Journal
JOURNAL OF MATERIALS RESEARCH
Volume 21, Issue 7, Pages 1787-1792Publisher
SPRINGER HEIDELBERG
DOI: 10.1557/JMR.2006.0201
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In this work, Sr4La2Ti4Nb6O30 ceramics with tetragonal filled tungsten bronze structure were prepared, and the dielectric characteristics and ferroelectric transition were investigated. The room-temperature dielectric constant of the present ceramics showed very weak frequency dependency; it decreased from 570.4 to 561.7 when the frequency varied from 200 Hz to 1 MHz, and a comparatively low-dielectric loss was observed (in the order of 10(-3)). Unlike the situation for Ba(4)Ln(2)Ti(4)Nb(6)O(30) (Ln = La, Nd and Sm), Sr4La2Ti4Nb6O30 ceramics showed a diffuse ferroelectric phase transition, and the diffuseness exponent gamma was 1.61. Moreover, the obvious frequency dispersion was observed over a broad frequency range from 200 Hz to I MHz, and the maximum dielectric constant temperature T-max shifted to higher temperatures with increasing frequency. The dielectric data agreed closely with the Vogel-Fulcher relationship. We concluded that tungsten bronze Sr4La2Ti4Nb6O30 has the relaxor ferroelectric nature.
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