The microwave dielectric properties and the microstructures of 0.5LaAlO3-0.5SrTiO3 ceramics with CuO addition prepared with conventional solid-state route have been investigated. Doping with CuO (up to 1 wt.%) can effectively promote the densification and remain comparable dielectric properties of 0.5LaAlO3-0.5SrTiO3 ceramics. It is found that 0.5LaAlO3-0.5SrTiO3 ceramics can be sintered at 1400 °C due to the sintering aid effect resulted from CuO as addition observed by scanning electron microscopy. The dielectric constant as well as the Q × f value decreases with increasing CuO content. At 1460 °C, 0.5LaAlO3-0.5SrTiO3 ceramics with 0.25 wt.% CuO addition possess a dielectric constant (εr) of 35.2, a Q × f value of 24000 (at 8 GHz) and a temperature coefficient of resonant frequency (τf) of -13.5 ppm/°C.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry