Microwave Dielectric Properties and Far Infrared Reflectivity Spectra of the (Zr_0.8Sn_0.2)TiO₄ Ceramics with Additives

Microwave dielectric properties and far infrared reflectivity spectra were investigated in the (Zr_0.8Sn_0.2)TiO₄ ceramics with 1 mol% Sb₂O₅, Sb₂O₃ and Nd₂O₃, respectively. Dielectric constant was not significantly changed, while the unloaded Q value was affected with additives. The unloaded Q of the pure (Zr_0.8Sn_0.2)TiO₄ specimens was higher than that of the specimens with Sb₂O₃ and/or Nd₂O₃, but lower than that of the specimens with Sb₂O₅. The high unloaded Q value of 6600 at 7 GHz was obtained for the specimens with 1 mol% Sb₂O₅ due to elimination of oxygen vacancies. The effects of additives on the intrinsic microwave losses of the specimens were investigated by the infrared reflectivity spectra from 50 to 4000 cm^-1, which were evaluated using the Kramers-Kronig analysis and classical oscillator model. The relative tendency of microwave dielectric properties calculated from the reflectivity data was in good agreement with the results by the Hakki and Coleman's method.