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14 October 1997 Electrochromic praseodymium oxide films
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Thin films of Pr oxide were made by dc magnetron sputtering at different oxygen contents in the plasma. Films, ranging in color from dark orange (presumably PrO2-like) to transparent, were made by varying the O2/Ar ratio from 0.025 to 0.005. The electrochromic properties were studied under Li ion and proton intercalation. The charge capacity ranged from being comparable to that of W oxide for oxygen rich films to virtually zero for oxygen depleted films. The initially dark films showed strong anodic electrochromism and gave a rather neutral optical appearance in a device incorporating a W oxide film.
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Lisen Kullman, Andris Azens, and Claes-Goeran Granqvist "Electrochromic praseodymium oxide films", Proc. SPIE 3138, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XV, (14 October 1997);

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