RbGe
RbGe is a thermodynamically stable semiconducting binary compound formed from rubidium and germanium.
About RbGe
RbGe is a binary compound composed of rubidium and germanium that exhibits semiconducting electronic properties. As a thermodynamically stable phase located on the convex hull, it represents a robust structural arrangement of these two elements. Its stability makes it a significant subject for researchers investigating the fundamental interactions between alkali metals and group fourteen elements.
The compound is characterized by a high degree of structural diversity, with numerous reported configurations across multiple databases. This wealth of structural data underscores its importance in solid-state chemistry, providing a valuable model for understanding phase formation and electronic behavior in binary systems.
Key Properties
Cross-validated computational properties for RbGe, aggregated across 3 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 RbGe. 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 RbGe, 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. |
|---|---|---|---|---|---|
| — | — | 1.20 | 0.0000 | -0.200 | — |
| P-43n (No. 218) | cubic | 1.02 | 0.0000 | -2.993 | 3.64 |
| I41/acd (No. 142) | tetragonal | 1.41 | 0.0132 | -2.980 | 3.77 |
| — | — | 0.00 | 0.6743 | 0.475 | — |
| — | — | 0.00 | 0.6904 | 0.491 | — |
| — | — | 0.00 | 0.6989 | 0.499 | — |
| — | — | 0.00 | 0.7207 | 0.521 | — |
| Fm-3m (No. 225) | cubic | 0.00 | 0.7330 | 0.718 | — |
| Fm-3m (No. 225) | cubic | 0.00 | 1.0443 | -1.949 | 2.83 |
| — | — | 0.00 | 1.0686 | 0.869 | — |
| — | — | 0.00 | 1.3349 | 1.135 | — |
| C2/m (No. 12) | monoclinic | — | — | — | 4.71 |
Frequently Asked Questions
Common questions about RbGe, answered from cross-validated data.
What is RbGe?
RbGe is a thermodynamically stable semiconducting binary compound formed from rubidium and germanium.
What is the band gap of RbGe?
Is RbGe a metal, semiconductor, or insulator?
Is RbGe thermodynamically stable?
What is the crystal structure of RbGe?
What is the density of RbGe?
How many polymorphs of RbGe are known?
What elements does RbGe contain?
Where does the data for RbGe come from?
How It Compares
As a standalone binary compound in this context, RbGe serves as a primary reference point for studying the interplay between alkali metal cations and germanium-based anionic frameworks. Its position on the convex hull establishes it as a baseline for thermodynamic stability in similar binary systems.
Data sources & attribution
- 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)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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