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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

REFERENCES

1.Thermodynamic Properties of Individual Substances, 4th ed., edited by Gurvich, L. V., Veyts, I. V., and Alcock, C. B. (Hemisphere, New York, 1991), Vol. 2.Google Scholar
2.Wood, J. L., Adams, G. P., Mukerji, J., and Margrave, J. L., Third International Conference on Chemical Thermodynamics, Badenbei-Wien, Austria, 3–7 September, 1973, pp. 115–122.Google Scholar
3.Rocabois, P., Chatillon, C., and Bernard, C., J. Am. Ceram. Soc. 79, 1351–1360 (1996).CrossRefGoogle Scholar
4.Riedel, R., Kienzle, A., Dressler, W., Ruwisch, L., Bill, J., and Aldinger, F., Nature 382, 796–798 (1996).CrossRefGoogle Scholar
5.Andrievski, R. A., Int. J. Self-Propagating High-Temp. Synth. 4, 237–244 (1995).Google Scholar
6.Gazzara, C. P. and Messier, D. R., Am. Ceram. Soc. Bull. 56, 777–780 (1977).Google Scholar
7.O'Hare, P. A. G. and Hope, G. A., J. Chem. Thermodyn. 24, 639–647 (1992).CrossRefGoogle Scholar
8.O'Hare, P. A. G., unpublished results.Google Scholar
9.Nuttall, R. L., Wise, S., and Hubbard, W. N., Rev. Sci. Instrum. 32, 1402–1403 (1961).CrossRefGoogle Scholar
10.O'Hare, P. A. G., Susman, S., Volin, K. J., and Rowland, S. C., J. Chem. Thermodyn. 24, 1009–1017 (1992).CrossRefGoogle Scholar
11.Johnson, G. K., J. Chem. Thermodyn. 18, 801–802 (1986).CrossRefGoogle Scholar