Powder XRD patterns of (1−x)ST-xBZT ceramics with x = 0.05, 0.10, 0.15, 0.20, 0.30, and 0.50 sintered at 1100 °C for 3 h. The inset shows the XRD patterns for x = 0.30 and 0.50. The Miller indices given on top of the reflections correspond to cubic perovskite structure while the peaks marked with asterisk correspond to impurity Bi2Ti2O7 phase.
Observed (dots), calculated (continuous line), and difference (continuous bottom line) profiles for (1−x)ST-xBZT ceramics with x = 0.05, 0.10, 0.15, and 0.20 obtained after Rietveld analysis of the powder XRD data using cubic space group Pm3m. The vertical tick marks above the difference plot show the peak positions. The peaks marked with asterisk correspond to impurity Bi2Ti2O7 phase.
SEM image of the sintered pellet surface for (a) 0.95ST-0.05BZT and (b) 0.70ST-0.30BZT ceramics. The smaller size grains in (b) correspond to the perovskite phase while the bigger grains with flaky appearance are due to the impurity Bi2Ti2O7 phase.
Variation of lattice parameter with temperature for 0.90ST-0.10BZT ceramics.
The frequency dependence of room temperature dielectric Permittivity and tanδ for (1−x)ST-xBZT ceramics with x = 0.05, 0.10, 0.15, and 0.20.
P-E hysteresis loop for 0.80ST-0.20BZT ceramic.
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