Influence of Fabrication Processing on Perovskite Phase Formation of KNN-BZT
The binary system of (1-x)(K1/2Na1/2)NbO3–xBi(Zn1/2Ti1/2)O3; x = 0.0-0.30 ceramics was fabricated by conventionally mixed oxide and two-stage mixed oxide methods. Phase development of calcined powders and the crystal structure of sintered ceramics were analyzed by X-ray diffraction (XRD). The microstructure analyses were undertaken by scanning electron microscopy (SEM). In the conventional method, the perovskite phases were obtained for compositions containing only 10 mol % KNN. For compositions above this amount, a complex mixture of phases was observed. However, the complete solid solution of perovskite phase, prepared by two−stage mixed oxide, was retained up to 20 mole % BZT content. The experiments in this study suggest that the two-stage mixed oxide method helps to stabilize the perovskite phase better, when compared with the conventional method.
M. Sutapun et al., "Influence of Fabrication Processing on Perovskite Phase Formation of KNN-BZT", Advanced Materials Research, Vols. 55-57, pp. 113-116, 2008