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Dielectric characteristics and diffuse ferroelectric phase transition in Sr4La2Ti4Nb6O30 tungsten bronze ceramics

Published online by Cambridge University Press:  01 July 2006

X.L. Zhu ,
X.M. Chen ,
X.Q. Liu  and
Y. Yuan
X.L. Zhu
Affiliation:
Department of Material Science and Engineering, Zhejiang University,Hangzhou 310027, People's Republic of China
X.M. Chen*
Affiliation:
Department of Material Science and Engineering, Zhejiang University,Hangzhou 310027, People's Republic of China
X.Q. Liu
Affiliation:
Department of Material Science and Engineering, Zhejiang University,Hangzhou 310027, People's Republic of China
Y. Yuan
Affiliation:
Department of Material Science and Engineering, Zhejiang University,Hangzhou 310027, People's Republic of China
*
a) Address all correspondence to this author. e-mail: xmchen@cmsce.zju.edu.cn
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Abstract

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 Ba4Ln2Ti4Nb6O30 (Ln = La, Nd and Sm), Sr4La2Ti4Nb6O30 ceramics showed a diffuse ferroelectric phase transition, and the diffuseness exponent γ was 1.61. Moreover, the obvious frequency dispersion was observed over a broad frequency range from 200 Hz to 1 MHz, and the maximum dielectric constant temperature Tmax 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.

Keywords

CeramicDielectric propertiesFerroelectric
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 7 , July 2006 , pp. 1787 - 1792
Copyright
Copyright © Materials Research Society 2006

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