Cesium Tungsten Bronze Applied for Sunroom Thermal Insulating Coating

Cesium tungsten bronze is often used to prepare an environmentally friendly sunroom thermal insulating coating without containing poisonous and harmful substances. According to the experts, cesium tungsten bronze is a type of tungsten bronze structure material MxWO3 with the formula of CsxWO3. And the CsxWO3 nanopowder possesses mixed valence state of tungsten (W5+ and W6+). Their crystal structure changes with their different x values.

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In the case of the large size ion, such as Cs+ ions (ionic radius, r = 0.167 nm), in principle, only the maximum value of x = 0.33 of Cs+ ions can be introduced into the hexagonal structure. With the decrement of the ionic radii, if some smaller ions such as Li+(0.076 nm), Na+(0.102 nm), K+(0.138 nm), Rb+(0.152 nm) are utilized to instead of bigger ions of Cs+, the distortion of the MxWO3 crystal will occur. As a result, the shrinkage of the tunnel structure occurs and leads to the formation of tetragonal and cubic structures.

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