Abstract
Hydroxyapatite (HA) nanostructure powder was successfully synthesised by ball milling. Effect of starting materials, milling time and annealing temperature were investigated. Formation of HA during milling and annealing was studied by X-ray diffraction. Morphology and microstructure were monitored by SEM and TEM, respectively. The Reitveld refinement method was used for calculation of mean grain size and microstrain. Results showed that the HA was synthesised in COP and COC series after 5 h milling. There is no reaction in CCP and CCPH after 80 h milling. The synthesised HA partially transformed to TCP during annealing at 1000°C in COP and COC series. In all series, a nanostructure powder was obtained after milling. The minimum mean grain sizes of 25, 33, 44 and 39 nm were obtained for COP, COC, CCP and CCPH respectively, at the end of milling on the basis of Reitveld refinement analysis that is in consistent with TEM images. The significant grain growth and strain release took place during annealing. The maximum mean grain sizes of 115, 104, 79 and 116 nm were procured for COP, COC, CCP and CCPH respectively after annealing.
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