High frequency dielectric properties of CaTiO₃-based microwave ceramics

Abstract

We have investigated the far-IR, submillimetre and microwave (MW) dielectric response of CaTiO3 (CT)–Sr(Mg1/3Nb2/3)O3 (SMN), CT–Sr(Zn1/3Nb2/3)O3 (SZN), CT–NdAlO3 (NA) and CT–LaGaO3 (LG) solid solutions ceramics series. The contribution of extrinsic losses has been analysed by extrapolation of the far-IR and terahertz dielectric data down to the MW range and comparison with directly measured data. This procedure has also been justified by comparing the losses in CT and LG ceramics with the losses in their crystalline forms published in the literature.