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The diffuse reflection spectroscopy (DRS) method was used to study the properties
of strontium bismuthate Sr3Bi2O6 in a wide temperature
range. It is established that after the
Kubelka-Munk transformation and logarithmization, it is possible to distinguish three linear
sections on the DRS. The presence of such linear regions at energies smaller than the bandgap
is usually associated with electron-phonon interactions in the crystal and is described using a
model based on the Urbach rule. A high-energy linear region can be associated with a direct
transition of electrons from the valence band to the conduction band. The remaining linear
sections can be associated with the transfer into the conduction band of electrons
biographically localized in deep traps in the bandgap.
Keywords: strontium bismuthate, temperature dependence of diffuse reflection spectra, Urbach rule, Urbach energy, electron-phonon interactions |
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