Vibrational study and fluorescence bands in the FT-Raman spectra of Ca10-xPbx(PO4)(6)(OH)(2) compounds

About 40 apatitic compounds, stoichiometric or not, with different substitu tions like lead, sodium and cadmium were investigated using infrared, Raman and FT Raman spectroscopies. In the Ca10-xPbx(PO4)(6)(OH)(2) sequence (x r uns from 0 to 10), the evolution of the fluorescence bands observed by FT-R aman, only with stoichiometric apatites, is mainly regarded and explained. Important spectral changes concerning the OH- and the PO43- entities occur when 4 less than or equal to x less than or equal to 7. The intensity ratio of the two components of the v(1) PO43- mode is shown to be a suitable met hod to determine the lead content. The weak OH...O hydrogen bonds involving the OH- ions, of which the disorder is discussed, are different for the le ad and calcium hydroxyapatites. The evolution of the fluorescence bands, as well as the splitting of the v(ON) mode, are due to the lead distribution in the two sites, with a preference for sites II, of the hydroxyayatite str ucture. The effect of temperature is also reported. (C) 2001 Elsevier Scien ce B.V. All rights reserved.