Abstract
BiNbO 4 ceramics were developed by using CuO–V 2O 5 as a liquid phase sintering agent. The resultant dielectric properties were analyzed in terms of the densification and the amount of CuO–V 2O 5 sintering agent. The addition of 0.8 wt.% CuO–V 2O 5 as its sintering agent was observed to perform most satisfactory. At 850 °C, uniform and enhanced microstructure was observed for the BiNbO 4 specimen with 0.8 wt.% CuO–V 2O 5 addition. Furthermore, the effect of CuO–V 2O 5 addition on the microwave dielectric properties of BiNbO 4 was also investigated. As the sintering temperature increased to 900 °C, the dielectric constant increased but nearly constant and the quality factor ( QF) showed a maximum at 850 °C and then decreased for all compositions of the 900 °C sintered specimens. With an increase in CuO–V 2O 5 content, the temperature coefficient of frequency ( TCF) increased in accordance with the dielectric mixing rule and microstructural behavior.
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