SrPIr
SrPIr is a stable, semiconducting alloy composed of strontium, phosphorus, and iridium that serves as a key material in platinum-group research.
About SrPIr
SrPIr is a distinct semiconducting compound within the platinum-group alloy catalyst family. Its position on the thermodynamic convex hull highlights its inherent stability, making it a reliable subject for structural analysis and materials characterization. The compound has been extensively documented, with multiple structural variations identified across major databases. This stability and electronic nature suggest potential utility in specialized catalytic or electronic applications where precise material behavior is required. As a member of this diverse class, it contributes to the broader understanding of how strontium, phosphorus, and iridium interact to form stable, semiconducting phases.
Key Properties
Cross-validated computational properties for SrPIr, 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.
Reported Structures
Lowest-energy structures reported for SrPIr, 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. |
|---|---|---|---|---|---|
| P3221 (No. 154) | trigonal | 0.44 | 0.0000 | -28.597 | 9.22 |
| P213 (No. 198) | cubic | 0.00 | 0.0000 | -26.616 | 8.07 |
| P213 (No. 198) | — | — | — | — | — |
| P4/nmm (No. 129) | Tetragonal | — | — | — | 6.85 |
| P4/nmm (No. 129) | Tetragonal | — | — | — | 7.82 |
| P4/nmm (No. 129) | Tetragonal | — | — | — | 7.58 |
Applications
Where SrPIr is used.
Frequently Asked Questions
Common questions about SrPIr, answered from cross-validated data.
What is SrPIr?
SrPIr is a stable, semiconducting alloy composed of strontium, phosphorus, and iridium that serves as a key material in platinum-group research.
What is SrPIr used for?
What is the band gap of SrPIr?
Is SrPIr a metal, semiconductor, or insulator?
Is SrPIr thermodynamically stable?
What is the crystal structure of SrPIr?
What is the density of SrPIr?
How many polymorphs of SrPIr are known?
What elements does SrPIr contain?
Where does the data for SrPIr come from?
How It Compares
Within the platinum-group alloy catalysts class.
Unlike many platinum-group alloys such as As2Ir or P3Ru, which often exhibit metallic behavior, SrPIr is notable for its semiconducting electronic character. While siblings like BaPd or LaRh focus on different transition metal combinations, SrPIr occupies a unique niche by incorporating phosphorus, which significantly influences its electronic structure compared to the more traditional binary intermetallics in this class.
Related Compounds
Other Platinum-Group Alloy Catalysts in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- mpaloe — Data from mpaloe.
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