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(a–c) The changes in the d002-spacing of HAp crystallites in enamel, dentine and synthetic HAp powders samples, respectively, during heating and cooling stages (heating, red points; cooling, blue points). Intensity variation upon heating and cooling, caused by (d) HAp crystallites in enamel; (e) HAp crystallites in dentine and (f) synthetic HAp powders. The red marks in panel (f) indicate the occurrence of two new peaks. (Online version in colour.)
