期刊
ACTA BIOMATERIALIA
卷 6, 期 8, 页码 3264-3274出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2010.02.034
关键词
Bioceramics; Silicon substitution; Hydroxyapatite; beta-TCP; Rietveld refinement
资金
- ANR [ANR-09-BLAN-0120-03]
Four samples of composition Ca-10(PO4)(6-x)(SiO4)(x)(OH)(2-x) with x = 0 0, 0 1, 0 2 and 0.5, were prepared and characterized using powder X-ray and neutron powder diffraction, and H-1, P-31 and Si-29 nuclear magnetic resonance (NMR) spectroscopy The composition of the Si-substituted HAp phases was determined by Joint Rietveld refinements from powder X-ray and powder neutron diffraction data. Taking into account electroneutrality, a chemical formula for the Si-substituted HAp phases with indication of the incorporated silicate amount is proposed Solid-state Si-29 NMR confirms the presence of only Q(0) species, in good agreement with the presence of substituted HAp and beta-TCP phases only. Thanks to NMR spectroscopy, two types of protons in the Si-substituted HAp phase were identified, the new site corresponding to species engaged in hydrogen bonding with silicate anions This allowed further refinement of the formulae for these phases with very good quantitative agreement for populations derived from the refinement and integration of NMR data (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved
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