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摘要:
A new type of FeTiTaO6 ceramics with a high density was synthesized by the solid-state method. X-ray diffraction and scanning electron microscopy patterns indicate that the specimens exhibit a rutile structure and the mean particle size was about 200-300 nm. The heterovalent substitutions of Fe3+ and Ta5+ at Ti4+ site drive the incipient ferroelectric to the relaxor behavior, and a strong dispersion of the maximum dielectric permittivity appears around T-m, which shifts towards higher temperatures with the increasing frequency. The variation of T-m with frequency follows the Vogel-Fulcher relationship well, wherein E-a=0.068 eV, T-f=508 K, and f(0)=109 Hz. These results indicate that the nonperovskite-type FeTiTaO6 ceramic is a promising candidate for lead-free relaxor ferroelectrics in practical applications.
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来源 :
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN: 0002-7820
年份: 2010
期: 9
卷: 93
页码: 2491-2494
3 . 9 0 0
JCR@2022
ESI学科: MATERIALS SCIENCE;
JCR分区:1
中科院分区:2