AgH
Silver hydride · argentous hydride
Silver hydride is a metastable, semiconducting compound formed from silver and hydrogen that is primarily studied for its structural properties under high-pressure conditions.
About Silver hydride
Silver hydride is a binary compound composed of silver and hydrogen. It exhibits semiconducting electronic properties and is recognized as a metastable material that sits above the thermodynamic hull, indicating it is not typically found in stable, bulk equilibrium states under ambient conditions.
Despite its instability, this compound is of significant interest in high-pressure physics and theoretical chemistry. Researchers study its structural diversity across multiple phases to understand the bonding interactions between noble metals and hydrogen, which provides insights into potential superconducting or high-density hydrogen storage materials.
Key Properties
Cross-validated computational properties for Silver hydride, aggregated across 4 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 AgH. 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 AgH, 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. |
|---|---|---|---|---|---|
| P63mc (No. 186) | hexagonal | 0.85 | 0.1209 | -12.285 | 7.76 |
| — | — | 0.99 | 0.2071 | 0.207 | — |
| — | — | 0.90 | 0.2085 | 0.209 | — |
| P63mc (No. 186) | hexagonal | 0.80 | 0.2401 | 0.239 | — |
| F-43m (No. 216) | cubic | 0.87 | 0.2411 | 0.240 | — |
| F-43m (No. 216) | cubic | 0.81 | 0.2414 | 0.241 | — |
| P-6m2 (No. 187) | hexagonal | 0.00 | 0.3251 | 0.324 | — |
| — | — | 0.31 | 0.3618 | 0.362 | — |
| — | — | 0.21 | 0.3624 | 0.362 | — |
| — | — | 0.00 | 0.4247 | 0.425 | — |
| — | — | 0.00 | 0.6254 | 0.625 | — |
| — | — | 0.00 | 0.7794 | 0.779 | — |
Applications
Where Silver hydride is used.
Frequently Asked Questions
Common questions about Silver hydride, answered from cross-validated data.
What is AgH?
Silver hydride is a metastable, semiconducting compound formed from silver and hydrogen that is primarily studied for its structural properties under high-pressure conditions.
What is AgH used for?
What is the band gap of AgH?
Is AgH a metal, semiconductor, or insulator?
Is AgH thermodynamically stable?
What is the crystal structure of AgH?
What is the density of AgH?
How many polymorphs of AgH are known?
What elements does AgH contain?
Where does the data for AgH come from?
How It Compares
As a metastable binary hydride, silver hydride occupies a unique position in materials science where its synthesis often requires extreme conditions. Unlike more stable, naturally occurring metal hydrides, this compound serves as a critical model for investigating the limits of chemical bonding in silver-based systems.
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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