High-temperature metastability of cubic spinel Si[sub 3]N[sub 4]

Sekine, T.; Mitsuhashi, T.
October 2001
Applied Physics Letters;10/22/2001, Vol. 79 Issue 17, p2719
Academic Journal
The metastability of cubic spinel Si[sub 3]N[sub 4] has been investigated at high temperature, up to about 1800 K, and in Ar atmosphere by quench experiments and differential thermal analyses coupled with thermogravimetry. The results indicate that the enthalpy change from spinel-type Si[sub 3]N[sub 4] to β-Si[sub 3]N[sub 4] is -29.2±3.5 kJ/mol and that the transformation starts at 1670 K. The high-temperature metastability of spinel Si[sub 3]N[sub 4] may provide various directions for industrial applications. © 2001 American Institute of Physics.


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