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Cobalt is a chemical element with symbol Co and atomic number 27. Like nickel, cobalt is found in the Earth's crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. Cobalt is a ferromagnetic metal with a specific gravity of 8.9. The Curie temperature is 1,115 °C (2,039 °F) and the magnetic moment is 1.6–1.7 Bohr magnetons per atom. Cobalt has a relative permeability two-thirds that of iron.
Cobalt with a purity of 99.9-99.99% has been widely used in the manufacture of magnetic materials and superalloys, and cobalt sputtering targets with 99.999% or higher purity are applied for advanced electronic components. The high-purity cobalt sputtering targets manufactured by Xinkang is mainly used in magnetic recording, magnetic sensor and photoelectric fileds