Microwave Dielectric Characteristics of Ca[(Li1/3Nb2/3)1-xZrx]O3-δ Ceramics

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The microwave dielectric characteristics of Ca[(Li1/3Nb2/3)1-xZrx]O3-δ ceramics were investigated. The microwave dielectric properties of Ca(Li1/3Nb2/3)O3-δ sintered at 1150°C exhibit a the dielectric constant ($\varepsilon_{\text{r}}$) of 29.6, a $Q{\cdot}f_{0}$ of 40000 GHz, and a temperature coefficient of resonant frequency ($\tau_{\text{f}}$) of $-21$ ppm/°C. To control of the $\tau_{\text{f}}$ of Ca(Li1/3Nb2/3)O3-δ, Zr4+ was substituted for [Li1/3Nb2/3]3.67+. As the Zr content increased, the $\varepsilon_{\text{r}}$ slightly increased and the $\tau_{\text{f}}$ shifted to positive and then negative value. However, the $Q{\cdot}f_{0}$ initially increased and then continuously decreased. A new composition having high $Q{\cdot}f_{0}$ (${\approx}36300$ GHz), high $\varepsilon_{\text{r}}$ (${\approx}30$), stable $\tau_{\text{f}}$ (${\approx}-5$ ppm/°C), and relatively low sintering temperature (1150°C) was developed and the relationship between microstructure and microwave dielectric characteristics was investigated.
2004-01-15