Abstract
Abstract Effects of composition and sintering conditions upon the microstructures and the microwave dielectric characteristics of Ba 6−3 x (Sm 1−btl y Nd y ) 8+2 x Ti 18 O 54 solid solution ( x =2/3) were investigated. The dielectric constant increased and the temperature coefficient of resonant frequency τ f could be adjusted from negative to positive with increasing Nd content in the solid solution, while the high Qf factor (>9000 GHz) was obtained. It should be emphasized that the temperature coefficient of resonant frequency was significantly affected by sintering time and the zero-temperature coefficient composition shifted to Nd-rich side with increasing sintering time. The excellent microwave dielectric properties were achieved in the ceramics with y =0.8 sintered at 1340 °C for 12 h: e =85, Qf =9,460 GHz, and calculated τ f =+0.8 ppm/°C.
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