Solid State NMR, X-Ray Diffraction, and Infrared Characterization of Local Structure in Heat-Treated Oxyhydroxyapatite Microcrystals: An Analog of the Thermal Decomposition of Hydroxyapatite during PlasmaSpray Procedure

The structure of plasma-sprayed hydroxyapatites possesses a variety of partially dehydrated hydroxyapatite structures. Nuclear magnetic resonance, IR spectroscopy, and X-ray diffraction have been used to analyze the structure of partially dehydrated hydroxyapatites. The oxyhydroxyapatites are prepared from crystalline hydroxyapatite by thermal treatment in air. The obtained results enable an advanced phase analysis of plasma-sprayed hydroxyapatite layers.