Abstract
The effects of M substitution for Mg and Sb substitution for Nb in the (Mg 4− x M x )(Nb 2− y Sb y )O 9 ( M=Zn and Ni) ( x=0–2, y=0–1.5) solid solutions on the microwave dielectric properties were investigated in this study. The limits of both (Mg 4− x M x )Nb 2O 9 ( M=Zn and Ni) solid solutions were approximately x=2, whereas that of Mg 4(Nb 2− y Sb y )O 9 solid solutions was approximately y=1.5. As for the Ni and Zn substitutions for Mg, the quality factor, Q· f values of the (Mg 4− x M x )Nb 2O 9 ( M=Zn and Ni) solid solutions decreased from 192 268 to 28 400GHz with increasing composition x from 0 to 2. On the other hand, the Q· f values of the Mg 4(Nb 2− y Sb y )O 9 solid solutions were remarkably improved by the Sb substitution for Nb; the highest Q· f value of 285 423 GHz was obtained at y=1. It was found that an increase in the Q· f values of Mg 4(Nb 2− y Sb y )O 9 solid solutions may related to the grain size decreased which is opposite to general results and this relation is consistent with that of Al 2O 3.
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