Dielectric behavior of SrTiO3 and YiBa(2)Cu(3)O(x) at 10.6 GHz using a microwave resonant cavity as a probe

A cylindrical microwave resonant cavity operating in the TE011 mode was use d to study the dielectric response of SrTiO3 and YiBa(2)CU(3)O(x). The micr owave dielectric response of the powdered samples of these materials is stu died as a function of temperature at a frequency of 10.6 GHz. For this stud y, a very precise heating and cooling system was designed to control the te mperature accurately to a tenth of a degree. The real and imaginary parts o f the complex: permittivity were studied using Slater's Perturbation equati ons. The relaxation times of these materials are derived using Debye's equa tions for polar molecules.