Cesium Tungstate Applied for Heat Insulation Window Glass

Cesium tungstate for producing heat insulation window glass is cesium tungstate nanopowder - a near-infrared absorbing material that can exert excellent heat shielding function. Also, cesium tungstate nano powder is an anti-ultraviolet material that can shield most of the ultraviolet radiation.

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Cesium tungstate, or Cs0.33WO3, is an interesting material, which can be thermal-decomposed form cesium peroxo-polytungstate. It is reported that thermal decomposition of cesium peroxo-polytungstate, an amorphous precursor, yielded not only pyrochlore-type, but also hexagonal WO3-type cesium tungstate, depending on the Cs/W ratio (x) in the precursors; the former is in the range 0.48≤x≤0.54 and the latter 0.30≤x≤0.34. Mixtures of these two phases were formed in the intermediate region of x. On reduction at 700 °C, the pyrochlore phase gave a compound with the same framework, with its cubic cell parameter being elongated from 10.25 to 10.32 Å, but reoxidation resulted in a mixture of pyrochlore and hexagonal phases. In contrast, reduction and oxidation of the hexagonal phase at 600°C was reversible.

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