Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 93, Issue 4, Pages 920-924Publisher
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1551-2916.2009.03496.x
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Funding
- Fonds der Chemischen Industrie, Frankfurt, Germany
- Deutsche Forschungsgemeinschaft, Bonn, Germany [DFG-SPP 1181]
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Piezoresistivity was found in silicon oxycarbide (SiOC) ceramics synthesized using a polymer-to-ceramic transformation process. A commercial polysiloxane, namely poly(methylsilsesquioxane), was used as the starting material. The SiOC ceramic synthesized at 1400 degrees C exhibits high piezoresistivity, leading to strain sensitivities (k factors) of similar to 145, while lower pyrolysis temperatures (1000 degrees-1300 degrees C) do not show a piezoresistive effect. Structural characterization by X-ray diffraction in combination with micro-Raman spectroscopy revealed that with increasing pyrolysis temperature, the content of free carbon in the X-ray amorphous SiOC matrix increases without changes in the overall composition. Percolation effects related to the carbon-based phase segregated from the SiOC matrix are responsible for the piezoresistivity analyzed in the SiOC ceramic.
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