Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 41, Pages 10155-10160Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.08.066
Keywords
Ba0.55Sr0.4Ca0.05TiO3; CaTiSiO5; Sintering temperature; Composite ceramics; Dielectric property
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The composite ceramics of Ba0.55Sr0.4Ca0.05TiO3-CaTiSiO5-Mg2TiO4 (BSCT-CTS-MT) were prepared by the conventional solid-state route. The sintering performance, phase structures, morphologies, and dielectric properties of the composite ceramics were investigated. The BSCT-CTS-MT ceramics were sintered at 1100. C and possessed dense microstructure. The dielectric constant was tailored from 1196 to 141 as the amount of Mg2TiO4 increased from 0 to 50 wt%. The dielectric constant and dielectric loss of 40 wt% Ba0.55Sr0.4Ca0.05TiO3-10 wt% CaTiSiO5-50 wt% Mg2TiO4 was 141 and 0.0020, respectively, and the tunability was 8.64% under a DC electric field of 8.0 kV/cm. The Curie peaks were broadened and depressed after the addition of CaTiSiO5. The optimistic dielectric properties made it a promising candidate for the application of tunable capacitors and phase shifters. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
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