The surface of the earth is almost entirely composed of oxides. Over the centuries much effort has been expended to reduce these oxides to metals such as aluminium, copper, and iron. Metals can carry an electric current and are ductile, whereas oxides have generally been considered to be insulating and brittle. They remain brittle even at room temperature, except for a certain specially fabricated zirconium oxide. However as far as their electrical properties are concerned, there are actually many good conductors and in fact thallium-copper oxide shows superconductivity at temperatures as high as 125 K.
KeywordsSimple Metal High Doping Concentration Popular Research Theme Bloch Electron Crystalline Transformation
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