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MgO Doping Effects on Dielectric Properties of Ba 0.55 Sr 0.45 TiO 3 Ceramics
Author(s) -
Zhang Mingwei,
Zhai Jiwei,
Shen Bo,
Yao Xi
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04577.x
Subject(s) - raman spectroscopy , materials science , dielectric , dissipation factor , microstructure , perovskite (structure) , doping , analytical chemistry (journal) , dielectric loss , octahedron , microwave , ceramic , mineralogy , crystal structure , crystallography , chemistry , metallurgy , optics , physics , optoelectronics , chromatography , quantum mechanics
MgO‐doped Ba 0.55 Sr 0.45 TiO 3 ceramics were prepared by solid‐state reaction technique and their phase compositions, microstructure and dielectric properties were systematically characterized. Their dielectric peaks were markedly suppressed, broadened, and shifted to low temperatures with increasing MgO content, indicating that a certain amount of Mg 2+ incorporated into BST lattice. The reason why the loss tangent at microwave frequencies increased with the addition of MgO at low concentrations was identified. Raman spectra analysis clearly indicated that the incorporation of Mg 2+ degraded quality factor ( Q value) of BST, which was ascribed to the deterioration of B‐site ordering of the ABO 3 perovskite structure. It was found that Q value was strongly correlated with the Raman peak width of A1 (TO) stretch modes in perovskite materials. Also oxygen octahedron played an important role in determining the material's microwave performance. The decrease in loss tangent at microwave frequencies of the samples with high contents of MgO was resulted from the “composite” effect of the dielectric component.