Co1Ir1Y2
Co1Ir1Y2 is a semiconducting ternary alloy containing cobalt, iridium, and yttrium that is primarily studied for its structural properties within the platinum-group catalyst family.
About Co1Ir1Y2
Co1Ir1Y2 is a complex ternary alloy featuring cobalt, iridium, and yttrium. As a member of the platinum-group alloy catalyst class, it exhibits semiconducting electronic behavior, which distinguishes it from the typical metallic nature of many related noble metal compounds. Its structural complexity is highlighted by a significant number of reported configurations within material databases.
Despite its interesting electronic profile, the compound is characterized as being thermodynamically unstable, sitting above the hull in energy landscapes. This suggests that while it remains a subject of academic interest for structural studies, its practical deployment in catalytic environments may be limited by its propensity to favor more stable phases under standard conditions.
Key Properties
Cross-validated computational properties for Co1Ir1Y2, aggregated across 2 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 Co1Ir1Y2, 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. |
|---|---|---|---|---|---|
| Immm (No. 71) | orthorhombic | 0.21 | 2.8991 | -4.889 | 0.73 |
| P4/mmm (No. 123) | — | — | — | — | — |
| F-43m (No. 216) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| Pmm2 (No. 25) | — | — | — | — | — |
| Fm-3m (No. 225) | — | — | — | — | — |
| P2/m (No. 10) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
| Cm (No. 8) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
Applications
Where Co1Ir1Y2 is used.
Frequently Asked Questions
Common questions about Co1Ir1Y2, answered from cross-validated data.
What is Co1Ir1Y2?
Co1Ir1Y2 is a semiconducting ternary alloy containing cobalt, iridium, and yttrium that is primarily studied for its structural properties within the platinum-group catalyst family.
What is Co1Ir1Y2 used for?
What is the band gap of Co1Ir1Y2?
Is Co1Ir1Y2 a metal, semiconductor, or insulator?
Is Co1Ir1Y2 thermodynamically stable?
What is the crystal structure of Co1Ir1Y2?
What is the density of Co1Ir1Y2?
How many polymorphs of Co1Ir1Y2 are known?
What elements does Co1Ir1Y2 contain?
Where does the data for Co1Ir1Y2 come from?
How It Compares
Within the platinum-group alloy catalysts class.
Unlike more robust and thermodynamically stable members of the platinum-group alloy class such as As2Pt or GeRu, Co1Ir1Y2 occupies a more precarious position in the phase space. While many of its siblings are noted for their metallic conductivity and structural reliability, this compound stands out for its semiconducting nature and its status as a metastable phase, reflecting the diverse and often challenging synthesis landscape of ternary iridium-based alloys.
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).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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