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Co

Cobalt is a hard, lustrous, silver-grey metal, a chemical element with symbol Co. It is found in various ores, and is used in the preparation of magnetic, wear-resistant, and high-strength alloys. Its compounds are used in the production of inks, paints, and varnishes.

Cobalt is a silver or gray ferromagnetic metal. Pure cobalt is not found in nature, but compounds of cobalt occur naturally in many forms. Small amounts of it are found in most rocks, soil, water, plants, and animals. It is an element of atomic number 27. The Curie temperature is of 1388 K with 1.6~1.7 Bohr magnetons per atom. In nature, it is frequently associated with nickel, and both are characteristic ingredients of meteoric iron. Mammals require small amounts of cobalt which is the basis of vitamin B12. Cobalt-60, an artificially produced radioactive isotope of cobalt, is an important radioactive tracer and cancer-treatment agent. Cobalt has a relative permeability two thirds that of iron. Metallic cobalt commonly presents a mixture of two crystallographic structures hcp and fcc with a transition temperature hcp→fcc of 722 K. Cobalt has a hardness of 5.5 on the Mohs scale of mineral hardness.

Common oxidation states of cobalt include +2 and +3, although compounds with oxidation state +1 are also well developed。

TECHNICAL DATA
SymbolCoMelting point/ °C1495
Atomic number27Boiling point/ °C3100
No. of naturally occurring isotopes1ΔHfus/kJmol-116.3
Atomic weight58.9332ΔHvap/kJmol-1382
Electronic configuration[Ar]3d74s2ΔHf(monoatomic gas)/kJmol-1425 (+/-17)
Metal radius(12-coordinate)/pm125Electrical resistivity
Ionic radius(6-coordinaie)/pm TV53(20°C)/ μohm cm6.24
Ionic radius(6-coordinatc)/pm III54.5(ls),61(hs)Electronegativity χ1.8
Ionic radius) 6-coordinate)/pm II65(ls).74.5(hs)(Is = low spin, hs = high spin)
Density (20°C)/gcm-38.9

EVAPORATION TECHNIQUES
Temperature (oC) @Vap. PressureTechniquesRemarks
10-8 Torr10-6 Torr10-4 TorrElectron BeamCrucibleCoilBoat
8509901200ExcellentAl2O3-Tungsten & NiobiumAlloys with refractory metals.



Co
Sputtering Targets
Matierial SymbolAtomic Number     Thermal Conductivity         Theoretical Density 
W/m.K           g/cc
Cobalt_Co Co271008.9
Evaporation Materials
Matierial SymbolAtomic Number     Thermal Conductivity         Theoretical Density 
W/m.Kg/cc
Co ( pellets ) Co271008.9


Below is the periodic table of chemical elements。The elements in red are the ones Nexteck's product contain。 Click them, you will come to the details。

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