The most common type of tungsten bronze is sodium tungsten bronze, which has a metallic luster, and its color varies with the value of x, ranging from golden yellow to light blue-gray, for example, NaWO3 is golden yellow, and Na0.67WO3 is magenta , Na0.5WO3 is purple, and Na0.2WO3 is blue. When the ratio of Na:WO3 is greater than 0.3, its temperature coefficient of resistance is positive, extremely unstable, and has semi-metallic properties; when it is less than 0.3, it is negative and is a semiconductor.
All tungsten bronzes are extremely inert in nature, semi-metallic, metallic and electrically conductive. Their chemical inertness is manifested in their insolubility in water and resistance to all acids except hydrofluoric acid. But they can reduce silver nitrate from its ammonia solution to silver metal, and in the presence of alkali, they can be oxidized by oxygen to tungsten (VI) salt. For their semiconductor properties, it can be considered that all tungsten atoms in them are W(Ⅵ), and the valence electrons of metallic sodium move freely in the lattice of tungsten bronze just like in metallic sodium. Lithium also forms tungsten bronze, but it does not conduct electricity.
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