![]() The metal is employed to form numerous alloys with other metals. It has unusual electrical, thermal, optical, and solid-state properties that have not been fully investigated. Neither zinc nor zirconium is ferromagnetic but ZrZn 2 exhibits ferromagnetism at temperatures below 35°K. It is a fair conductor of electricity, and burns in air at high red heat with evolution of white clouds of the oxide. It is brittle at ordinary temperatures but malleable at 100 to 150☌. Sixteen other unstable isotopes are recognized. Naturally occurring zinc contains five stable isotopes. One method of zinc extraction involves roasting its ores to form the oxide and reducing the oxide with coal or carbon, with subsequent distillation of the metal. The principal ores of zinc are sphalerite (sulfide), smithsonite (carbonate), calamine (silicate), and franklinite (zinc, manganese, iron oxide). He demonstrated that zinc could be obtained by reducing calamine with charcoal. The metal was rediscovered in Europe by Marggraf in 1746. India by reducing calamine with organic substances such as wool. Metallic zinc was produced in the 13th century A.D. An alloy containing 87 percent zinc has been found in prehistoric ruins in Transylvania. Centuries before zinc was recognized as a distinct element, zinc ores were used for making brass. Because of its corrosion resistance, zinc is often plated to other metals in a process called galvanization galvanized roofing shown here.įrom the German word Zink, of obscure origin.
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