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Energetics of cubic Si3N4

Published online by Cambridge University Press:  01 January 2006

Yahong Zhang ,
Alexandra Navrotsky  and
Toshimori Sekine
Yahong Zhang
Affiliation:
Thermochemistry Facility and NEAT ORU, University of California at Davis, Davis, California 95616
Alexandra Navrotsky*
Affiliation:
Thermochemistry Facility and NEAT ORU, University of California at Davis, Davis, California 95616
Toshimori Sekine
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
*
b)Address all correspondence to this author. e-mail: anavrotsky@ucdavis.edu
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Abstract

High-temperature oxide melt drop solution calorimetry was used to study the energetics of formation of cubic silicon nitride prepared at high pressure. The standard enthalpy of formation of c-Si3N4 is −776.3 ± 9.5 kJ/mol. The calorimetric measurement of Si3N4 in 3Na2O·4MoO3 solvent was validated by comparing the enthalpy of formation for β–Si3N4 with previous work using alkali borate solvent. The enthalpy of transformation from β– to c-Si3N4 is 80.2 ± 9.6 kJ/mol. This value appears consistent with the observed synthesis conditions, which do not represent reversed equilibrium reactions.

Keywords

CalorimetryCeramicThermodynamic properties
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 1 , January 2006 , pp. 41 - 44
Copyright
Copyright © Materials Research Society 2006

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References

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