Photoacoustic characterization of chalcogenide glasses: Thermal diffusivity ofGexTe1−x

The photoacoustic technique is used to investigate the thermal diffusivity of ${\mathrm{Ge}}_{\mathit{x}}$${\mathrm{Te}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ glasses as a function of composition. The observed dependence on the composition is explained on the basis of the chemically ordered network model. This interpretation is further supported by x-ray and electrical resistivity measurements.