Canadian Journal of Pure & Applied Sciences

Abstract: Dielectric properties of some edible and medicinal oils have been studied at 455 KHz, 9.1 GHz and optical frequency for the temperature range of 2930K to 323OK. It has been observed that the dielectric constant at optical frequency (?oe) is almost same for all oil samples where as variation in dielectric permittivity (?’) is more prominent at lower frequencies for pure oils. The static dielectric constant (?0) and dielectric constant at optical frequency (?oe) decrease slightly with increase in temperature for all the oil samples. Dielectric permittivity (?’) and loss tangent (tan ?) of different oil samples at 9.1 GHz show some interesting behaviour at particular temperature. The macroscopic relaxation time ( ?m) and molar free energy of activation (?F?) is also determined which show systematic variation with temperature for most of the oil samples under consideration.