The thermal decomposition of a lamellar hydroxyapatite precursor containing crystalline complexes
leads to the formation of an apatite product with bonelike morphology. Solid-state 13C and 31P nuclear
magnetic resonance, infrared, and Raman vibrational spectroscopic data show that the hydroxyapatite
precursor contains acetyl hydrogen phosphonates and at least two types of acetate species. Phosphoryl and
carboxyl oxygens of the phosphonate group are chelated to the calcium ion. The oxygens of the other acetate
groups are involved in either monodentate bonding or chelation. The most important consequence of the
morphology of the intermediate is the formation of apatite retaining the precursor morphology. The process
emulates the formation of biogenic apatites, where the formation of an intermediate phase with platelike
morphology serves as a template for apatite formation with a morphology similar to that of the precursor.
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