Sr
Strontium · Sr
Strontium is a stable, semiconducting alkaline earth metal that serves as a critical component in the synthesis and study of advanced inorganic materials.
About Strontium
Strontium is a highly reactive alkaline earth metal that exists in a thermodynamically stable state on the convex hull. Its unique electronic character, which exhibits semiconducting behavior, distinguishes it from more traditional metallic conductors and makes it a subject of significant interest in condensed matter physics.
With dozens of reported structures across various databases, strontium is a well-characterized element in the materials science community. Its ability to form diverse structural arrangements under different conditions underscores its versatility as a fundamental building block for complex inorganic compounds.
Key Properties
Cross-validated computational properties for Strontium, aggregated across 6 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 Sr. 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 Sr, 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. |
|---|---|---|---|---|---|
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.0000 | -15.146 | 2.58 |
| R-3m (No. 166) | trigonal | 0.00 | 0.0029 | -15.143 | 2.55 |
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.0270 | -15.119 | 2.56 |
| Fm-3m (No. 225) | cubic | 0.00 | 0.0448 | -15.101 | 2.61 |
| Im-3m (No. 229) | cubic | 0.00 | 0.0614 | -15.084 | 2.62 |
| I4/mcm (No. 140) | tetragonal | 0.00 | 0.1818 | -14.964 | 2.35 |
| P6/mmm (No. 191) | hexagonal | 0.00 | 0.2364 | -14.909 | 2.64 |
| I41/amd (No. 141) | tetragonal | 0.00 | 0.2586 | -14.887 | 2.62 |
| Pm-3m (No. 221) | cubic | 0.00 | 0.3971 | -14.749 | 2.57 |
| P4/mmm (No. 123) | tetragonal | 0.00 | 0.3997 | -14.746 | 2.63 |
| P6/mmm (No. 191) | hexagonal | 0.37 | 1.3997 | -13.746 | 0.31 |
| No. 0 | unknown | — | — | — | 0.65 |
Applications
Where Strontium is used.
Frequently Asked Questions
Common questions about Strontium, answered from cross-validated data.
What is Sr?
Strontium is a stable, semiconducting alkaline earth metal that serves as a critical component in the synthesis and study of advanced inorganic materials.
What is Sr used for?
What is the band gap of Sr?
Is Sr a metal, semiconductor, or insulator?
Is Sr thermodynamically stable?
What is the crystal structure of Sr?
What is the density of Sr?
How many polymorphs of Sr are known?
What elements does Sr contain?
Where does the data for Sr come from?
How It Compares
As a fundamental elemental solid, strontium serves as a primary reference point in materials science, providing a baseline for understanding the structural and electronic evolution of alkaline earth elements within the periodic table.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- nomad — Data from NOMAD. Cite: Draxl & Scheffler, J. Phys. Mater. 2, 036001 (2019).
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