Ag1Pb1Pd2
Ag1Pb1Pd2 is a semiconducting, metastable ternary alloy composed of silver, lead, and palladium that belongs to the platinum-group catalyst family.
About Ag1Pb1Pd2
Ag1Pb1Pd2 is a complex intermetallic compound categorized within the platinum-group alloy catalysts. Characterized by a semiconducting electronic structure, this material represents a unique combination of silver, lead, and palladium, reflecting the diverse structural chemistry found in transition metal alloys.
While it exhibits a significant number of reported structural configurations, the compound resides above the thermodynamic hull. This suggests that it is a metastable phase, which is a common feature in specialized catalytic alloys that require precise synthesis conditions to stabilize their specific atomic arrangements.
Key Properties
Cross-validated computational properties for Ag1Pb1Pd2, 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 Ag1Pb1Pd2, 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 | 0.64 | 1.7687 | -29.340 | 0.86 |
| Pmm2 (No. 25) | — | — | — | — | — |
| P2/m (No. 10) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
| R-3m (No. 166) | — | — | — | — | — |
| Fm-3m (No. 225) | — | — | — | — | — |
| Pmm2 (No. 25) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| C2/m (No. 12) | — | — | — | — | — |
| I4/mmm (No. 139) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
Applications
Where Ag1Pb1Pd2 is used.
Frequently Asked Questions
Common questions about Ag1Pb1Pd2, answered from cross-validated data.
What is Ag1Pb1Pd2?
Ag1Pb1Pd2 is a semiconducting, metastable ternary alloy composed of silver, lead, and palladium that belongs to the platinum-group catalyst family.
What is Ag1Pb1Pd2 used for?
What is the band gap of Ag1Pb1Pd2?
Is Ag1Pb1Pd2 a metal, semiconductor, or insulator?
Is Ag1Pb1Pd2 thermodynamically stable?
What is the crystal structure of Ag1Pb1Pd2?
What is the density of Ag1Pb1Pd2?
How many polymorphs of Ag1Pb1Pd2 are known?
What elements does Ag1Pb1Pd2 contain?
Where does the data for Ag1Pb1Pd2 come from?
How It Compares
Within the platinum-group alloy catalysts class.
Unlike more thermodynamically robust members of the platinum-group alloy class such as GeRu or P3Ru, Ag1Pb1Pd2 is distinguished by its metastable nature and semiconducting behavior. While many siblings in this group are prized for their high stability in harsh catalytic environments, Ag1Pb1Pd2 offers a different structural profile that highlights the complexity of ternary systems involving heavy post-transition metals like lead.
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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