3.3. Dielectric results
The temperature and frequency dependence curve of the dielectric constant (??) for SrxBa(1−x)Nb2O6 ceramics A 412997 given in Fig. 3(a). A strong dielectric dispersion is observed at the temperature of maximum dielectric constant (Tm). Basically, all the various composition spectra of SBN exhibit a broad phase transition. The maximum dielectric constant, εm at 1 kHz and Tm of each composition is displayed in Table 1. As the concentration of strontium increased, the εr value increased, reached the maximum value for SBN53 and started to decrease with further increment of the Sr composition. As for the SBN25, we were unable to measure the εm and the Tm because pseudopodia was above the measured temperature window .
Fig. 3. Frequency and temperature dependence of the dielectric constant, εr on heating for (a) SrxBa(1−x)Nb2O6 (x=0.25, 0.30, 0.50, 0.51, 0.53, 0.55, 0.57 and 0.60) and (b) SBN53 ceramics.Figure optionsDownload full-size imageDownload as PowerPoint slide