AuI
Gold(I) iodide · Aurous iodide
Gold(I) iodide is a binary inorganic compound consisting of gold and iodine. It is primarily utilized in specialized chemical research and as a precursor for the synthesis of other gold-containing materials.
AuI
Overview
Key Properties
Cross-validated computational properties for Gold(I) iodide, 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.
2.09 eV
Range across DFT structures
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.
0.000 eV/atom
Best (lowest) across sources
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.
On hull (stable)
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
45
4 databases, 15 space groups
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of AuI. 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.
1.00 / 1.00
Trust tier: medium
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
0.000 eV
EAH spread across sources
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
2
jarvis, materials_project
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
All match
Crystallography
Reported Structures
Lowest-energy structures reported for AuI, 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. |
|---|---|---|---|---|---|
| P42/ncm (No. 138) | tetragonal | 2.09 | 0.0000 | -2.665 | 7.79 |
| P21 (No. 4) | Monoclinic | — | — | — | 10.05 |
| Pma2 (No. 28) | Orthorhombic | — | — | — | 7.97 |
| Pma2 (No. 28) | Orthorhombic | — | — | — | 8.39 |
| C2/m (No. 12) | Monoclinic | — | — | — | 15.94 |
| C2/m (No. 12) | Monoclinic | — | — | — | 6.14 |
| Cm (No. 8) | Monoclinic | — | — | — | 6.06 |
| Pmma (No. 51) | Orthorhombic | — | — | — | 13.57 |
| P21/m (No. 11) | Monoclinic | — | — | — | 6.47 |
| P21/m (No. 11) | Monoclinic | — | — | — | 9.70 |
| P2/c (No. 13) | Monoclinic | — | — | — | 13.63 |
| P2/c (No. 13) | Monoclinic | — | — | — | 6.06 |
Uses
Applications
Where Gold(I) iodide is used.
Chemical synthesisMaterials science researchCatalysis studies
Reference
Frequently Asked Questions
Common questions about Gold(I) iodide, answered from cross-validated data.
What is AuI?
Gold(I) iodide is a binary inorganic compound consisting of gold and iodine. It is primarily utilized in specialized chemical research and as a precursor for the synthesis of other gold-containing materials.
More questions
What is AuI used for?
Gold(I) iodide (AuI) is used in chemical synthesis, materials science research, and catalysis studies.
What is the band gap of AuI?
Gold(I) iodide (AuI) has a DFT-computed band gap of 2.09 eV across 45 reported structures.
Is AuI a metal, semiconductor, or insulator?
With a band gap up to 2.09 eV it is a semiconductor.
Is AuI thermodynamically stable?
Yes — Gold(I) iodide (AuI) sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of AuI?
The lowest-energy reported polymorph of Gold(I) iodide (AuI) is tetragonal symmetry, space group P42/ncm (No. 138).
What is the density of AuI?
The computed density of the ground-state structure of Gold(I) iodide (AuI) is 7.79 g/cm³.
How many polymorphs of AuI are known?
45 structures of AuI are reported across 4 databases, spanning 15 distinct space groups.
What elements does AuI contain?
Gold(I) iodide (AuI) contains Au and I (2 elements).
Where does the data for AuI come from?
AuI data is cross-referenced from materials_project, mpaloe, cod.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
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