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Effect of Ca and B incorporation into silicon oxycarbide on its microstructure and phase composition

Xie, Fangtong and Gonzalo-Juan, Isabel and Breitzke, Hergen and Fasel, Claudia and Trapp, Maximilian and Buntkowsky, Gerd and Kleebe, Hans-Joachim and Riedel, Ralf and Boccaccini, Aldo R. and Ionescu, Emanuel (2019):
Effect of Ca and B incorporation into silicon oxycarbide on its microstructure and phase composition.
In: Journal of the American Ceramic Society, Wiley VCH, Weinheim, Germany, ISSN 00027820,
DOI: 10.1111/jace.16620,
[Online-Edition: https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.16...],
[Article]

Abstract

Ca and/or B modified silicon oxycarbides were synthesized via pyrolysis of suitable polysilsesquioxane‐based single‐source precursors. Their polymer‐to‐ceramic transformation was investigated with thermogravimetric analysis, coupled with in situ evolved gas analysis. The prepared silicon oxycarbides were investigated with respect to their crystallization behavior, network architecture and chemical compositions. The network connectivity in silicon oxycarbides can be affected / tuned upon using two different “tools”: (i) firstly, the use of network modifiers, such as Ca in our study, leads to a slight depolymerization of the network via generation of a small amount of Q3 sites; (ii) secondly, the modification of silicon oxycarbide with B/Ca leads to a decrease of the carbon content in the network and thus to a significant decrease of its connectivity. By using these two different effects, the network connectivity in silicon oxycarbides can be finely tuned.

Item Type: Article
Erschienen: 2019
Creators: Xie, Fangtong and Gonzalo-Juan, Isabel and Breitzke, Hergen and Fasel, Claudia and Trapp, Maximilian and Buntkowsky, Gerd and Kleebe, Hans-Joachim and Riedel, Ralf and Boccaccini, Aldo R. and Ionescu, Emanuel
Title: Effect of Ca and B incorporation into silicon oxycarbide on its microstructure and phase composition
Language: English
Abstract:

Ca and/or B modified silicon oxycarbides were synthesized via pyrolysis of suitable polysilsesquioxane‐based single‐source precursors. Their polymer‐to‐ceramic transformation was investigated with thermogravimetric analysis, coupled with in situ evolved gas analysis. The prepared silicon oxycarbides were investigated with respect to their crystallization behavior, network architecture and chemical compositions. The network connectivity in silicon oxycarbides can be affected / tuned upon using two different “tools”: (i) firstly, the use of network modifiers, such as Ca in our study, leads to a slight depolymerization of the network via generation of a small amount of Q3 sites; (ii) secondly, the modification of silicon oxycarbide with B/Ca leads to a decrease of the carbon content in the network and thus to a significant decrease of its connectivity. By using these two different effects, the network connectivity in silicon oxycarbides can be finely tuned.

Journal or Publication Title: Journal of the American Ceramic Society
Publisher: Wiley VCH, Weinheim, Germany
Uncontrolled Keywords: network connectivity, silicon oxycarbides, SiOC
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
07 Department of Chemistry
07 Department of Chemistry > Physical Chemistry
Date Deposited: 12 Jun 2019 05:43
DOI: 10.1111/jace.16620
Official URL: https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.16...
Projects: German Science Foundation (DFG), project number 317658328, EU COST Action Smart Inorganic Polymers (CM 1302), German Science Foundation (DFG), IO 64/14-1
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