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The Pyrolytic Conversion of Perhydropolysilazane into Si3N4: X-Ray Diffraction Analysis
Published online by Cambridge University Press: 15 February 2011
Abstract
X-ray diffraction analysis was used to study the pyrolytic conversion of a preceramic polysilazane into Si3N4. Quantitative data for crystallite size, phase composition, and degree of crystallinity versus pyrolysis temperature and atmosphere (N2 and NH3) are presented. Pyrolytic products produced under N2 and NH3 atmospheres consist of microcrystals of silicon and a- and β-Si3N4. Under both atmospheres, a majority of the char is crystalline at ∼ 1270°C, and the entire char is crystallized at 1400°C. Pyrolysis under an NH3 atmosphere produces near stoichiometric Si3N4, while pyrolysis under N2 produces a silicon-rich material.
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- Copyright © Materials Research Society 1994