CsGe
CsGe is a stable, semiconducting binary compound formed from cesium and germanium.
About CsGe
CsGe is a binary inorganic compound composed of cesium and germanium. As a thermodynamically stable phase located on the convex hull, it represents a robust structural configuration that has been extensively documented across various crystallographic databases.
This material exhibits semiconducting electronic characteristics, making it an object of interest for fundamental studies in solid-state physics. Its stable nature provides a reliable baseline for researchers investigating the interplay between alkali metals and group fourteen elements in semiconductor design.
Key Properties
Cross-validated computational properties for CsGe, 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.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of CsGe. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Reported Structures
Lowest-energy structures reported for CsGe, 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. |
|---|---|---|---|---|---|
| P-43n (No. 218) | cubic | 1.33 | 0.0000 | -2.971 | 4.22 |
| — | — | 1.16 | 0.0000 | -0.211 | — |
| I41/acd (No. 142) | tetragonal | 0.98 | 0.0198 | -2.951 | 4.36 |
| Cmcm (No. 63) | orthorhombic | 0.00 | 0.1399 | -2.831 | 4.03 |
| — | — | 0.00 | 0.7682 | 0.557 | — |
| — | — | 0.00 | 0.7766 | 0.565 | — |
| — | — | 0.00 | 0.7851 | 0.574 | — |
| — | — | 0.00 | 0.8001 | 0.589 | — |
| — | — | 0.00 | 1.1390 | 0.928 | — |
| — | — | 0.00 | 1.3458 | 1.134 | — |
| P1 (No. 1) | triclinic | — | — | — | 2.66 |
| P1 (No. 1) | triclinic | — | — | — | 2.46 |
Applications
Where CsGe is used.
Frequently Asked Questions
Common questions about CsGe, answered from cross-validated data.
What is CsGe?
CsGe is a stable, semiconducting binary compound formed from cesium and germanium.
What is CsGe used for?
What is the band gap of CsGe?
Is CsGe a metal, semiconductor, or insulator?
Is CsGe thermodynamically stable?
What is the crystal structure of CsGe?
What is the density of CsGe?
How many polymorphs of CsGe are known?
What elements does CsGe contain?
Where does the data for CsGe come from?
How It Compares
As a distinct binary phase, CsGe serves as a primary example of stable cesium-germanium intermetallics. It occupies a unique position within the broader landscape of alkali-metal germanides, offering a well-defined structural framework that contrasts with more complex or less stable compositions in the same chemical family.
Data sources & attribution
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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