuth-germanium-oxygen compounds. While it lacks direct structural siblings in this specific class, its metastable character distinguishes it from more common, highly stable oxides, positioning it as a specialized material for fundamental studies in phase control and structural evolution.
Data sources & attribution
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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