Sr2Ge
Sr2Ge is a thermodynamically stable semiconducting intermetallic compound formed from strontium and germanium.
About Sr2Ge
Sr2Ge is a thermodynamically stable intermetallic compound composed of strontium and germanium. As a member of the alkaline earth germanide family, it exhibits semiconducting electronic character, making it an interesting subject for fundamental research into electronic structure and bonding behavior. Its position on the convex hull confirms its robust stability under standard conditions. The compound has been extensively characterized across multiple databases, reflecting significant interest in its structural diversity and potential for specialized electronic applications. Its well-defined crystalline arrangements provide a stable platform for investigating the interplay between heavy alkaline earth metals and group fourteen elements.
Key Properties
Cross-validated computational properties for Sr2Ge, 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 Sr2Ge. 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 Sr2Ge, 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. |
|---|---|---|---|---|---|
| — | — | 0.57 | 0.0000 | -0.537 | — |
| Pnma (No. 62) | orthorhombic | 0.39 | 0.0000 | -0.632 | — |
| Pnma (No. 62) | orthorhombic | 0.36 | 0.0000 | -15.342 | 4.07 |
| — | — | 0.00 | 1.0697 | 0.532 | — |
| Pnma (No. 62) | orthorhombic | — | — | — | 4.07 |
| Pnnm (No. 58) | orthorhombic | — | — | — | 2.70 |
| Cm (No. 8) | monoclinic | — | — | — | 2.96 |
| Cm (No. 8) | monoclinic | — | — | — | 3.11 |
| P21/c (No. 14) | monoclinic | — | — | — | 2.56 |
| Pnma (No. 62) | orthorhombic | — | — | — | 4.08 |
| Cm (No. 8) | monoclinic | — | — | — | 3.52 |
| P21/c (No. 14) | monoclinic | — | — | — | 2.54 |
Applications
Where Sr2Ge is used.
Frequently Asked Questions
Common questions about Sr2Ge, answered from cross-validated data.
What is Sr2Ge?
Sr2Ge is a thermodynamically stable semiconducting intermetallic compound formed from strontium and germanium.
What is Sr2Ge used for?
What is the band gap of Sr2Ge?
Is Sr2Ge a metal, semiconductor, or insulator?
Is Sr2Ge thermodynamically stable?
What is the crystal structure of Sr2Ge?
How many polymorphs of Sr2Ge are known?
What elements does Sr2Ge contain?
Where does the data for Sr2Ge come from?
How It Compares
As a stable semiconducting germanide, Sr2Ge represents a reliable model system for studying the electronic properties of binary alkaline earth compounds. While it stands as a distinct phase within the strontium-germanium system, its behavior serves as a benchmark for understanding how stoichiometry influences the semiconducting nature of these intermetallic materials.
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)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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