In this work, we prepare Ba1-xSrxTi0.9Mn.01O3-delta (x = 0.00, 0.01, 0.03, 0.05, and 0.07) ceramics by the mixed oxide method and study the relationship between phase transition and dielectric property of the ceramics. The phase of the samples transformed from a hexagonal phase to mixed phases due to the increase in Sr doping amount. The X-ray diffraction (XRD) profiles and Raman spectra of the samples also show the same phase transformation due to increasing Sr doping amount. The XRD pattern of the undoped sample indicates a single h-BaTiO3 phase with P6(3)/mmc symmetric space group, while the samples with high Sr doping amounts have a mixed phase with t-BaTiO3 with P(4)mm symmetric space group. The scanning electron microscopy images show two types of BaTiO3 grains, which grew with increasing sintering temperature. With increasing Sr concentration, the K-values (relative dielectric constant) of the ceramics increased, while the Q(xf) values (the quality factor multiplied by frequency) decreased, which indicate that the microwave dielectric property is related to phase transformation.
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INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY 卷冊: 16 期: 5 頁數: 2060-2064 特刊: SI
