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

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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.

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Acknowledgments

The present work was partially supported by the Chinese National Basic Research Program under Grant Nos. 2002CB613302 and 2006CB922005 and the National Science Foundation of China under Grant Nos. 50332030 and 50721061. We acknowledge Professor J.M. Liu at Nanjing University for help with the P-E hysteresis loop measurements.

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Authors and Affiliations

  1. Laboratory of Dielectric Materials, Department of Material Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Xiao Li Zhu, Xiang Ming Chen & Xiao Qiang Liu

  2. Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei, 230026, China

    Xiao Guang Li

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  1. Xiao Li Zhu
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Correspondence to Xiao Li Zhu.

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Zhu, X.L., Chen, X.M., Liu, X.Q. et al. Dielectric relaxations, ultrasonic attenuation, and their structure dependence in Sr4(LaxNd1-x)2Ti4Nb6O30 tungsten bronze ceramics. Journal of Materials Research 23, 3112–3121 (2008). https://doi.org/10.1557/JMR.2008.0373

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