CrGe
CrGe is a metallic, metastable binary compound composed of chromium and germanium that is frequently studied for its diverse structural configurations.
About CrGe
CrGe is a metallic compound formed from the transition metal chromium and the metalloid germanium. Its electronic character is defined by its metallic nature, lacking a band gap, which influences its behavior in various solid-state environments. Given its metastable status, it represents a complex phase that requires specific synthesis conditions to stabilize. The compound has been subject to extensive structural investigation, appearing in numerous reported configurations across scientific databases. This high level of structural data richness highlights its significance in fundamental materials research, where understanding the interplay between chromium and germanium remains a key objective for predicting phase stability. Its role is primarily centered on exploring the diverse structural landscape of binary metal-germanides.
Key Properties
Cross-validated computational properties for CrGe, 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 CrGe. 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 CrGe, 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. |
|---|---|---|---|---|---|
| P213 (No. 198) | cubic | 0.00 | 0.0892 | -14.383 | 7.64 |
| — | — | 0.00 | 0.1019 | 0.014 | — |
| P213 (No. 198) | cubic | 0.00 | 0.1323 | 0.070 | — |
| — | — | 0.00 | 0.2059 | 0.118 | — |
| — | — | 0.00 | 0.2982 | 0.210 | — |
| — | — | 0.00 | 0.3099 | 0.222 | — |
| Pm-3m (No. 221) | cubic | 0.00 | 0.3281 | 0.266 | — |
| — | — | 0.00 | 0.3393 | 0.251 | — |
| — | — | 0.00 | 0.4085 | 0.320 | — |
| — | — | 0.00 | 1.0378 | 0.950 | — |
| P1 (No. 1) | triclinic | — | — | — | 3.73 |
| P-1 (No. 2) | triclinic | — | — | — | 5.87 |
Applications
Where CrGe is used.
Frequently Asked Questions
Common questions about CrGe, answered from cross-validated data.
What is CrGe?
CrGe is a metallic, metastable binary compound composed of chromium and germanium that is frequently studied for its diverse structural configurations.
What is CrGe used for?
What is the band gap of CrGe?
Is CrGe a metal, semiconductor, or insulator?
Is CrGe thermodynamically stable?
What is the crystal structure of CrGe?
What is the density of CrGe?
How many polymorphs of CrGe are known?
What elements does CrGe contain?
Where does the data for CrGe come from?
How It Compares
As a binary compound of chromium and germanium, CrGe occupies a unique position in materials science research. While many binary systems exhibit simple stoichiometric behavior, this compound is notable for its high structural diversity, serving as a primary subject for those studying metastable phases and the complex bonding environments possible between transition metals and group fourteen elements.
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)
- 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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