Ge8Na8Se20
Ge8Na8Se20 is a thermodynamically stable semiconducting compound composed of sodium, germanium, and selenium.
About Ge8Na8Se20
Ge8Na8Se20 is a complex ternary chalcogenide that exhibits semiconducting electronic behavior. As a thermodynamically stable phase residing on the convex hull, it represents a robust crystalline arrangement within its chemical system, supported by multiple documented structural variations across scientific databases. Its unique atomic configuration makes it a subject of interest for researchers investigating new semiconducting materials with predictable stability. The material is primarily utilized in fundamental materials science research to explore the relationship between structural composition and electronic properties. Its stability profile suggests potential for further development in solid-state devices where consistent performance is required.
Key Properties
Cross-validated computational properties for Ge8Na8Se20, 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.
Reported Structures
Lowest-energy structures reported for Ge8Na8Se20, 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. |
|---|---|---|---|---|---|
| Pna21 (No. 33) | orthorhombic | 1.50 | 0.0000 | -4.131 | 3.98 |
| Cmcm (No. 63) | orthorhombic | 1.85 | 0.0074 | -4.123 | 3.89 |
| Cmcm (No. 63) | — | — | — | — | — |
| Cmcm (No. 63) | — | — | — | — | — |
| Pna21 (No. 33) | — | — | — | — | — |
| — | — | — | — | — | 3.89 |
| Pna21 (No. 33) | orthorhombic | — | — | — | 1.02 |
Applications
Where Ge8Na8Se20 is used.
Frequently Asked Questions
Common questions about Ge8Na8Se20, answered from cross-validated data.
What is Ge8Na8Se20?
Ge8Na8Se20 is a thermodynamically stable semiconducting compound composed of sodium, germanium, and selenium.
What is Ge8Na8Se20 used for?
What is the band gap of Ge8Na8Se20?
Is Ge8Na8Se20 a metal, semiconductor, or insulator?
Is Ge8Na8Se20 thermodynamically stable?
What is the crystal structure of Ge8Na8Se20?
What is the density of Ge8Na8Se20?
How many polymorphs of Ge8Na8Se20 are known?
What elements does Ge8Na8Se20 contain?
Where does the data for Ge8Na8Se20 come from?
How It Compares
As a distinct member of the sodium-germanium-selenium system, Ge8Na8Se20 serves as a foundational example of stable ternary chalcogenide formation. Without direct structural analogs provided in this specific class, it stands as a primary reference point for understanding how alkali metal incorporation influences the semiconducting nature of germanium-based chalcogenide frameworks.
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).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
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