Abstract
The morphological transformations occurring in the precursor powders during the formation of the phase were investigated by scanning electron microscopy performed on the same location on the surface of a pellet, which underwent several heat treatments at for various times. Following the evolution of a given group of grains we have found that the formation of the crystals occurs simultaneously with a gradual decomposition of the intermediate phase. This result was confirmed by microprobe analysis as well as x-ray diffraction performed on the same samples. As a main result, we conclude that in the observed powder mixtures, the phase does not form from the pre-existing crystallites but through a nucleation and growth process. Based on the present observations, a model for the phase formation mechanism of is presented.
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