Abstract
Reflection spectra of Ba 1−xK xBiO 3 over a wide spectral range are reported. For x lower than the critical value of ∼ 0.35 contributions of free carriers, interband transitions and midgap absorption processes are observed. The plasma frequency is small (< 0.1 eV) for all x below the insulator to metal transition. Increasing x from 0 to ∼ 0.1 results in a transfer of oscillator strength from the interband maximum to a midgap maximum. For x = 0.3 a flat plasma edge is observed, which is deformed by remainders of both the interband and midgap maxima.
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