C2Ge2
C2Ge2 is a semiconducting carbon-germanium compound that exhibits a wide range of structural configurations despite being thermodynamically metastable.
About C2Ge2
C2Ge2 is a semiconducting compound composed of carbon and germanium. It represents a complex structural arrangement that has been documented across multiple databases, reflecting significant interest in its potential atomic configurations.
While its thermodynamic profile suggests it exists above the hull, the high number of reported structures indicates that researchers are actively investigating its stability and potential for synthesis. It serves as an intriguing subject for those studying the intersection of group 14 elements.
Key Properties
Cross-validated computational properties for C2Ge2, 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 C2Ge2, 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. |
|---|---|---|---|---|---|
| F-43m (No. 216) | cubic | 1.66 | 0.4384 | -11.471 | 5.76 |
| P63mc (No. 186) | hexagonal | 2.38 | 0.4431 | -11.466 | 5.78 |
| Fm-3m (No. 225) | cubic | 0.00 | 1.2718 | -10.638 | 6.66 |
| I41/amd (No. 141) | — | — | — | — | — |
| I41/amd (No. 141) | — | — | — | — | — |
| P63/mmc (No. 194) | — | — | — | — | — |
| I41/amd (No. 141) | — | — | — | — | — |
| C2/m (No. 12) | — | — | — | — | — |
| Cmcm (No. 63) | — | — | — | — | — |
| I4/mmm (No. 139) | — | — | — | — | — |
| Fm-3m (No. 225) | — | — | — | — | — |
| P4/nmm (No. 129) | — | — | — | — | — |
Applications
Where C2Ge2 is used.
Frequently Asked Questions
Common questions about C2Ge2, answered from cross-validated data.
What is C2Ge2?
C2Ge2 is a semiconducting carbon-germanium compound that exhibits a wide range of structural configurations despite being thermodynamically metastable.
What is C2Ge2 used for?
What is the band gap of C2Ge2?
Is C2Ge2 a metal, semiconductor, or insulator?
Is C2Ge2 thermodynamically stable?
What is the crystal structure of C2Ge2?
What is the density of C2Ge2?
How many polymorphs of C2Ge2 are known?
What elements does C2Ge2 contain?
Where does the data for C2Ge2 come from?
How It Compares
As a unique binary compound of carbon and germanium, C2Ge2 occupies a distinct position in materials science research. Unlike more common or stable carbides, this material is characterized by its complex structural variety and its status as a metastable phase, making it a focal point for studies on non-equilibrium synthesis and structural evolution.
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).
- nomad — Data from NOMAD. Cite: Draxl & Scheffler, J. Phys. Mater. 2, 036001 (2019).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
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