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Dielectric relaxations, ultrasonic attenuation, and their structure dependence in Sr4(LaxNd1-x)2Ti4Nb6O30 tungsten bronze ceramics

Published online by Cambridge University Press:  31 January 2011

Xiao Li Zhu ,
Xiang Ming Chen ,
Xiao Qiang Liu  and
Xiao Guang Li
Xiao Li Zhu
Affiliation:
Laboratory of Dielectric Materials, Department of Material Science and Engineering, Zhejiang University, Hangzhou 310027, China
Xiang Ming Chen*
Affiliation:
Laboratory of Dielectric Materials, Department of Material Science and Engineering, Zhejiang University, Hangzhou 310027, China
Xiao Qiang Liu
Affiliation:
Laboratory of Dielectric Materials, Department of Material Science and Engineering, Zhejiang University, Hangzhou 310027, China
Xiao Guang Li
Affiliation:
Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The dielectric anomalies and their structure dependence were evaluated and discussed in Sr4(LaxNd1-x)2Ti4Nb6O30 ceramics, together with the analysis of ultrasonic velocity shift and attenuation spectra in the low-temperature range. The room-temperature structure was confirmed as the tetragonal in space group P4bm for all compositions. One diffuse ferroelectric peak and three relaxor ferroelectric peaks corresponding to the commensurate/incommensurate modulation of oxygen octahedra, polar clusters of A-site ion ordering, and B-site ion ordering, respectively, were observed in the composition with x = 0.25. With decreasing the radius difference between A1- and A2-ions (increasing x), the dielectric relaxations, especially the one originating from the polar clusters of A-site ion ordering, tended to increase significantly and overlap the diffuse ferroelectric peak, which was completely overlapped for x ⩾ 0.75. This process just reflected the increased disordering degree of both A- and B-site ions, and the analysis of ultrasonic attenuation strongly supported the above conclusions on dielectric relaxations and their structural origins. The ultrasonic attenuation peak at approximately 100 K corresponded to the freezing process of the dielectric relaxations, and the fluctuation with composition of the ultrasonic attenuation peaks between 150 and 260 K suggested the possible structure variation.

Keywords

CeramicDielectric propertiesFerroelectricity
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 11 , November 2008 , pp. 3112 - 3121
Copyright
Copyright © Materials Research Society 2008

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References

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