科研之友
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摘要
This paper reports a simple and inexpensive method for preparing fine scale (empty set 260 mu m) and high-density Magneli phase (TinO2n-1) conductive ceramic fibres. The structure of the fibres was characterized by X-ray diffraction and scanning electron microscopy and their phase and microstructure was related to frequency dependent impedance measurements. The process employed is capable of producing dense (%26gt;96%) Ti-suboxide fibres, and by using a reduction temperature of 1200 degrees C and 1300 degrees C it is possible to produce Magneli phase fibres. The electrical conductivity of the reduced fibres can be tuned in a range of five orders of magnitude (10(-1)-10(4) S m(-1)) and the increase in conductivity was 10(13) relative to stoichiometric TiO2. Such novel conductive fibres have the potential to be used as a sensing element, electrode, catalyst support and in energy storage applications.
- 出版日期2014
