Effect of Pyrolysis Temperature on the Piezoresistivity of Polymer-Derived Ceramics

    Authors

    Y. G. Wang; J. A. Ding; W. Feng;L. A. An

    Comments

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    Abbreviated Journal Title

    J. Am. Ceram. Soc.

    Keywords

    RESIST; CARBON; Materials Science, Ceramics

    Abstract

    Amorphous silicon carbonitride (SiCN) ceramics were synthesized by pyrolyzing a polysilazane at different temperatures between 900 degrees and 1400 degrees C. The microstructures and compositions of the materials obtained were analyzed using X-ray diffraction, elemental analysis, and Raman spectroscopy. To study their piezoresistive behavior, the resistivity of the resultant materials were measured as a function of applied stress. We found that the piezoresistive behavior of all materials can fit the tunneling-percolation model. The piezoresistive stress coefficient of the materials obtained at temperatures below 1200 degrees C showed both reverse and logarithmical dependences on applied stress, but that of the materials obtained at higher temperatures showed only logarithmical dependence. We believe that the pyrolysis temperature induces a change in the free carbon structure thus, causing this effect on the piezoresistivity.

    Journal Title

    Journal of the American Ceramic Society

    Volume

    94

    Issue/Number

    2

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    359

    Last Page

    362

    WOS Identifier

    WOS:000286830100014

    ISSN

    0002-7820

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