Abstract
In this work, the effects of calcination temperature in the range of 550–800°C for 2 h and sintering temperature in the range of 1000–1100°C for 2 h on phase formation, microstructure and dielectric properties of the potassium sodium niobate-bismuth zinc titanate [0.995(K0.5Na0.5)NbO3–0.005Bi(Zn0.5Ti0.5)O3] (KNN-BZT) ceramics prepared via combustion technique were investigated. Glycine was used as fuel to reduce the reaction temperature. It was found that a single orthorhombic perovskite phase of KNN-BZT powders was observed from the sample calcined at 650°C for 2 h, which was lower than the conventional mixed oxide route ∼200°C. The single orthorhombic perovskite phase was detected in the sample sintered at the temperature lower than 1075°C. The secondary phase of Bi2Ti2O7 was found in the sample sintered at 1100°C. The microstructure of the KNN-BZT powders exhibited an almost-spherical morphology and a highly agglomerated form. The particle size was ranging from 0.2–0.3 μm and the average grain size of the ceramics increased as sintering temperature increased. The optimum condition of sintering was obtained for the sample sintered at 1075°C for 2 h. This sample exhibited maximum density (97%), highest dielectric constant (6400) and excellent ferroelectric properties (Pr = 20.5 μC/cm2 and Ec = 9.7 kV/cm).
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