期刊
CERAMICS INTERNATIONAL
卷 48, 期 5, 页码 6819-6825出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.11.233
关键词
Relaxor ferroelectrics; Ceramics; Tetragonal tungsten bronze structure; Grain size effect
The influence of grain size on the dielectric properties of Sr0.6Ba0.4Nb2O6 (SBN60) ceramics with a tetragonal tungsten bronze structure was examined. The results showed that the maximum dielectric permittivity and dielectric maximum temperature of the SBN ceramics were less dependent on the grain size.
The influence of grain size on the dielectric properties of Sr0.6Ba0.4Nb2O6 (SBN60) ceramics with a tetragonal tungsten bronze structure was examined. The conventional and two-step sintering procedures were used to fabricate dense and phase-pure SBN60 ceramics with grain sizes ranging from 2.2 mu m to 17.3 mu m. In the temperature dependence of the dielectric permittivity, all samples showed a relaxor-like broad dielectric peak with a maximum at around 60 degrees C. The maximum dielectric permittivity and dielectric maximum temperature of the SBN ceramics were found to be less dependent on the grain size. The reason for the grain-size-insensitive dielectric properties of the SBN60 ceramics is discussed based on the analysis of the dielectric properties and Raman spectra.
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