Microwave dielectric properties of temperature stable Li2ZnxCo1−xTi3O8 ceramics

The Li2ZnxCo1−xTi3O8 (x = 0.2–0.8) solid solution system has been synthesized by the conventional solid-state ceramic route and the effect of Zn substitution for Co on microwave dielectric properties of Li2CoTi3O8 ceramics has also been investigated. The microwave dielectric properties of these ceramics show a linear variation between the end members for all compositions. The optimized sintering temperatures of Li2ZnxCo1−xTi3O8 ceramics increase with increasing content of Zn. The specimen with x = 0.4 sintered at 1050 °C/2 h exhibits an excellent combination of microwave dielectric properties with ɛr = 27.7, Qu × f = 57,100 GHz and τf = −1.0 ppm/°C.

• The τf values of Li2ZnxCo1−xTi3O8 ceramics can be adjusted to zero with Zn substitution for Co.
• The Li2Zn0.4Co0.6Ti3O8 ceramic exhibits excellent microwave dielectric properties.
• These ceramics might be potential candidates for dielectric resonators.