Praseodymium Oxide, Praseodymia, 12037-29-5

Praseodymium Oxide, Praseodymia, 12037-29-5

🧪 Praseodymium(III,IV) Oxide (Pr₆O₁₁)

Praseodymium(III,IV) oxide, also known as Praseodymia, is a mixed-valence rare earth oxide containing both Pr³⁺ and Pr⁴⁺ ions. Its unique electronic structure gives it strong catalytic activity and distinctive coloring properties, making it valuable in ceramics, glass, and catalytic applications.

1️⃣ Chemical Identity

• Chemical Name: Praseodymium(III,IV) Oxide

• Formula: Pr₆O₁₁

• Molecular Weight: 1021.44 g/mol

• CAS Number: 12037-29-5

• EC Number: 234-857-9

• Appearance: Dark brown to black powder

• Crystal Structure: Cubic fluorite-related structure

• Density: ~6.7 g/cm³

• Melting Point: ~2,180 °C

• Solubility: Insoluble in water; reacts with acids to form praseodymium salts

2️⃣ Physical & Chemical Properties

• Mixed Valence: Contains both Pr³⁺ and Pr⁴⁺, enabling redox activity.

• Coloring Agent: Produces yellow to green hues in ceramics and glass.

• Catalytic Behavior: Oxygen storage and release capacity, similar to cerium oxide.

• Thermal Stability: High melting point and stability in oxidative environments.

3️⃣ Applications

• Glass & Ceramics:

  • Used as a coloring agent (yellow-green pigments).

  • Improves UV absorption in specialty glasses.

• Catalysis:

  • Oxygen storage material in automotive catalytic converters.

  • Redox catalyst in chemical processes.

• Electronics:

  • Potential applications in solid oxide fuel cells and mixed ionic-electronic conductors.

• Metallurgy:

  • Alloying additive for improving mechanical properties.

4️⃣ Synonyms

• Praseodymium Oxide

• Praseodymium(III,IV) Oxide

• Praseodymia

• Pr₆O₁₁

• Praseodymium Sesquioxide (sometimes misapplied)

5️⃣ Safety & Handling

• Toxicity: Low acute toxicity; fine powders may irritate eyes and respiratory tract.

• Precautions: Gloves, goggles, and dust masks recommended.

• Storage: Keep in dry, sealed containers; stable under normal conditions.

• Waste Disposal: Follow local environmental regulations for rare earth oxides.

📌 Summary: Praseodymium(III,IV) Oxide (CAS 12037-29-5) is a mixed-valence rare earth oxide with catalytic redox activity, coloring properties, and oxygen storage capacity, making it essential in glass, ceramics, catalysis, and advanced materials.