Hg1Pb1Pd2
Hg1Pb1Pd2 is a semiconducting intermetallic alloy composed of mercury, lead, and palladium that is primarily studied for its structural properties.
About Hg1Pb1Pd2
Hg1Pb1Pd2 is a specialized intermetallic compound within the platinum-group alloy catalyst class. Characterized by its semiconducting electronic nature, it represents a complex arrangement of mercury, lead, and palladium atoms that has been documented across multiple structural configurations.
While this material exhibits interesting structural diversity, its position above the thermodynamic hull suggests it is inherently unstable under standard conditions. Its study contributes to the broader understanding of how heavy elements interact within palladium-based catalytic systems.
Key Properties
Cross-validated computational properties for Hg1Pb1Pd2, 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 Hg1Pb1Pd2, 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 | 0.67 | 1.3485 | -2.462 | 1.00 |
| Cm (No. 8) | — | — | — | — | — |
| Pmm2 (No. 25) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| I4/mmm (No. 139) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
| Cmmm (No. 65) | — | — | — | — | — |
| F-43m (No. 216) | — | — | — | — | — |
| P2/m (No. 10) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
Applications
Where Hg1Pb1Pd2 is used.
Frequently Asked Questions
Common questions about Hg1Pb1Pd2, answered from cross-validated data.
What is Hg1Pb1Pd2?
Hg1Pb1Pd2 is a semiconducting intermetallic alloy composed of mercury, lead, and palladium that is primarily studied for its structural properties.
What is Hg1Pb1Pd2 used for?
What is the band gap of Hg1Pb1Pd2?
Is Hg1Pb1Pd2 a metal, semiconductor, or insulator?
Is Hg1Pb1Pd2 thermodynamically stable?
What is the crystal structure of Hg1Pb1Pd2?
What is the density of Hg1Pb1Pd2?
How many polymorphs of Hg1Pb1Pd2 are known?
What elements does Hg1Pb1Pd2 contain?
Where does the data for Hg1Pb1Pd2 come from?
How It Compares
Within the platinum-group alloy catalysts class.
Unlike more stable or well-characterized members of the platinum-group alloy class such as As2Pt or GeRu, Hg1Pb1Pd2 is distinguished by its relative thermodynamic instability. While many siblings in this group are prized for their robust catalytic performance, this compound serves primarily as a subject of structural research rather than a standard industrial catalyst.
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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