Microwave dielectric properties of Y2Ba(Cu1-xZnx)O5 solid solutions

The microwave dielectric properties of Y2Ba(Cu1-xZnx)O-5(0 less than or equal to x less than or equal to 1) solid solutions, prepared by the solid state reaction method, were studied in relation to the amount of Zn substitutions, and measured using the Hakki and Coleman method. The epsilon(r) and the tau(f) increased slightly, and the Q.f values changed nonlinearly as the amount of Zn substitution was increased. In particular, it is shown that improved microwave dielectric properties with Q.f = 110665 GHz; epsilon(r) = 14.2 and epsilon(f) = -41.5 ppm/degrees C are obtained for samples with x = 0.5, which also have few pores and high relative density. Thus, it was concluded that the Q.f values were closely related to the presence of pores in the samples.