Abstract
The transmittance and reflectance spectra of PbTe films grown on different substrates (KBr, KCl, ${\mathrm{BaF}}_{2}$) by the nonequilibrium growth technique of laser-assisted deposition are investigated. The films represent two-layer structures: the sublayer, adjacent to the substrate, consists of the high-pressure metastable CeCl-type phase while the upper sublayer is of the stable fcc phase. As the metastable-CeCl-type-phase lattice volume depends on the substrate nature, we investigate PbTe films with CsCl-type phase corresponding to different pressures. The optical energy gaps in the various films are determined from the maxima in the refractive index dispersions, calculated from the transmittance and reflectance spectra. Thus, the energy-gap pressure coefficient in the PbTe CsCl-type metastable phase is obtained.
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