Cobalt is a ferromagnetic metal with a specific gravity of 8.9. The Curie temperature is 1,115 °C (2,039 °F) [12] and the magnetic moment is 1.6–1.7 Bohr magnetons per atom. [13] Cobalt has a relative permeability two-thirds that of iron. [14] Metallic cobalt occurs as two crystallographic structures: hcp and fcc. The ideal transition ...

2025年3月19日 · cobalt (Co), chemical element, ferromagnetic metal of Group 9 (VIIIb) of the periodic table, used especially for heat -resistant and magnetic alloys. The metal was isolated (c. 1735) by Swedish chemist Georg Brandt, though cobalt compounds had been used for centuries to impart a blue colour to glazes and ceramics.

2021年8月17日 · Cobalt has a melting point of 1495°C, boiling point of 2870°C, specific gravity of 8.9 (20°C), with a valence of 2 or 3. Cobalt is a hard, brittle metal. It is similar in appearance to iron and nickel. Cobalt has a magnetic permeability around 2/3 that of iron. Cobalt is found as a mixture of two allotropes over a wide temperature range.

Cobalt is transition metal and was discovered in pure form in 1735. It is essential part of vitamin B 12. Its compounds are known as cobalt blue used to color pottery and glass. History and Discovery. Cobalt has been used as a coloring agent since Bronze Age. It has been found in Egyptian statuettes and in Persian jewelry of the 3 rd millennium ...

2019年8月13日 · Cobalt is a shiny, brittle metal that is used to produce strong, corrosion and heat-resistant alloys, permanent magnets and hard metals. Silver-colored cobalt metal is brittle, has a high melting point and is valued for its wear resistance and ability to retain its strength at high temperatures.

Cobalt is the metal at the centre of vitamin B 12 which helps regulate cell development and therefore DNA and energy production in the body. Cobalt has been known and used by people for its beautiful colouring and pigment properties as far back as 2500BC.

Cobalt is used in alloys for aircraft engine parts and in alloys with corrosion/wear resistant uses. Cobalt is widely used in batteries and in electroplating. Cobalt salts are used to impart blue and green colors in glass and ceramics. Radioactive 60 Co is used in the treatment of cancer.

2023年4月30日 · Cobalt (Co) is a white, brittle, hard metal that is similar to nickel (and iron) in appearance but has a bluish tint rather than the yellow of nickel. Cobalt does not occur naturally as a free element.

Named from the German word meaning “goblin,” cobalt is a shiny, brittle, bluish-gray metal. It is a hard, stable metal unaffected by air or water and only slowly affected by acid. Cobalt is one of the three ferromagnetic metals, so it is often used in alloys for magnets.

Cobalt (pronunciation: KO-bolt) is a hard, lustrous silvery-blue element belonging to the group of transition metals, and it is represented by the chemical symbol Co [1, 2, 3]. It is chemically active and can form many compounds [4].