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12 December 1989 Anomalous Electrochromic Behavior Of Ag-WO3 And Au-WO3 Cermets
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Optical and electrochromic properties of Ag-WO3 and Au-WO3 cermets with different metal filling factors are presented. The two cermet systems show entirely different optical properties which have been examined in the light of Maxwell-Garnett theory. Under low density lithium ion insertion these systems exhibit normal electrochromic coloration with the formation of tungsten bronze (LixW03). However, beyond a certain threshold density of lithium ion insertion these systems show an anomalous behavior in the optical properties. This behavior seems to be originating from the irreversible formation of lithium tungstate (Li2W04).
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P. V. Ashrit, G. Bader, Fernand E. Girouard, and Vo-Van Truong "Anomalous Electrochromic Behavior Of Ag-WO3 And Au-WO3 Cermets", Proc. SPIE 1149, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VIII, (12 December 1989);

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