Cobalt metal

CharacteristicCobalt is a ferromagnetic metal with silvery white the surface is silvery white, slightly pale pink, is located in the fourth cycle in the periodic table, the first Ⅷ, atomic number 27, close the six-party crystals, common valence is + 2, + 3.Cobalt is a shiny steel-gray metal, hard and brittle, ferromagnetic, when heated to 1150℃ magnetic disappear.Cobalt has valences of +2 and +3.At normal temperature, it does not work with water or air and is similar to iron and nickel.Phase at STP:solidAppearance:hard lustrous bluish gray metalMelting point:1768 K (1495 °C, 2723 °F)Boiling point:3200 K (2927 °C, 5301 °F)Density (near r.t.):8.90 g/cm3when liquid (at m.p.):8.86 g/cm3Heat of fusion:16.06 kJ/molHeat of vaporization:377 kJ/molMolar heat capacity:24.81 J/(mol·K)ApplicationCobalt is primarily used in lithium-ion batteries, and in the manufacture of magnetic, wear-resistant and high-strength alloys. The compounds cobalt silicate and cobalt(II) aluminate (CoAl2O4, cobalt blue) give a distinctive deep blue color to glass, ceramics, inks, paints and varnishes. Cobalt occurs naturally as only one stable isotope, cobalt-59. Cobalt-60 is a commercially important radioisotope, used as a radioactive tracer and for the production of high-energy gamma rays.