Nanodomain Structure of Carbon-Rich Silicon Carbonitride Polymer-Derived Ceramics
Abstract:The presence of nanodomains in polymer-derived ceramics constitutes one of the most intriguing features of this class of materials. In the present work, the nanostructure of novel carbon-rich silicon carbonitride (SiCN) ceramics synthesized via thermolysis of poly(methylphenylsilylcarbodiimide), –[Ph(CH3) Si-NCN]n–, at 1300°, 1500°, 1700°, and 2000°C is investigated by micro-Raman spectroscopy, X-ray powder diffractometry, and small-angle X-ray scattering (SAXS). The structural information obtained from these experimental methods is combined together with theoretical modeling of the SAXS data to obtain a detailed model of the temperature-dependent evolution of nanodomains comprised of free carbon, SiC, and Si3N4 in SiCN-based ceramics.
Document Type: Research Article
Affiliations: 1: Technische Universität Darmstadt, Institut für Materialwissenschaft, Darmstadt, D-64287, Germany 2: Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, California 95616
Publication date: 2010-04-01