Abstract
An abnormal refinement of grains was observed in a study of low temperature crystallization process of a calcium phosphate film. During the process, grains of about 500 nm were formed from the amorphous background of the film after 30 minutes, then followed by a decrease of the grain size to about 60 nm after 1 hour and to about 28 nm after 3 hours at 400°C. This phenomenon is quite different from that predicted by the classical theory of crystallization where the crystals always coarsen in the process of heat treatment. A modified secondary crystallization model was presented to interpret the abnormal phenomenon in the calcium phosphate films.
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