Influence of Fabrication Processing on Perovskite Phase Formation of KNN-BZT

M. Sutapun; R. Muanghlua; Chien Chih Huang; David P. Cann; Wanwilai C. Vittayakorn; Naratip Vittayakorn

doi:10.4028/www.scientific.net/AMR.55-57.113

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Influence of Fabrication Processing on Perovskite Phase Formation of KNN-BZT

Abstract:

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.