The first capacitor was invented in 1745 - the Leyden Jar. It was composed of two conductors with an insulator between them. Many developments have been carried out on these three components. At present, the most usual dielectric components are ceramic materials (barium titanate, aluminium oxide and tantalum oxide) and film. Recently research has been carried out on niobium, as a valve metal, as a metal for the manufacture of 'solid' electrolytic capacitors. Several companies have already supplied samples for performance testing, and some industrial production and sales have already taken place. This paper discusses CBMM's recent advances in the manufacture of high quality niobium metal and niobium monoxide powder. Furthermore, the manufacture of niobium metal wire for capacitor applications is discussed and presented.
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