X-ray powder diffraction and solid-state NMR investigations in cadmium-lead hydroxyapatites

被引:0
|
作者
Badraoui, B
Bigi, A [1 ]
Debbabi, M
Gazzano, M
Roveri, N
Thouvenot, R
机构
[1] Ecole Natl Ingn Monastir, Lab Chim Inorgan & Ind, Monastir 5019, Tunisia
[2] Univ Bologna, Dipartimento Chim G Ciamician, I-40126 Bologna, Italy
[3] CNR, Ctr Studio Fis Macromol, I-40126 Bologna, Italy
[4] Univ Paris 06, Unite CNRS 7071, Lab Chim Inorgan & Mat Mol, F-75252 Paris 05, France
关键词
hydroxyapatite; Rietveld method; P-31 MAS NMR spectroscopy; ionic substitution; X-ray diffraction;
D O I
暂无
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
In the proposed experiment, the maximum amount of cadmium substitution in lead hydroxyapatite accounts for about to 30 atom-%. The crystal structures of PbHA at different degrees of cadmium substitution for lead (4.9, 10.0, 22.4 and 29.0% Cd atoms) have been investigated by X-ray powder pattern fitting and P-31 MAS NMR. The site-occupancy factors of metal atoms clearly indicate a preference of cadmium for site 1 of the apatite structure, which is more selective at low cadmium content. A progressive shift of the OH group wards the center of the triangles formed by the site 2 metalshas been observed with increasing cadmium content. The different environments of the phosphate group demonstrated by P-31 NMR spectroscopic data are discussed in relation to structural data.
引用
收藏
页码:1261 / 1267
页数:7
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