Ge2Se1Te1
Ge2Se1Te1 is a semiconducting chalcogenide alloy used in the development of phase-change memory technology.
About Ge2Se1Te1
Ge2Se1Te1 is a semiconducting chalcogenide alloy that belongs to the class of phase-change memory materials. As a metastable compound, it is characterized by its ability to transition between amorphous and crystalline states, a property that is essential for high-speed data storage applications.
This material is of significant interest in materials science due to its structural versatility, with numerous reported configurations. Its electronic properties make it a candidate for advanced memory architectures that require efficient switching and long-term stability in electronic devices.
Key Properties
Cross-validated computational properties for Ge2Se1Te1, aggregated across 2 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 Ge2Se1Te1, 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. |
|---|---|---|---|---|---|
| R-3m (No. 166) | trigonal | 0.25 | 0.0250 | -4.324 | 5.91 |
| P4/mmm (No. 123) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
| Fm-3m (No. 225) | — | — | — | — | — |
| Pm (No. 6) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| Pmmm (No. 47) | — | — | — | — | — |
| Pmmm (No. 47) | — | — | — | — | — |
| Cm (No. 8) | — | — | — | — | — |
| Cmmm (No. 65) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| R-3m (No. 166) | — | — | — | — | — |
Applications
Where Ge2Se1Te1 is used.
Frequently Asked Questions
Common questions about Ge2Se1Te1, answered from cross-validated data.
What is Ge2Se1Te1?
Ge2Se1Te1 is a semiconducting chalcogenide alloy used in the development of phase-change memory technology.
What is Ge2Se1Te1 used for?
What is the band gap of Ge2Se1Te1?
Is Ge2Se1Te1 a metal, semiconductor, or insulator?
Is Ge2Se1Te1 thermodynamically stable?
What is the crystal structure of Ge2Se1Te1?
What is the density of Ge2Se1Te1?
How many polymorphs of Ge2Se1Te1 are known?
What elements does Ge2Se1Te1 contain?
Where does the data for Ge2Se1Te1 come from?
How It Compares
Within the phase-change memory materials class.
Within the diverse family of phase-change materials, Ge2Se1Te1 occupies a niche position alongside well-established compounds like Ge2Sb2Te5 and GeTe. While GeTe serves as a foundational binary system for phase-change research, the addition of selenium in Ge2Se1Te1 modifies the kinetics of the phase transition, offering a tunable alternative for optimizing the thermal stability and switching speeds required for modern memory cells.
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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