CdS nanocrystals in the powder form were successfully prepared using sonochemistry method. Structural and morphological characterizations of as prepared samples were done by means of X-ray powder diffractometer (XRD) and Scanning electron microscopy (SEM). The results show that spherical nanocrystallites were formed with a mean size of about 5nm in cubic structure. The nanopowders were embedded into PVA matrix and some dielectric properties of CdS-PVA nanocomposites were characterized using Impedance spectroscopy technique. Detailed studies of dielectric and impedance spectroscopy studies of CdS-PVA nanocomposites in a wide range of frequency (1kHz-1MHz) and temperatures (298K- 423K) show that these properties are strongly temperature and frequency dependent. The change of dipole orientation and charge migration, porosity of polymer structure and space charge carriers plays an important role in relaxation mechanisms and conduction process.

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