The effect of the silicon incorporation on the hydroxylapatite structure. A neutron diffraction study |
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| Institution: | 1. Institute of Acoustics, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland;2. Department of Quantum Electronics, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland;3. NanoBioMedical Centre, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland;1. PG and Research Department of Physics, Arul Anandar College (Autonomous), Karumathur, Madurai 625514, Tamil Nadu, India;2. School of Advanced Sciences, Kalasalingam Academy of Research and Education, Krishnankoil, Virudhunagar 626128, Tamil Nadu, India;3. Department of Physics, Khadir Mohideen College, Adirampattinam 614701, Tamilnadu, India;4. Research and Development Centre, Bharathiyar University, Coimbatore 641046, Tamilnadu, India;5. UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa;6. Nanosciences African network (NANOAFNET), Materials Research Group (MRG), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa |
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| Abstract: | Nominal stoichiometric hydroxylapatite, Ca10(PO4)6(OH)2 and silicon-substituted HA, containing 0.9 wt% in silicon, were prepared by the ceramic method. The samples were analyzed by elemental chemical analysis, Fourier transformed infrared spectroscopy (FTIR) and the structural study was carried out by Rietveld analysis combining powder X-ray (XRD) and neutron diffraction (ND). The refinements of the occupancies at the 4e Wyckoff position shows that the OH−/O2− ratio is higher when SiO44− substitutes PO43−. The observation of the Fourier maps points out that also the HPO42− formation from PO43− is also higher when Si is included in the HA structure. For the first time, the atomic coordinates for the H atoms of HPO42− anions are provided. |
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