Preparation and characterization of apatite-like compound

Barium–lanthanum apatites, Ba10-xLax(PO4)6-x(SiO4)xF2,with 0 ≤ x ≤ 6 were prepared by solid state reaction in the temperature range of 1200-1400 °C. The powders were assessed by inductively coupled plasma atomic emission spectroscopy (ICP-AES), F-selective electrode, X-ray diffraction (XRD), Fourier transform infra-red (FTIR), In addition, the present study used thermal analysis to follow the apatite formation reaction during the heat treatment. For x≤3, there is formation of a single apatite phase while above this value, the La2SiO5, La2Si2O7, BaSi2O5 and Ba2La2O5 secondary phases were observed. The variation of the lattice parameters of the apatite phase as a function of x confirmed that the solid solution is discontinuous to either side of x = 3.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author