INFLUENCE OF RARE-EARTH IONS ON BAO-TIO2-RARE EARTH OXIDE CERAMICS FOR MICROWAVE APPLICATIONS

The dielectric ceramic materials, 0.143BaO-0.714TiO2-0.143 rare earth oxides (REO(x)), have unique dielectric properties at microwave freque ncies, which depend on the rare earth element (RE=Pr, Nd, Sm). In orde r to study the effect of the rare earth ions on dielectric properties, infrared reflection spectra of these ceramics were measured from 50 t o 4000 cm-1 at room temperature. These data were analyzed according to the model proposed by Gervais and Piriou. Also, the fourth-order diel ectric constants of these materials were estimated for the purpose of investigating the relationship between the dielectric loss and the anh armonic terms in the potential energy.