Commercially available hydroxyapatite (HA) has been subjected to different temperatures and sintering-time schedules, to examine the effects of these two variables on crystal structure. Small but significant decreases in unit-cell volume and hydroxy-ion channel size are seen on sintering for 1 h at temperatures in excess of 1000 °C. This has been ascribed to the loss of small amounts of carbonate from the channels within the structure. The stability of the HA phase was seen up to a sintering temperature of 1400 °C, with decomposition only seen in the 1450 °C sinter. Extended sintering times at 1300 °C failed to cause decomposition; however, small increases in c-axis length and unit-cell volume were observed.
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Abrahams et al. (1994) studied this question.
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