Bismuth is a brittle metal with a white, silver-pink hue, often occurring in its native form with an iridescent oxide tarnish showing many refractive colors from yellow to blue.
Rare earth materials are often sold at 99.99% purity when in fact they are of lower unknown purity because the testing capability of Chinese production facilities can only determine the purity of a specific rare earth to the other rare earths in the compound.
Debismuthizing of lead bullion by (a) fractional crystallization, (b) electrolytic (Betts) refining, or (c) addition of calcium or magnesium (Betterton-Kroll process) which removes bismuth.
The free element is 86% as dense as lead. It is a brittle metal with a silvery white color when newly made, but often seen in air with a pink tinge owing to the surface oxide.
High purity bismuth is used for synthesis of a wide variety of substances (pharmaceutical products, high temperature superconductive ceramics, oxide crystals), as well as low-melting alloys. It is also used for preparation of compound semiconductor, high purity alloys, electronic cooling components, thermoelectric conversion elements and atomic screening of the heap carrier of liquid cooling. Bismuth metal has been known from ancient times, although until the 18th century it was often confused with lead and tin, which each have some of the metal's bulk physical properties.
Hazard: Flammable in powder form.
Read more>> Natural Mineral Salts
No comments:
Post a Comment