NaPb
NaPb is a thermodynamically stable semiconducting intermetallic compound composed of sodium and lead.
About NaPb
NaPb is a distinct intermetallic compound formed from sodium and lead. As a thermodynamically stable phase residing on the convex hull, it represents a robust configuration of these elements that maintains structural integrity under standard conditions.
This material exhibits semiconducting electronic characteristics, making it an intriguing subject for fundamental research into the bonding behaviors of alkali-metal and heavy-metal alloys. Its existence across multiple reported structures highlights its significant role in the study of binary phase stability.
Key Properties
Cross-validated computational properties for NaPb, aggregated across 4 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 NaPb. 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 NaPb, 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. |
|---|---|---|---|---|---|
| I41/acd (No. 142) | tetragonal | 0.16 | 0.0000 | -30.195 | 6.14 |
| C2/m (No. 12) | Monoclinic | — | — | — | 2.14 |
| C2/m (No. 12) | Monoclinic | — | — | — | 2.44 |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.26 |
| P-1 (No. 2) | Triclinic | — | — | — | 2.44 |
| P-1 (No. 2) | Triclinic | — | — | — | 2.80 |
| P-1 (No. 2) | Triclinic | — | — | — | 4.23 |
| Pm-3m (No. 221) | cubic | — | — | — | 3.30 |
| — | — | — | — | — | 6.62 |
| No. 0 | unknown | — | — | — | 3.28 |
Applications
Where NaPb is used.
Frequently Asked Questions
Common questions about NaPb, answered from cross-validated data.
What is NaPb?
NaPb is a thermodynamically stable semiconducting intermetallic compound composed of sodium and lead.
What is NaPb used for?
What is the band gap of NaPb?
Is NaPb a metal, semiconductor, or insulator?
Is NaPb thermodynamically stable?
What is the crystal structure of NaPb?
What is the density of NaPb?
How many polymorphs of NaPb are known?
What elements does NaPb contain?
Where does the data for NaPb come from?
How It Compares
As a unique binary intermetallic, NaPb serves as a foundational reference point for understanding the interplay between alkali metal reactivity and heavy p-block elements, providing a baseline for exploring the wider landscape of sodium-lead phase chemistry.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
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