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Dielectric Studies of Some Indian Granite Samples

A.Suresh and G. Sathaiah

Granite samples were collected from various places of South India. Chemical analysis of these granite samples were investigated using X-ray fluorescence spectroscopy. The major contents observed are SiO2, Al2O3 and Fe2O3. Larger grain size is observed in FESEM micrographs. This indicates longer time grown granites. Measurement of dielectric constant (ε) and loss (tanδ) have been carriedout on granite samples as a function of frequency from 1Hz to 5MHz and temperature from300K to 725K. An effective and alternate approach is adopted for investigating dielectric relaxationbehaviour viz. electric modulus spectroscopy. This includes fitting of dielectric response to Bergmann frequency domain function. The average activation energiesevaluated from these fitsare E1=0.34eV and E2=0.51eV. The results are discussed.