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Preparation of Novel Saw-Toothed and Riblike α-Si3N4 Whiskers.
- Source :
-
Journal of Physical Chemistry B . Feb2006, Vol. 110 Issue 7, p3088-3092. 5p. - Publication Year :
- 2006
-
Abstract
- α-Si3N4 whiskers with novel saw-toothed and riblike structures have been synthesized in a high yield by a carbothermal reduction and nitridation route. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and selected-area electron diffraction (SAED). The results show that the saw-toothed whiskers with one smooth surface and another toothlike surface have lengths about several tens of microns and widths in the range of 600−1200 nm. The riblike whiskers are composed of Si3N4 rod-arrays, which grow closely packed perpendicular to the central axial whiskers with uniform diameter and length. The growth mechanism of the products can be considered as a combination of VS mechanism and secondary epitaxial nucleation process. The photoluminescence (PL) spectrum of the whiskers shows a strong blue light emission peak at 406 nm and a weak peak at 485 nm, suggesting their potential applications in light and electron emission devices. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15206106
- Volume :
- 110
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Journal of Physical Chemistry B
- Publication Type :
- Academic Journal
- Accession number :
- 20487587
- Full Text :
- https://doi.org/10.1021/jp0560258