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Synthesis of Silicon Nitride Whiskers by Microwave Heating

Published online by Cambridge University Press:  16 February 2011

S. Gedevanishvili ,
K. Cherian ,
D. Agrawal  and
R. Roy
S. Gedevanishvili
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
K. Cherian
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
D. Agrawal
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
R. Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
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Abstract

Whiskers of silicon nitride were synthesized by heating silicon powder compacts, silicon single crystal and polycrystalline silicon in microwave in the presence of flowing forming gas or nitrogen. Various gas compositions and form of silicon used resulted in different whisker morphologies. Silicon powder as starting material leads to the formation of needle-like whiskers while silicon single crystal and polycrystalline silicon led to the formation of wool-like and web-like structures respectively. Length of the whiskers apparently depends on the holding time at the optimum temperature ~1350°C; whiskers up to 250 micrometers in length may be grown in 30 minutes. Microstructural data suggest that the silicon nitride whiskers form through gas-solid reaction and vapor-solid mechanism.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 413
Copyright
Copyright © Materials Research Society 1999

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