Pubblicato online: 09 feb 2013
Pagine: 122 - 125
DOI: https://doi.org/10.2478/s13536-012-0074-4
Parole chiave
© 2013 Wroclaw University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
The effects of CuO addition on the sintering behavior and microwave dielectric properties of Sr0.4Ca0.6La4Ti5O17 ceramics were investigated. CuO was selected as a liquid phase sintering aid to lower the sintering temperature of Sr0.4Ca0.6La4Ti5O17 ceramics. With CuO addition, the sintering temperature of Sr0.4Ca0.6La4Ti5O17 ceramics was effectively reduced from 1550 °C to 1475 °C. The crystalline phase exhibited no phase difference and no second phase was detected at all addition levels. The electric permittivity was not significantly affected by various amounts of CuO addition and ranged from 52 to 54. Small values (<+7 ppm/K) of the temperature coefficient of resonant frequency were obtained for Sr0.4Ca0.6La4Ti5O17 ceramics. However, the unloaded quality factor Q u was strongly dependent upon the CuO concentration. Q u f o ∼ 10500 GHz was obtained for Sr0.4Ca0.6La4Ti5O17 ceramics with 0.5 wt.% of CuO addition, sintered at 1475 °C.