Microstructure and Microwave Dielectric Properties of ($1-x$)Ba(Co1/3Nb2/3)O3–$x$Ba(Zn1/3Nb2/3)O3 Ceramics

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The microstructure and microwave dielectric properties of ($1-x$)Ba(Co1/3Nb2/3)O3–$x$Ba(Zn1/3Nb2/3)O3 [($1-x$)BCN–$x$BZN] ceramics with $0.0\leq x\leq 1.0$ were investigated. When the sintering temperature was 1400°C, a homogeneous phase with a $1:2$ ordered structure was found in the specimens with $x\leq 0.3$ but for the specimens with $x\geq 0.6$, a disordered structure and BaNb6O16 second phase were found. The grain growth related to the BaNb6O16 second phase occurred in the specimens with $x\geq 0.5$. The temperature coefficient of the resonant frequency ($\tau_{\text{f}}$) increased with increasing $x$, and the specimens with $0.3\leq x\leq 0.4$ have zero $\tau_{\text{f}}$. Dielectric constant ($\varepsilon_{\text{r}}$) increased with the increase in $x$ and was about 34.5 when $x=0.3$. For the specimens with $x\leq 0.3$, the $Q\times f$ value was high but decreased as $x$ exceeded 0.3. The maximum $Q\times f$ value, 97,000 GHz, was obtained for 0.7BCN–0.3BZN ceramics sintered at 1400°C for 20 h.
2003-11-15