Ag4Nb8O22
Ag4Nb8O22 is a metastable, semiconducting silver niobate oxide used in research for its unique structural and electronic properties.
About Ag4Nb8O22
Ag4Nb8O22 is a complex silver-based niobate oxide that exhibits semiconducting electronic behavior. As a metastable phase, it represents a unique structural arrangement within the silver-niobium-oxygen ternary system, offering researchers a distinct platform for studying transition metal oxide chemistry.
Its significance lies in its potential for specialized electronic applications where specific semiconducting properties are required. Because it exists in a metastable state, it is a subject of interest for synthesis studies aimed at understanding the stability and phase transformation pathways of complex oxides.
Key Properties
Cross-validated computational properties for Ag4Nb8O22, 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.
Reported Structures
Lowest-energy structures reported for Ag4Nb8O22, 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. |
|---|---|---|---|---|---|
| R3 (No. 146) | trigonal | 2.34 | 0.0281 | -8.439 | 5.84 |
| R3c (No. 161) | trigonal | 2.37 | 0.0297 | -8.438 | 5.86 |
| Cc (No. 9) | monoclinic | 2.18 | 0.0304 | -8.437 | 5.87 |
| R-3c (No. 167) | trigonal | 2.08 | 0.0329 | -8.434 | 5.89 |
| Cc (No. 9) | — | — | — | — | — |
| R3 (No. 146) | — | — | — | — | — |
| R-3c (No. 167) | — | — | — | — | — |
| No. 0 | unknown | — | — | — | 1.54 |
| R3c (No. 161) | — | — | — | — | — |
Applications
Where Ag4Nb8O22 is used.
Frequently Asked Questions
Common questions about Ag4Nb8O22, answered from cross-validated data.
What is Ag4Nb8O22?
Ag4Nb8O22 is a metastable, semiconducting silver niobate oxide used in research for its unique structural and electronic properties.
What is Ag4Nb8O22 used for?
What is the band gap of Ag4Nb8O22?
Is Ag4Nb8O22 a metal, semiconductor, or insulator?
Is Ag4Nb8O22 thermodynamically stable?
What is the crystal structure of Ag4Nb8O22?
What is the density of Ag4Nb8O22?
How many polymorphs of Ag4Nb8O22 are known?
What elements does Ag4Nb8O22 contain?
Where does the data for Ag4Nb8O22 come from?
How It Compares
As a unique silver niobate oxide, this compound serves as a distinct entry in the landscape of ternary oxides. Without closely related siblings in the immediate class, it stands as a specialized material that highlights the diverse structural possibilities available when combining silver and niobium in oxygen-rich environments.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
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