Germanium Oxide, Germanium Dioxide, 1310-53-8

Didymium Oxide, 11141-21-2

DIDYMIUM OXIDE (CAS 11141-21-2)
DIDYMIUM OXIDE / NEODYMIUM-PRASEODYMIUM OXIDE MIXTURE / MIXED RARE EARTH OXIDE
1. PRODUCT IDENTIFICATION AND CHEMICAL IDENTITY

2. CHEMICAL STRUCTURE
2.1. Molecular Structure
Didymium oxide is not a single element oxide but a mixture of neodymium oxide (Nd₂O₃) and praseodymium oxide (Pr₆O₁₁). Historically, the term "didymium" was used before these two elements were separated. The mixture ratio varies depending on the application. It exhibits strong absorption bands in the visible light spectrum, making it valuable for filter applications. It is insoluble in water but soluble in acids.

Structural Features:

                    DIDYMIUM OXIDE [Nd₂O₃ + Pr₆O₁₁]
                          |
                Nd₂O₃ + Pr₆O₁₁ Mixture
                          |
        +----------------+----------------+
        |                |                |
    Brown             Strong Optical     Soluble in
    Powder Form       Absorption         Acids
    (Reddish Tones)

2.2. Structural Properties

3. PHYSICAL AND CHEMICAL PROPERTIES

4. TYPICAL COMPOSITION (VARIANT DEPENDENT)

5. STABILITY AND REACTIVITY

5.1. Chemical Reactions

• Reaction with Acids:
  Nd₂O₃ + 6HCl → 2NdCl₃ + 3H₂O
  Pr₆O₁₁ + 18HCl → 6PrCl₃ + Cl₂↑ + 9H₂O

6. APPLICATION AREAS
6.1. Glass Industry

6.2. Electronics

6.3. Metallurgy

6.4. Textile

6.5. Carbon Arc Lamps

6.6. Sectoral Suitability Table

7. PRODUCTION PROCESS

7.1. Major Producing Countries

8. ALTERNATIVE / SUBSTITUTE PRODUCTS

9. SAFETY AND TOXICOLOGY

9.1. GHS Classification

Signal Word: WARNING

Hazard Pictograms: GHS07 (Exclamation Mark)

10. STORAGE AND SHELF LIFE

11. QUICK REFERENCE TABLE

12. CRITICAL WARNINGS AND BEST PRACTICES

CRITICAL WARNINGS:

• Mixture Product: Didymium oxide is not a single element compound but a mixture of neodymium and praseodymium oxides. Composition ratios vary by manufacturer and application.

• Optical Properties: Valued for optical filters and welder's goggles due to strong absorption bands in visible light.

• Historical Name: "Didymium" is a historical term used before neodymium and praseodymium were separated; it is still used commercially today.

• Compatibility: Used in glass coloring and decolorizing applications to neutralize iron impurities.

• Storage: Storage at 2-8°C is recommended; protect from moisture and CO₂ absorption.

BEST PRACTICE RECOMMENDATIONS:

• Storage:

  • Store in a cool, dry, and well-ventilated area or at 2-8°C.

  • Use moisture-proof, tightly closed containers.

  • Keep away from acids and oxidizing agents.

• Handling:

  • Use in well-ventilated areas with local exhaust ventilation.

  • Use a dust mask (N95 or better), protective goggles, and gloves.

  • Avoid dust formation and inhalation.

  • Wash hands thoroughly after handling.

• Waste Management:

  • Dispose of in accordance with local regulations.

  • Do not discharge into water sources.

  • For large quantities, rare earth recovery should be considered.

LEGAL DISCLAIMER
This Technical Data Sheet (TDS) is for informational purposes only and has been prepared based on available technical data. The user is solely responsible for determining the suitability of the product for their specific applications and for complying with all local, national, and international regulations. For complete safety, storage, handling, transport, disposal, and regulatory compliance information, the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier must be consulted. This document does not substitute professional advice. Didymium oxide is a commercial rare earth product used in glass, optical, and electronic applications as a mixture of neodymium and praseodymium oxides; composition ratios may vary depending on the application.