Impact of anionic substitutions on apatite structure and properties

A review of the results of the authors on single and coupled substitutions of F for OH, and of CO3 and SO4 for PO4 in synthetic and natural apatites, their influence on apatite structure and properties, studied by peak fitting FTIR, XRD, TG/DTA and TG/EGA methods, is presented. Calcination of carbonate and sulphate substituted apatites leads to the formation of stable stoichiometric apatite.