Abstract
Strontium-britholites whose chemical formula was Sr
10−
x
La
x
(PO
4)
6−
x
(SiO
4)
x
F
2, where
x=0, 1, 2, and 4 were prepared by solid state reaction. The structural refinement carried out using the Rietveld method indicated that La
3+ ions were located into the two sites with a strong preference for metal (2) sites especially for low contents. A progressive shift of the F
− position along the
c-axis outside the centre of the triangle formed by metal (2)-atoms was observed with the increase of
x. The infrared and Raman spectra exhibited the characteristic vibration modes of PO
4 and SiO
4 groups confirming the incorporation of this last group into the apatite structure. The
29Si MAS-NMR spectra exhibited one resonance peak confirming the data obtained by X-ray diffraction, indicating that P and Si were located in the same crystallographic site.