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Tungsten trioxide (WO 3 ) films prepared by spray pyrolysis at various temperatures and on various SnO 2 :F substrates were investigated by means of X-ray diffraction and the results correlated to the electrochromic behaviour of the films. Films deposited onto polycrystalline SnO 2 :F films at a substrate temperature of 420 degrees C showed an electrochromic transmittance change of 90% in the near infrared. This strong colouration was associated with a randomly oriented film structure and a large crystallite size of the WO 3 films.
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Guanghui et al. (1988) studied this question.
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