Ca2Bi2O5
Ca2Bi2O5 is a semiconducting bismuth-calcium oxide that is theoretically stable enough to be synthesized for research purposes.
About Ca2Bi2O5
Ca2Bi2O5 is a semiconducting oxide composed of calcium, bismuth, and oxygen. Its position near the thermodynamic stability hull suggests that it is a viable target for experimental synthesis and structural characterization.
This material is of interest to researchers exploring complex bismuth-based oxides. Given its electronic character, it may offer unique properties suitable for specialized electronic or optoelectronic applications where semiconducting behavior is required.
Key Properties
Cross-validated computational properties for Ca2Bi2O5, 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 Ca2Bi2O5. 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 Ca2Bi2O5, 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. |
|---|---|---|---|---|---|
| P-1 (No. 2) | triclinic | 2.50 | 0.0075 | -6.451 | 6.20 |
| — | — | 1.89 | 0.0449 | -2.212 | — |
| Pbam (No. 55) | orthorhombic | 2.10 | 0.1721 | -6.286 | 6.45 |
| Pbam (No. 55) | orthorhombic | 1.53 | 0.1878 | -2.037 | — |
| — | — | 0.00 | 0.4175 | -1.840 | — |
| Pbam (No. 55) | orthorhombic | — | — | — | 6.61 |
| Pbam (No. 55) | orthorhombic | — | — | — | 6.45 |
| Pbam (No. 55) | orthorhombic | — | — | — | 6.79 |
Synthesis Routes
Literature-extracted synthesis procedures targeting Ca2Bi2O5.
Applications
Where Ca2Bi2O5 is used.
Frequently Asked Questions
Common questions about Ca2Bi2O5, answered from cross-validated data.
What is Ca2Bi2O5?
Ca2Bi2O5 is a semiconducting bismuth-calcium oxide that is theoretically stable enough to be synthesized for research purposes.
What is Ca2Bi2O5 used for?
What is the band gap of Ca2Bi2O5?
Is Ca2Bi2O5 a metal, semiconductor, or insulator?
Is Ca2Bi2O5 thermodynamically stable?
What is the crystal structure of Ca2Bi2O5?
What is the density of Ca2Bi2O5?
How many polymorphs of Ca2Bi2O5 are known?
How is Ca2Bi2O5 synthesized?
What elements does Ca2Bi2O5 contain?
Where does the data for Ca2Bi2O5 come from?
How It Compares
As a member of the bismuth-calcium-oxygen system, this compound represents a distinct structural arrangement within its chemical family. It serves as a noteworthy example of how specific stoichiometry can lead to stable, semiconducting phases that warrant further investigation compared to more common binary oxides.
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)
- 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)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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