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We present a parametric dielectric function model in depen‐ dence of the intercalated charge per tungsten ion ratio x, which excellently describes the ellipsometric experimental data, and allows the identification of two polaron modes corresponding to transitions between W4+ and W5+ and between W5+ and W6+ tungsten ion sites. A competitive relation between the two polaron transitions is found. An empirical relation for the amplitude of the polaron transitions is found useful to provide a good description of the polaron transition dependence on x. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Saenger et al. (2008) studied this question.
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