Pr
Praseodymium · Pr
Praseodymium is a soft, silvery, malleable, and ductile metal that is a member of the lanthanide series. It is primarily used as an alloying agent and as a component in specialized glass and magnet production.
Pr
Overview
Key Properties
Cross-validated computational properties for Praseodymium, 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.
Metallic / not reported
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.
0.008 eV/atom
Best (lowest) across sources
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.
Near hull (likely stable)
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
50
4 databases, 10 space groups
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of Pr. 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.
1.00 / 1.00
Trust tier: medium
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
0.000 eV
EAH spread across sources
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
2
jarvis, materials_project
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
All match
Crystallography
Reported Structures
Lowest-energy structures reported for Pr, 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. |
|---|---|---|---|---|---|
| Fm-3m (No. 225) | cubic | 0.00 | 0.0080 | -29.396 | 6.28 |
| P3121 (No. 152) | trigonal | 0.00 | 0.0083 | -29.396 | 6.41 |
| C2/m (No. 12) | monoclinic | 0.00 | 0.0097 | -29.394 | 6.49 |
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.0146 | -29.389 | 6.40 |
| R-3m (No. 166) | trigonal | 0.00 | 0.0228 | -29.381 | 6.37 |
| P3221 (No. 154) | trigonal | 0.00 | 0.0352 | -29.369 | 6.38 |
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.0458 | -29.358 | 6.32 |
| Cmcm (No. 63) | orthorhombic | 0.00 | 0.0469 | -29.357 | 6.33 |
| I4/mmm (No. 139) | tetragonal | 0.00 | 0.1124 | -29.292 | 6.44 |
| Im-3m (No. 229) | cubic | 0.00 | 0.1260 | -29.278 | 6.34 |
| Im-3m (No. 229) | Cubic | — | — | — | 6.77 |
| Fm-3m (No. 225) | — | — | — | — | — |
Synthesis
Synthesis Routes
Literature-extracted synthesis procedures targeting Pr.
Sol-Gel
Procedure available · ceder_solid_state
Uses
Applications
Where Praseodymium is used.
High-strength metal alloysPermanent magnetsGlass coloring and UV protectionCarbon arc lightingCatalysts
Reference
Frequently Asked Questions
Common questions about Praseodymium, answered from cross-validated data.
What is Pr?
Praseodymium is a soft, silvery, malleable, and ductile metal that is a member of the lanthanide series. It is primarily used as an alloying agent and as a component in specialized glass and magnet production.
More questions
What is Pr used for?
Praseodymium (Pr) is used in high-strength metal alloys, permanent magnets, glass coloring and UV protection, carbon arc lighting, and catalysts.
What is the band gap of Pr?
Praseodymium (Pr) is computed to be metallic (no band gap) in the reported DFT structures.
Is Pr a metal, semiconductor, or insulator?
Computed band structures report no gap, so it is metallic.
Is Pr thermodynamically stable?
Praseodymium (Pr) has a lowest energy above hull of 0.008 eV/atom (near hull (likely stable)).
What is the crystal structure of Pr?
The lowest-energy reported polymorph of Praseodymium (Pr) is cubic symmetry, space group Fm-3m (No. 225).
What is the density of Pr?
The computed density of the ground-state structure of Praseodymium (Pr) is 6.28 g/cm³.
How many polymorphs of Pr are known?
50 structures of Pr are reported across 4 databases, spanning 10 distinct space groups.
How is Pr synthesized?
Literature-reported routes for Pr include sol-gel.
What elements does Pr contain?
Praseodymium (Pr) contains Pr (1 element).
Where does the data for Pr come from?
Pr data is cross-referenced from materials_project, mpaloe, jarvis, cod.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
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