Abstract
The polarised i.r. reflectivity spectra of single crystals of the non-linear chalcopyrite materials ZnGeP 2 and CdGeP 2 have been measured over the spectral range 40–700 cm −1. Analysis of the spectra using classical dispersion theory and the Kramers-Krönig technique has yielded, in each material, five modes with frequencies between 80 and 385 cm −1 with the polarisation perpendicular to the optic axis. Parallel to the optic axis, two modes have been observed with frequencies between 300 and 400 cm −1. The phonon dispersion curves of the isoelectronic analogue GaP have been used, together with a group theoretical analysis, to assign specific atomic displacements to the observed modes.
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