Cobalt (II,III) Oxide Co3O4

Other Names: Cobalt oxide, Cobaltosic oxide, Cobalt(II,III) oxide
Chemical Formula: Co₃O₄
Molar Mass: 240.80 g/mol
CAS Number: 1308-06-1
Appearance: Black to dark gray powder
Odor: Odorless

Cobalt oxide is a high-performance inorganic compound valued for its thermal stability, catalytic activity, and ceramic coloring properties. It is widely used in industrial and technical applications, including ceramics, pigments, catalysts, battery materials, and specialty coatings.

Chemical and Physical Properties

• Density: ~6.11 g/cm³
• Melting Point: decomposes at high temperature
• Solubility: Insoluble in water; soluble in strong acids
• Crystal Structure: Spinel
• Color: Black to dark gray
• Thermal Stability: High thermal stability under normal use conditions
• Magnetic Properties: Weakly magnetic behavior typical for mixed cobalt oxides

Applications

• Ceramics: Used as a colorant in ceramic glazes, enamels, and glass formulations

• Pigments: Applied in the production of black, gray, and blue-toned inorganic pigment systems

• Catalysts: Used in chemical processes as a catalyst or catalyst support component

• Battery Materials: Utilized in the manufacture of technical electrode and energy-storage materials

• Refractory and Technical Materials: Added to specialty formulations requiring thermal resistance and chemical durability

• Coatings: Used in selected industrial coating and surface treatment systems

Safety

Cobalt oxide is generally treated as a hazardous chemical substance and should be handled with appropriate care. Fine powder may pose a risk if inhaled, swallowed, or brought into prolonged contact with skin. Safety classification may vary depending on particle size, purity, and supplier-specific data. Always refer to the current Safety Data Sheet before use.

First Aid

Inhalation: Move the affected person to fresh air. Seek medical advice if symptoms occur.

Skin Contact: Wash thoroughly with soap and water. Remove contaminated clothing. Seek medical attention if irritation develops.

Eye Contact: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing. Seek medical advice if irritation persists.

Ingestion: Rinse mouth. Do not induce vomiting unless instructed by medical personnel. Seek medical attention.

Handling and Storage

Handling: Avoid generating or inhaling dust. Use with adequate ventilation or local exhaust. Wear suitable protective gloves, protective clothing, and eye protection when handling powder.

Storage: Store in a tightly closed container in a dry, cool, and well-ventilated place. Keep away from incompatible materials such as strong acids. Protect from moisture and contamination.

Environmental Considerations

Do not release large amounts of powder into drains, soil, or water systems. Dispose of contents and container in accordance with local regulations. Environmental precautions should be applied especially when handling fine particulate material.