Ag4Te2
Ag4Te2 has a DFT band gap of 0.07 eV across 37 reported structures in 18 space groups; its lowest-energy polymorph is monoclinic (P21/c (No. 14)). Cross-validated across 4 computational databases.
At a glance
Key Properties
Cross-validated computational properties for Ag4Te2, 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.
0.07 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.
37
4 databases, 18 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for Ag4Te2, 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. |
|---|---|---|---|---|---|
| P21/c (No. 14) | monoclinic | 0.00 | 0.0000 | -22.805 | 8.25 |
| Pc (No. 7) | monoclinic | 0.00 | 0.0361 | -22.769 | 7.23 |
| Cmce (No. 64) | orthorhombic | 0.00 | 0.0420 | -22.763 | 7.96 |
| I4/mmm (No. 139) | tetragonal | 0.00 | 0.0435 | -22.761 | 7.63 |
| P1 (No. 1) | triclinic | 0.00 | 0.0629 | -22.742 | 7.44 |
| P1 (No. 1) | triclinic | 0.07 | 2.3897 | -20.415 | 0.25 |
| Cmcm (No. 63) | — | — | — | — | — |
| P42/mnm (No. 136) | — | — | — | — | — |
| I41/amd (No. 141) | — | — | — | — | — |
| P63/mmc (No. 194) | — | — | — | — | — |
| C2/m (No. 12) | — | — | — | — | — |
| P63/mmc (No. 194) | — | — | — | — | — |
Reference
Frequently Asked Questions
Common questions about Ag4Te2, answered from cross-validated data.
What is the band gap of Ag4Te2?
Ag4Te2 has a DFT-computed band gap of 0.07 eV across 37 reported structures.
More questions
Is Ag4Te2 a metal, semiconductor, or insulator?
With a near-zero band gap it behaves as a (semi)metal.
Is Ag4Te2 thermodynamically stable?
Yes — Ag4Te2 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of Ag4Te2?
The lowest-energy reported polymorph of Ag4Te2 is monoclinic symmetry, space group P21/c (No. 14).
What is the density of Ag4Te2?
The computed density of the ground-state structure of Ag4Te2 is 8.25 g/cm³.
How many polymorphs of Ag4Te2 are known?
37 structures of Ag4Te2 are reported across 4 databases, spanning 18 distinct space groups.
What elements does Ag4Te2 contain?
Ag4Te2 contains Ag and Te (2 elements).
Where does the data for Ag4Te2 come from?
Ag4Te2 data is cross-referenced from materials_project, aflow.
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Related Compounds
Other Phase-Change Memory Materials in the database.
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).
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