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The Correlations of Electrochromism and Thermochromism of Tungsten Oxide Films Studied by Slow Positron Beam

Electrochromic (EC) and thermochromic (TC) tungsten oxide (WO3) films, deposited by magnetron sputtering and vacuum thermal evaporation, were studied systematically by means of slow positron measurements. The S parameters of colored amorphous WO3 film and crystalline WO3 film behaved quite similarly in the processes of thermochromism and electrochromism, little influenced by the different deposition methods. It indicates that the coloration processes under various external conditions are correlated with each other. It also shows that the slow positron beam technique may play a particular role in the study of chromogenic materials.