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Thermodynamic stability of silicon oxycarbide Si5C6O2(Nicalon)

✍ Scribed by M. Nagamori; J. -A. Boivin; A. Claveau

Book ID
104735332
Publisher
Springer
Year
1995
Tongue
English
Weight
693 KB
Volume
30
Category
Article
ISSN
0022-2461

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✦ Synopsis

The standard entropy and heat of formation of amorphous silicon oxycarbide, Si5C602, have been assessed to be 161.1 J K -1 mo1-1 and -1282.3 kJ mol 1 respectively, based in part on the literature data of the mass-spectrometric vapour pressure of SiO(g) over a Nicalon fibre. Using the so-obtained standard Gibbs energy of Si5C602, new phase relations (predominance diagrams) of the Si-C O system have been computed and graphically shown for the temperature range 300-2400 K, including such condensed phases as C, Si, SiC, Si20, SiO, Si203, SiO2 and Si5C602. The thermal behaviour of Nicalon fibres can be quantified thermodynamically by use of the predominance diagrams.

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