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The standard molar enthalpies of formation of α−Si3N4 and β−Si3N4 by combustion calorimetry in fluorine, and the enthalpy of the α-to-β transition at the temperature 298.15 K

Published online by Cambridge University Press:  31 January 2011

P. A. G. O'Hare ,
Iwona Tomaszkiewicz  and
H. J. Seifert
P. A. G. O'Hare
Affiliation:
Chemical and Physical Properties Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Iwona Tomaszkiewicz
Affiliation:
Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland
H. J. Seifert
Affiliation:
Max-Planck-Institut füur Metallforschung, Pulvermetallurgisches Laboratorium, D-70569 Stuttgart, Germany
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Abstract

The standard molar enthalpies of formation ΔfH°m of α−Si3N4 and β−Si3N4 have been determined by fluorine combustion calorimetry: ΔfH°m (Si3N4, cr, α, 298.15 K) = − (828.9 ± 3.4) kJ · mol−1 and ΔfH°m (Si3N4, cr, β, 298.15 K) = – (827.8 ± 2.5) kJ · mol−1. These results indicate that the enthalpy of the α-to-β transition, approximately (1 ± 4) kJ · mol−1, is negligible within experimental uncertainty.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 12 , December 1997 , pp. 3203 - 3205
Copyright
Copyright © Materials Research Society 1997

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References

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