Used as a coloring agent in ceramics and glass to produce deep blue hues. Commonly employed in the production of pigments for paints, plastics, and tiles due to its stability at high temperatures. Acts as a catalyst in industrial processes such as desulfurization and hydrocarbon oxidation. Utilized in the manufacture of lithium-ion battery materials and in the synthesis of other cobalt-containing compounds. Also found in some solid-state sensors and electronic ceramics.