Original Article

Correlation Between Grain Sizes and Electrical Properties of CaBi2Nb2O9 Piezoelectric Ceramics

  1. Huanbei Chen1,
  2. Bo Shen1,
  3. Jinbao Xu2,
  4. Lingbing Kong3,
  5. Jiwei Zhai1,*

Article first published online: 4 JUL 2012

DOI: 10.1111/j.1551-2916.2012.05327.x

Issue

Journal of the American Ceramic Society

Journal of the American Ceramic Society

Volume 95, Issue 11, pages 3514–3518, November 2012

Additional Information

How to Cite

Chen, H., Shen, B., Xu, J., Kong, L., Zhai, J. (2012), Correlation Between Grain Sizes and Electrical Properties of CaBi2Nb2O9 Piezoelectric Ceramics. Journal of the American Ceramic Society, 95: 3514–3518. doi: 10.1111/j.1551-2916.2012.05327.x

Author Information

  1. 1

    Functional Materials Research Laboratory, Tongji University, Shanghai, China

  2. 2

    Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, China

  3. 3

    School of Materials Science and Engineering, Nanyang Technological University, Singapore

*Author to whom correspondence should be addressed. e-mail: apzhai@tongji.edu.cn

Publication History

  1. Issue published online: 2 NOV 2012
  2. Article first published online: 4 JUL 2012
  3. Manuscript Accepted: 7 MAY 2012
  4. Manuscript Received: 27 MAR 2012

Funded by

  • National Natural Science Foundation of China. Grant Number: 50932007
  • Chinese Academy of Sciences

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Calcium bismuth niobate (CaBi2Nb2O9, CBN) is a high Curie temperature (TC=930°C) ferroelectrics material and a promising candidate for high-temperature piezoelectric applications. This study focuses on the effect of the grain size on the electric properties and thermal stability of CBN ceramics. The CBN ceramics with different grain sizes were prepared by three different sintering methods: normal sintering, two-step sintering, and hot pressing sintering. Result shows that a strong dependence of piezoelectric properties on the grain size. The d33 of two-step sintering samples with 1.4 μm grain size is 13.5 pC/N which is more than double of that the normal sintering sample with only about 6 pC/N. With the grain size increasing, the unit-cell volume of CBN ceramic is expanded and the TC shift to higher temperature for enhanced stability of the orthorhombic structure. The thermal stability of piezoelectric properties is enhanced from room temperature to near Curie temperature when the grain size is larger than that of 4.3 μm. However, the thermal stability is decreased with decreasing of the grain size since internal stresses provide an additional driving force that assists the thermal depolarization.

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