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Effects of Crystallization Atmospheres on the Near‐Infrared Absorbtion and Electroconductive Properties of Tungsten Bronze Type MxWO3 (M = Na, K)

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The fine particles of tetragonal K x WO3 and cubic Na x WO3 were successfully synthesized by reducing WO4 2− with BH4 in aqueous solutions, followed by the crystallization of amorphous precursors by calcination under N2, NH3 and H2 (5 vol%)/N2 atmospheres at 600°C for 1 h, respectively. The products showed excellent electrical conductivity, visible light transparency, and near‐infrared light shielding characteristics, where the samples crystallized in H2 (5 vol%)/N2 mixed gas showed the highest electric conductivity being superior to commercial conductive oxide ITO. Meanwhile, the samples showed strong absorption of near‐infrared light and instantaneous conversion of photo‐energy to local heat. The effects of crystallization atmosphere on the near‐infrared absorbtion and electroconductivity properties of K x WO3 and Na x WO3 are discussed in detail.

Document Type: Research Article


Publication date: 2012-05-01

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