Tungsten Oxide of Bronzes Phase

Tungsten bronzes are a special class compounds which is non-stoichiometric and the chemical formula is MXWO3 (0 <X <1). The M of MXWO3 can be an alkali metal, calcium, strontium, barium, rare earth metals, copper, ammonium, hydrogen and so on. Such compounds are more exist in hexagonal, cubic and tetragonal, its structure is basis on WO6 octahedral structural, forming a layered having a six-membered, five- or four-membered ring channels through the apex of a rigid skeleton structure of tungsten oxide structure. Such compounds have special physical properties, which generally has a high electronic conductivity and faster ion transport properties, which conducts electricity can achieve 2.5 × 106Ω-1m-1, is a low-temperature superconductors. Recently it was widely used in electrochromic displays, electrode and PH sensors and other area, so then it becomes a hot issue again. Many methods for preparing tungsten oxide bronze, common in three ways: a solution of chemical reduction, electrochemical reduction, thermal reduction method.

 

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