Abstract
The effects of M (M=Zn and Ni) substitution for Cu on the microwave dielectric properties and the crystal structure of Yb2Ba(Cu1-xMx)O5 solid solutions were investigated. Yb2Ba(Cu1-xNix)O5 (x=0 to 1) solid solutions are a single phase, whereas the limit of Yb2Ba(Cu1-xZnx)O5 solid solutions is x=0.75. The formation of the solid solutions is caused by the difference of ionic radii between Yb3+ and M2+ ions. The εr values of Yb2Ba(Cu1-xZnx)O5 (x=0 to 0.75) solid solutions vary from 7.9 to 14.9, depending on the composition x. This variation is interpreted as an increase in the volume of the Yb2O11 polyhedron induced by an expansion of the bottom plane with M substitution for Cu. Moreover, the Q·f values of the solid solutions are extremely improved by M substitution for Cu, and the maximum Q·f values with Zn and Ni substitutions for Cu are 52815 and 50042 GHz, respectively.
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