Structural Characterization of Low-Sr-Doped Hydroxyapatite Obtained by Solid-State Synthesis

Strontium-substituted Ca10(PO4)6(OH)2 hydroxyapatite (HAp) powders, with Sr wt%concentrations of 2.5, 5.6 and 10%, were prepared by a solid-state synthesis method. The chemicalcomposition of the samples was accurately evaluated by using inductively coupled plasma (ICP)spectroscopy. The morphology of the samples was analyzed via optical microscopy, while structuralcharacterization was achieved through powder X-ray diffraction (PXRD) and infrared (FTIR) andRaman spectroscopy. The PXRD structural characterization showed the presence of the Sr dopant inthe Ca1 structural site for HAp with a lower Sr concentration and in the Ca2 site for the sample with ahigher Sr concentration. FTIR and Raman spectra showed slight band shifts and minor modificationsof the (PO4) bands with increasing the Sr doping rate.