Structural Evolution of a Stoichiometric Silicon Oxycarbide from Gel Through Glass to Decomposition

  1. Prof. Dr. G. Müller
  1. H. Brequel1,
  2. L. Schiffini1 and
  3. S. Enzo1,2

Published Online: 27 APR 2006

DOI: 10.1002/3527607293.ch55

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

How to Cite

Brequel, H., Schiffini, L. and Enzo, S. (2000) Structural Evolution of a Stoichiometric Silicon Oxycarbide from Gel Through Glass to Decomposition, in Ceramics - Processing, Reliability, Tribology and Wear, Volume 12 (ed G. Müller), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607293.ch55

Editor Information

  1. Fraunhofer-Institut für Silicatforschung, Neunerplatz 2, 97082 Würzburg, Germany

Author Information

  1. 1

    Dipartimento di Chimica, Sassari (Italy)

  2. 2

    Unità INFM Dipartimento di Chimica Fisica, Venezia (Italy)

Publication History

  1. Published Online: 27 APR 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301942

Online ISBN: 9783527607297

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Keywords:

  • ceramics;
  • stoichiometric silicon oxycarbide compound;
  • sol-gel method;
  • pyrolysis

Summary

The appropriate mixture of two polymeric precursors methyldiethoxysilane HSi(OEt)2CH3 (MDES) and triethoxysilane HSi(OEt)3 (TREOS) leads, by sol-gel method to the true stoichiometric silicon oxycarbide compounds SiC0.3O1.5. Pyrolysis of the specimen at 1000 °C makes it possible to obtain the corresponding glass, and further heat treatment leads to decomposition. Wide Angle X-ray Diffraction is presented for each step of pyrolysis. The short-range order is extracted by the Radial Distribution Function approach until 1000 °C, when a single amorphous phase is observed. The relation between short range order and phase separation is discussed with reference to results obtained at temperatures above 1000 °C.