Abstract
The effects of the Ta substitution for Nb and the Zr substitution for Ti on the microwave dielectric properties and crystal structure of Sm(Nb 1− x Ta x )(Ti 1− y Zr y )O 6 ceramics were investigated in this study. The Sm(Nb 1− x Ta x )TiO 6 ( x = 0–1) ceramics were single phase, whereas the limit of solid solutions for the SmTa(Ti 1− y Zr y )O 6 ceramics was y = 0.4. In the case of the Sm(Nb 1− x Ta x )TiO 6 ceramics, the dielectric constant and the temperature coefficient of resonant frequency were decreased, whereas the quality factor was increased by the Ta substitution for Nb. The maximum Q · f value was obtained when the SmTaTiO 6 was synthesized, and the microwave dielectric properties are, ɛ r = 37.6; τ f = 24.2 ppm/°C; and Q · f = 24541 GHz. On the other hand, the dielectric constants of the SmTa(Ti 1− y Zr y )O 6 ceramics were decreased from 37.6 to 28.9, whereas the quality factor was increased from 24541 to 38320 GHz with increasing composition y from 0 to 0.4. The temperature coefficient of resonant frequency of the ceramics varied from 24.2 to −11.6 ppm/°C. A near zero temperature coefficient of resonant frequency results from the composition of y = 0.3 with a dielectric constant of 31.1 and Q · f value of 37481 GHz.
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