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The dielectric property and phase transition of Sr‐doping effect of Ba 1− x Sr x Ti 0.9 Mn 0.1 O 3‐δ ceramic
Author(s) -
Lei ChienMing,
Siao YaShan
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13209
Subject(s) - materials science , dielectric , analytical chemistry (journal) , raman spectroscopy , phase (matter) , doping , scanning electron microscope , sintering , phase transition , ceramic , mineralogy , optics , condensed matter physics , metallurgy , chemistry , composite material , optoelectronics , physics , organic chemistry , chromatography
In this work, we prepare Ba 1− x Sr x Ti 0.9 Mn .01 O 3‐δ ( 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‐BaTiO 3 phase with P6 3 /mmc symmetric space group, while the samples with high Sr doping amounts have a mixed phase with t‐BaTiO 3 with P 4 mm symmetric space group. The scanning electron microscopy images show two types of BaTiO 3 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.