Tungsten alloys have three kinds of types, tungsten-molybdenum alloys, niobium-tungsten alloys and hard alloys according to different added elements. Tungsten-Molybdenum Alloy is an alloy containing molybdenum and tungsten, which includes two series of molybdenum-tungsten alloy with molybdenum as the main additive element and tungsten-molybdenum alloy with tungsten as the main additive element. The two alloys can be formed in any ratio and are completely solid solution alloys at many temperatures.

The nominal compositions of commonly used Molybdenum-Tungsten Alloy are Mo-30W, Mo-50W and Mo-85W.The Mo-W alloy can be regarded as a transition alloy between Mo and W. Therefore, the alloy can be applied in a wide temperature range between molybdenum and tungsten.

Tungsten trioxide (WO3) powder has been used to produce filaments and tungsten carbide. As more characteristics are discovered, WO3 powder has been widely used in electrochromic displays, semiconductor gas sensors, photocatalysts and other devices due to its excellent electrochromic, gastrochromic, thermochromic and photochromic properties. WO3 powders with nanostructures are believed to have the enhanced properties because of their larger surface area and unique physical properties.

Tungsten trioxide (WO3) is an N-type semiconductor material that has been widely studied for use in sensors, electrochromism, photocatalysts, and energy storage devices. A simple and low-cost microwave-assisted method have been adopted to prepare the composite.