Praseodymium carbonates, with their Pr3+ 4f2 electronic configuration and unique green light absorption characteristics, have become key precursors for the preparation of special glass colorants, praseodymium yellow pigments, and magnetic materials, with their thermal decomposition products, Pr6O11, possessing special oxidative catalytic activity.
Chemical properties
- Solubility: Slightly soluble in water ( solubility at 25℃ ≈ 0.003 g/100mL), soluble in dilute acids (HCl, HNO3) and evolves CO2 vigorously.
- Thermal behavior: DTA shows a double endothermic peak for dehydration (150-250℃) and decomposition (400-500℃).
- Acid-alkalinity: water suspension pH ≈ 6.0-7.0
- Optical properties: characteristic absorption peaks in the visible light region (444nm, 468nm, 482nm)
Application fields
Dyeing material
- Prym yellow pigment: Preparation of (Zr,Pr)SiO4Ceramic pigment (L* value > 90)
- Optical glass: UV cut filter additive (cut-off edge 420-450nm)
Functional ceramics
- Dielectric material: Pr-doped BaTiO3ceramics (dielectric constant > 5000)
- Magnetic materials: Preparation of precursor for Pr-Fe-B permanent magnet
Catalysis area
- Purification of automobile exhaust: Pr6O11/CeO2composite catalyst (30% increase in oxygen storage capacity)
- Methane reforming: Pr2O3-Ni/Al2O3catalyst components
Matters needing attention
- Moisture-proof packaging: needs to be sealed in a vacuum aluminum plastic bag.
- Store away from light: It is recommended to use amber glass containers.
- Temperature control: Storage temperature 15-30℃ for long term
- Isolation requirements: Store separately from strong acids, oxidizing agents.
