Microwave Characteristics of MgTiO₃–CaTiO₃ Dielectric Ceramics Fabricated Using Spark Plasma Sintering

Abstract

Spark plasma sintering (SPS) was used in preparing dense 0.93MgTiO 3 –0.07CaTiO 3 (MCT) ceramics, and their microstructure and microwave dielectric properties were investigated. Compared with conventional pressureless sintering, SPS was found to be effective in obtaining dense MCT ceramics with uniform microstructures at low temperatures, without any degradation of dielectric properties. The MCT specimen SPS-fabricated at 1150°C for 10 min exhibited excellent dielectric properties: a dielectric constant of 23 and a quality factor ( Qf ) of 70,000 GHz.