Dielectric properties of nanophase Ag2HgI4 and Ag2HgI4-Al2O3 nanocomposites

The dielectric properties of nanophase Ag2HgI4 and Ag2HgI4-Al2O3, nanocomposites at different frequencies have been studied over a temperature range covering the stability range of beta phase of Ag2HgI4 and beyond the beta to alpha phase transition temperature. epsilon', tan delta and sigma(a.c.) of nanophase Ag2HgI4 and Ag2HgI4-AI(2)O(3) nanocomposites were found to be larger than the reported values for polycrystalline pellets of Ag2HgI4, The dielectric properties of the nanocomposites were found to be a function of the wt,% of nano alumina, The observed changes are attributed to the grain boundary properties of nanophase materials and to the microsize space charge effects.