TY - JOUR
T1 - Effects of crystallization atmospheres on the near-infrared absorbtion and electroconductive properties of tungsten bronze type M x W O 3 (M = Na, K)
AU - Guo, Chongshen
AU - Yin, Shu
AU - Sato, Tsugio
PY - 2012/5/1
Y1 - 2012/5/1
N2 - The fine particles of tetragonal K xWO 3 and cubic Na xWO 3 were successfully synthesized by reducing WO 4 2- with BH 4 - in aqueous solutions, followed by the crystallization of amorphous precursors by calcination under N 2, NH 3 and H 2 (5 vol%)/N 2 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 H 2 (5 vol%)/N 2 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 xWO 3 and Na xWO 3 are discussed in detail.
AB - The fine particles of tetragonal K xWO 3 and cubic Na xWO 3 were successfully synthesized by reducing WO 4 2- with BH 4 - in aqueous solutions, followed by the crystallization of amorphous precursors by calcination under N 2, NH 3 and H 2 (5 vol%)/N 2 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 H 2 (5 vol%)/N 2 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 xWO 3 and Na xWO 3 are discussed in detail.
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U2 - 10.1111/j.1551-2916.2011.05039.x
DO - 10.1111/j.1551-2916.2011.05039.x
M3 - Article
AN - SCOPUS:84862798500
VL - 95
SP - 1634
EP - 1639
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 5
ER -