The microstructure and microwave dielectric properties of a (1-x)(Mg0.95 Ni0.05)TiO3 -xCa0.6La0.8/3TiO3 ceramics system have been investigated. The system was prepared using a conventional solid-state ceramic route. In order to produce a temperature-stable material, Ca0.6La0.8/3TiO3 was added for a near-zero temperature coefficient (τf). With partial replacement of Mg2+ by Ni2+, the dielectric properties of the (1-x) (Mg0.95Ni0.05) TiO3-xCa0.6La0.8/3TiO3 ceramics can be promoted. The microwave dielectric properties are strongly correlated with the sintering temperature and the composition. An excellent Q × f value of 118,000 GHz can be obtained for the system with x = 0.9 at 1325°C. For practical application, a dielectric constant (εr) of 24.61, a Q × f value of 102,000 GHz, and a temperature coefficient of resonant frequency (τf) of -3.6 ppm/°C for 0.85(Mg0.95 Ni0.05)TiO3-0.15Ca0.6La0.8/3 TiO3 at 1325°C are proposed. A parallel-coupled line band-pass filter is designed and simulated using the proposed dielectric to study its performance.
|Number of pages||9|
|Journal||International Journal of Applied Ceramic Technology|
|Publication status||Published - 2009 Sep 14|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry