The reflective and absorptive contributions to the optical modulation in sputter-deposited thin films of crystalline LixWO3 have been determined as a function of lithium concentration (0<x<0.5). The magnitude of the reflective response increases with increasing substrate temperature (Ts) during deposition for Ts≤466 °C. For Ts>466 °C, the reflective component decreases. The lithium concentration dependence of the absorption coefficients supports the hypothesis that absorption in crystalline LixWO3 arises from free-electron scattering.
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Cogan et al. (1986) studied this question.
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