TeI2
TeI2 is a metastable, semiconducting compound composed of tellurium and iodine that is primarily studied for its complex structural characteristics.
About TeI2
TeI2 is a binary compound consisting of tellurium and iodine. As a semiconducting material, it occupies a unique space in chalcogenide chemistry, characterized by its metastable nature which makes it a subject of significant interest for structural studies.
Its existence across numerous reported structures highlights its complexity and the challenges associated with its synthesis and stability. Researchers study this compound to better understand the bonding environments and electronic behaviors inherent in tellurium-based halides.
Key Properties
Cross-validated computational properties for TeI2, 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 TeI2, 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/mnm (No. 136) | tetragonal | 0.74 | 0.0686 | -2.352 | 3.86 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.02 |
| P-1 (No. 2) | Triclinic | — | — | — | 6.15 |
| P21 (No. 4) | Monoclinic | — | — | — | 7.44 |
| P21 (No. 4) | Monoclinic | — | — | — | 4.82 |
| P21 (No. 4) | Monoclinic | — | — | — | 5.47 |
| P42/mnm (No. 136) | Tetragonal | — | — | — | 3.86 |
| P42/mnm (No. 136) | Tetragonal | — | — | — | 3.93 |
| P42/mnm (No. 136) | Tetragonal | — | — | — | 3.91 |
| Cm (No. 8) | Monoclinic | — | — | — | 7.51 |
| Cm (No. 8) | Monoclinic | — | — | — | 5.06 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.37 |
Applications
Where TeI2 is used.
Frequently Asked Questions
Common questions about TeI2, answered from cross-validated data.
What is TeI2?
TeI2 is a metastable, semiconducting compound composed of tellurium and iodine that is primarily studied for its complex structural characteristics.
What is TeI2 used for?
What is the band gap of TeI2?
Is TeI2 a metal, semiconductor, or insulator?
Is TeI2 thermodynamically stable?
What is the crystal structure of TeI2?
What is the density of TeI2?
How many polymorphs of TeI2 are known?
What elements does TeI2 contain?
Where does the data for TeI2 come from?
How It Compares
As a distinct binary halide, TeI2 represents a specialized case within the broader landscape of tellurium-iodine systems, serving as a critical reference point for understanding the phase stability of metastable semiconducting materials.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
Analyze TeI2 in the Lattice Graph platform
Polymorph comparison, confidence scoring, supply-chain risk, and patent monitoring — across 53 integrated data sources.
Explore the Platform →