Effects of crystallization atmospheres on the near-infrared absorbtion and electroconductive properties of tungsten bronze type M x W O 3 (M = Na, K)

Chongshen Guo, Shu Yin, Tsugio Sato

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1634-1639
Number of pages6
JournalJournal of the American Ceramic Society
Volume95
Issue number5
DOIs
Publication statusPublished - 2012 May 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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