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.
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Zhang, Y., Navrotsky, A. & Sekine, T. Energetics of cubic Si3N4. Journal of Materials Research 21, 41–44 (2006). https://doi.org/10.1557/jmr.2006.0033
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DOI: https://doi.org/10.1557/jmr.2006.0033