Abstract
The CdWO4 powders were synthesized by using a high energy ball mill method, and microwave dielectric of (1−x)CdWO4–xTiO2 (0 ≤ x ≤ 0.22) composite ceramics have been investigated. X-ray powder diffraction and SEM analysis revealed that CdWO4 and TiO2 coexisted as a mixture. With addition of nanometer TiO2, the sintered temperature of CdWO4 ceramic was reduced from 1025 °C to 900 °C. With increase of x, the Q × f values of (1−x)CdWO4–xTiO2 ceramics decreased and the εr values increased. The τf value depends on x as well as sintering temperatures. The ceramics of 0.79CdWO4–0.21TiO2 sintered at 900 °C showed εr = 13.7, Q × f = 15000 GHz, τf = 0 ppm/°C and the chemical compatibility with Ag make it suitable as LTCC dielectric devices.
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