Low-Temperature Sintering of High Permittivity Ca0.8Sr0.2TiO3–Li0.5Sm0.5TiO3 Microwave Dielectric Ceramics with B2O3–CuO Addition

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A low-temperature cofired ceramic (LTCC) composition for high-permittivity microwave dielectric ceramics is introduced. A sintering temperature of 900 °C for 0.19Ca0.8Sr0.2TiO3–0.81Li0.5Sm0.5TiO3 (CST–LST) is obtained following the combined addition of B2O3 and CuO. The effects of the total amount and B2O3–CuO proportion of the sintering aids on densification, microstructure, and microwave dielectric properties are investigated. LTCC microwave dielectric ceramics with good dielectric properties ($\varepsilon_{\text{r}} = 74$; $Q \times f = 2478$ GHz; $\tau_{\text{f}} = 0.55$ ppm/°C) and ($\varepsilon_{\text{r}} = 80.4$; $Q \times f = 3010$ GHz) are obtained for CST–LST–$x$ wt % [$y$B2O3–($1 - y$)CuO] compositions with $x = 7.5$, and $y = 0.5$ at 950 °C and with $x = 7.5$, and $y = 0.6$ at 900 °C.
2009-09-25