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XRD patterns of the precipitates yielding HAp (a) or ACP (b) when promptly separated from their parent solutions, washed and dried. The XRD patterns were collected on precipitates sampled out of their parent solutions after different periods of time following precipitation, showing the course of the transformation of the initial precipitates into crystalline HAp through amorphous intermediates. Diffraction peaks indexed with full circles are HAp-derived.
