29Si and 13C Solid-State NMR Spectroscopic Study of Nanometer-Scale Structure and Mass Fractal Characteristics of Amorphous Polymer Derived Silicon Oxycarbide Ceramics

Polymer derived silicon oxycarbide ceramics (SiOC-PDCs) with widely different carbon contents have been synthesized, and their structures have been studied at different length scales using high-resolution 13C and 29Si magic-angle-spinning (MAS) NMR spectroscopic techniques. The data suggest that the...

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Bibliographic Details
Published in:Chemistry of materials 2010-12, Vol.22 (23), p.6221-6228
Main Authors: Widgeon, S. J, Sen, S, Mera, G, Ionescu, E, Riedel, R, Navrotsky, A
Format: Article
Language:English
Subjects:
Glasses
Precursor Routes to Materials (including Polymer-Derived Ceramics)
Structural Characterization (including AFM, NMR, X-ray Diffraction, etc.)
Online Access:Get full text
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Summary:Polymer derived silicon oxycarbide ceramics (SiOC-PDCs) with widely different carbon contents have been synthesized, and their structures have been studied at different length scales using high-resolution 13C and 29Si magic-angle-spinning (MAS) NMR spectroscopic techniques. The data suggest that the structure of these PDCs consists of a continuous mass fractal backbone of corner-shared SiCxO4-x tetrahedral units with “voids” occupied by sp2-hybridized graphitic carbon. The oxygen-rich SiCxO4-x units are located at the interior of this backbone with a mass fractal dimension of ∼2.5 while the carbon-rich units display a slightly lower dimensionality and occupy the interface between the backbone and the free carbon nanodomains.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm1021432