SrGe2
SrGe2 is a stable, semiconducting intermetallic compound formed from strontium and germanium.
About SrGe2
SrGe2 is a thermodynamically stable intermetallic compound composed of strontium and germanium. Its electronic character classifies it as a semiconductor, making it a subject of interest for researchers investigating new functional materials with predictable phase stability.
Because it resides on the convex hull, this material exhibits robust structural integrity. Its existence across multiple reported structural configurations highlights its versatility and the complexity of its bonding environment in the solid state.
Key Properties
Cross-validated computational properties for SrGe2, 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 SrGe2. 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 SrGe2, 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. |
|---|---|---|---|---|---|
| — | — | 0.00 | 0.0000 | -0.496 | — |
| P-3m1 (No. 164) | trigonal | 0.00 | 0.0000 | -14.855 | 5.08 |
| P-3m1 (No. 164) | trigonal | 0.00 | 0.0000 | -0.573 | — |
| — | — | 0.59 | 0.0102 | -0.486 | — |
| Pnma (No. 62) | orthorhombic | 0.34 | 0.0149 | -14.840 | 4.75 |
| Pnma (No. 62) | orthorhombic | 0.35 | 0.0203 | -0.553 | — |
| — | — | 0.00 | 0.0223 | -0.474 | — |
| — | — | 0.00 | 0.1008 | -0.395 | — |
| — | — | 0.30 | 0.1344 | -0.361 | — |
| P1 (No. 1) | triclinic | — | — | — | 4.79 |
| Pnma (No. 62) | orthorhombic | — | — | — | 4.80 |
| P-1 (No. 2) | triclinic | — | — | — | 2.83 |
Applications
Where SrGe2 is used.
Frequently Asked Questions
Common questions about SrGe2, answered from cross-validated data.
What is SrGe2?
SrGe2 is a stable, semiconducting intermetallic compound formed from strontium and germanium.
What is SrGe2 used for?
What is the band gap of SrGe2?
Is SrGe2 a metal, semiconductor, or insulator?
Is SrGe2 thermodynamically stable?
What is the crystal structure of SrGe2?
What is the density of SrGe2?
How many polymorphs of SrGe2 are known?
What elements does SrGe2 contain?
Where does the data for SrGe2 come from?
How It Compares
As a stable semiconducting intermetallic, SrGe2 serves as a foundational example of how alkaline earth metals and group fourteen elements can combine to form ordered, crystalline phases with distinct electronic properties.
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.
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
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