Ag2O
Silver(I) oxide · Silver oxide
Silver(I) oxide is a stable, metallic compound of silver and oxygen widely utilized in electrochemical and catalytic applications.
About Silver(I) oxide
Silver(I) oxide is a thermodynamically stable compound that sits prominently on the convex hull, indicating its robust nature as a chemical species. Its metallic electronic character distinguishes it from many other simple oxides, facilitating its role in various electrochemical processes.
Due to its extensive documentation across numerous structural databases, this material is a highly studied subject in materials science. Its unique combination of stability and electronic properties makes it a valuable candidate for specialized applications in chemical synthesis and energy storage.
Key Properties
Cross-validated computational properties for Silver(I) oxide, aggregated across 5 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 Ag2O. 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 Ag2O, 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. |
|---|---|---|---|---|---|
| — | — | 0.20 | 0.0000 | -0.234 | — |
| Pn-3m (No. 224) | cubic | 0.15 | 0.0000 | -0.168 | — |
| Pn-3m (No. 224) | cubic | 0.00 | 0.0000 | -3.860 | 7.16 |
| Ibam (No. 72) | orthorhombic | 0.00 | 0.0192 | -3.841 | 7.78 |
| — | — | 0.42 | 0.0482 | -0.186 | — |
| — | — | 0.00 | 0.0642 | -0.170 | — |
| — | — | 0.00 | 0.0765 | -0.157 | — |
| P-3m1 (No. 164) | trigonal | 0.00 | 0.0854 | -0.082 | — |
| — | — | 0.00 | 0.0964 | -0.137 | — |
| — | — | 0.00 | 0.1074 | -0.126 | — |
| P1 (No. 1) | triclinic | 0.00 | 0.1087 | -3.752 | 6.87 |
| — | — | 0.00 | 0.1096 | -0.124 | — |
Applications
Where Silver(I) oxide is used.
Frequently Asked Questions
Common questions about Silver(I) oxide, answered from cross-validated data.
What is Ag2O?
Silver(I) oxide is a stable, metallic compound of silver and oxygen widely utilized in electrochemical and catalytic applications.
What is Ag2O used for?
What is the band gap of Ag2O?
Is Ag2O a metal, semiconductor, or insulator?
Is Ag2O thermodynamically stable?
What is the crystal structure of Ag2O?
How many polymorphs of Ag2O are known?
What elements does Ag2O contain?
Where does the data for Ag2O come from?
How It Compares
As a standalone subject in this context, Silver(I) oxide represents a benchmark for metallic oxides. Its thermodynamic stability ensures it remains a reliable material for research and industrial use, serving as a foundational example of how silver-based compounds behave under ambient conditions.
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)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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