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Journal of Inorganic Materials

Journal of Inorganic Materials >

2009 , Vol. 24 >Issue 4: 869 - 872

DOI: https://doi.org/10.3724/SP.J.1077.2009.09029

Research Letter

Nanoscale Elastic Response of Grain Boundaries in ZnO Varistors by Acoustic Mode AFM

  • ZHAO Kun-Yu ,
  • ZENG Hua-Rong ,
  • SONG Hong-Zhang ,
  • CHENG Li-Hong ,
  • ZENG Jiang-Tao ,
  • CAI Wen-Jie ,
  • HUI Sen-Xing ,
  • LI Guo-Rong ,
  • YIN Qing-Rui
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  • 1. State Key Lab of High Performance Ceramics and Superfine Structures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

Received date: 2009-01-09

  Revised date: 2009-02-20

  Online published: 2009-07-20

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Abstract

Low-frequency acoustic mode atomic force microscopy was successfully developed based on the commercial AFM. The experimental results on nanometer scale elastic response at the grain boundaries in ZnO varistors assessed by the technique were presented. Different acoustic contrast of the individual micro-grains at grain boundaries were examined which reflected the distribution of additives. The acoustic contrasts enhanced at the grain boundaries can be observed clearly, which present possibility of crystal lattice expanding of Bi-rich phase caused by phase transition in the heat treatment. The lateral resolution of acoustic image is down to nanometer scale. The results show the application perspective of low-frequency scanning probe acoustic microscopy in functional materials at submicro- or nanometer scale.

Key words： scanning probe microscopy; acoustic; local elasticity; ZnO varistor; grain boundary

Cite this article

ZHAO Kun-Yu , ZENG Hua-Rong , SONG Hong-Zhang , CHENG Li-Hong , ZENG Jiang-Tao , CAI Wen-Jie , HUI Sen-Xing , LI Guo-Rong , YIN Qing-Rui . Nanoscale Elastic Response of Grain Boundaries in ZnO Varistors by Acoustic Mode AFM[J]. Journal of Inorganic Materials, 2009 , 24(4) : 869 -872 . DOI: 10.3724/SP.J.1077.2009.09029

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