Bi2CaNb2O9
Bi2CaNb2O9 has a DFT band gap of Metallic / not reported across 3 reported structures in 1 space group; its reference structure is tetragonal (I4/mmm (No. 139)). Cross-validated across 2 computational databases.
Key Properties
Cross-validated computational properties for Bi2CaNb2O9, aggregated across 2 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 Bi2CaNb2O9. Tight agreement means computed properties can be trusted without re-running calculations.
Only 1 independent DFT source (materials_project) reports a hull energy for Bi2CaNb2O9, so cross-source agreement can't be assessed yet.
Reported Structures
Lowest-energy structures reported for Bi2CaNb2O9, 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. |
|---|---|---|---|---|---|
| I4/mmm (No. 139) | tetragonal | 0.00 | 0.5519 | -7.440 | 6.28 |
| — | — | — | — | — | 6.03 |
| — | — | — | — | — | 6.09 |
Synthesis Routes
Literature-extracted synthesis procedures targeting Bi2CaNb2O9.
Frequently Asked Questions
Common questions about Bi2CaNb2O9, answered from cross-validated data.
What is the band gap of Bi2CaNb2O9?
The reported DFT structures of Bi2CaNb2O9 show no band gap. Standard DFT often misses gaps (especially in transition-metal oxides), so this is not proof the real material is a metal.
Is Bi2CaNb2O9 a metal, semiconductor, or insulator?
Is Bi2CaNb2O9 thermodynamically stable?
What is the crystal structure of Bi2CaNb2O9?
What is the density of Bi2CaNb2O9?
How many polymorphs of Bi2CaNb2O9 are known?
How is Bi2CaNb2O9 synthesized?
What elements does Bi2CaNb2O9 contain?
Where does the data for Bi2CaNb2O9 come from?
Related Compounds
Other Lead-Free Piezoelectrics in the database.
Data sources & attribution
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- omat24 — Data from Meta Open Materials 2024 (OMat24), Meta FAIR. Cite: Barroso-Luque et al., arXiv:2410.12771 (2024). (CC-BY-4.0)
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