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X‐ray Powder Diffraction and Solid‐State NMR Investigations in Cadmium−Lead Hydroxyapatites
Author(s) -
Badraoui Béchir,
Bigi Adriana,
Debbabi Mongi,
Gazzano Massimo,
Roveri Norberto,
Thouvenot René
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200105)2001:5<1261::aid-ejic1261>3.0.co;2-s
Subject(s) - chemistry , hydroxyapatites , powder diffraction , solid state , x ray crystallography , cadmium , lead (geology) , crystallography , diffraction , organic chemistry , calcium , physics , geomorphology , optics , geology
In the proposed experiment, the maximum amount of cadmium substitution in lead hydroxyapatite accounts for about 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 31 P 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 towards the center of the triangles formed by the site 2 metals has been observed with increasing cadmium content. The different environments of the phosphate group demonstrated by 31 P NMR spectroscopic data are discussed in relation to structural data.