Measurement and analysis of dielectric properties of 4 – phenoxy benzophenone at microwave frequency range

The study of organic compounds such as 4 – phenoxy benzophenone has important role as a photosensitizing agent and a plant metabolite related to dielectric behaviour from microwave absorption is of great value. The dielectric parameters are generally dependent on frequency, temperature, packing density and other factors such as material structure and composition. The behaviour of dielectric substance4-Phenoxy benzophenoneis changed by the application of external electric field. The important concept in dielectric theory is that of an electric dipole moment which is measure of electrostatic effect of a pair of opposite charges separated by a finite distance. The present paper examines the effect of packing density and temperature on dielectric parameters of 4-Phenoxybenzophenone. The wave guide cell was designed for holding 4-Phenoxybenzophenone sample in the form of powder. The reflectometric technique was used for the measurement of dielectric constant and loss factor. Measurement of 4-Phenoxybenzophenone powders of different packing fractions at 9.85 GHz microwave frequency are reported. The results indicate that, the values of dielectric constant (ε֝p), dielectric loss (ε֕p), relaxation time (τp) and conductivity (σp), increases with the increase of relative packing fraction (δr) 0.9501, 0.9685, 1.000, and decreases with the increase in temperature 150c, 250c to 600c. The experimental values have been used to obtain transformation to 100% solid bulk, using co-relation formulae of Landu-Lifshitz, Looyanga and Bottcher. The results show that there is a fair agreement between the experimental and theoretical values of dielectric constant and dielectric loss.