Abstract
Abstract The optical transmissivity of potassium iodate (KIO3) single crystals was measured from the ultraviolet to the infrared range. By using the results in the visible range, the wavelength dependence of the absorption coefficient α and its root (α - hv, α1/2 - hv) were calculated and the characteristics of the absorption edge were discussed. The forbidden energy gap Eg of the crystals, which corresponds to intrinsic absorption related to direct transitions, is 4.13 eV, slightly higher than that reported in the literature. The absorption edge below 4.13 eV is attributable to the indirect transition. The energy gap E'g (3.88 eV) corresponding to the indirect transition, and the energy Ep (806.7 cm−1) of phonons taking part in the indirect transition at room temperature were calculated from the α1–2 - hv curve. The latter was verified from the Raman spectrum of the crystals.
Published Version
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