Abstract
Annealing conditions leading to the crystallization of amorphous silicon nitride occurring upon nitriding of Fe–Si alloys have been found. A brief thermodynamic explanation for the occurrence of this unexpected amorphous-to-crystal transition is given. The crystalline precipitates were found to be α-Si3N4 and follow the orientation relationship given by ( 1 1 ¯ 0 ) α -Fe / / ( 10 1 ¯ 0 ) α - Si 3 N 4 with [ 111 ] α -Fe / / [ 0001 ] α - Si 3 N 4 . This transition happens in precipitates with a constant Si3N4 composition. This structural change also leads to a morphological change from the initial cube-like shape to a hexagonal prism.
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