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Cobalt Oxide

Updated: 2026-07-31

Overview

Cobalt oxide (CoO) is a versatile inorganic compound primarily used in industrial applications. It exists as a gray-to-black crystalline powder and is a key precursor for other cobalt compounds. The material is valued for its thermal stability and magnetic properties. As a transition metal oxide, cobalt oxide plays a crucial role in multiple industries. Its production typically involves thermal decomposition of cobalt salts or reduction of cobalt(III) oxide. The compound's consistent quality makes it essential for manufacturers requiring precise material characteristics.

Physical and Chemical Properties

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Cobalt oxide exhibits a cubic crystal structure (rock salt type) with a high melting point of 1,933°C. Its density of 6.45 g/cm³ makes it significantly heavier than water. The compound is insoluble in water but dissolves in mineral acids, forming cobalt salts. Chemically, CoO behaves as a basic oxide, reacting with acids to form cobalt(II) salts. It demonstrates antiferromagnetic properties below 291 K, which is important for certain electronic applications. The material's stability under normal conditions makes it suitable for long-term storage when properly handled.

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Main Applications

In the ceramics industry, cobalt oxide serves as a blue coloring agent for porcelain and glass. It produces distinctive blue hues in glazes and is valued for its color consistency. The compound's thermal stability ensures color retention during firing processes. The battery industry utilizes cobalt oxide in lithium-ion battery cathodes, particularly in the form of lithium cobalt oxide (LiCoO₂). Additionally, it functions as a catalyst in petroleum refining and chemical synthesis. Other applications include use in magnetic materials, semiconductors, and as an additive in animal feed (in regulated quantities).

Safety and Storage

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Cobalt oxide requires careful handling due to potential health risks. Inhalation of dust may cause respiratory irritation, while ingestion can lead to cobalt poisoning. Appropriate PPE (gloves, goggles, respirators) should be used when handling the powder form. Storage should be in tightly sealed containers in dry, well-ventilated areas away from acids and strong oxidizers. The material is not flammable but may decompose at high temperatures, releasing cobalt fumes. Spills should be contained and cleaned by trained personnel following local regulations.

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B2B Procurement Guide

When procuring cobalt oxide, buyers should specify purity requirements (typically 99% or higher for industrial applications). Technical grade (98-99%) is common for ceramic applications, while battery-grade material requires higher purity (99.5%+). Key procurement considerations include verifying supplier certifications (such as ISO 9001), requesting material safety data sheets (MSDS), and evaluating batch consistency. Large-volume buyers may negotiate pricing, especially for contracts with regular deliveries. Due to cobalt's status as a critical mineral, buyers should stay informed about market trends and potential supply chain disruptions.

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