Europium-Doped Carbonated Apatites

In this first exploration of europium-doped carbonated apatites the location carbonate was determined using environment model for analysis IR and NMR spectra. Europium-doped apatites, containing Eu/(Eu + Ca) mole ratios about 10%, were prepared by aqueous one-step addition syntheses. The spectra in samples are described model: A-type is assigned to channels only calcium ions (A = Ca6) or one Na+ a vacancy (A’ Ca5Na Ca5). presence channel Eu3+ use triammonium phosphate synthesis produce considerable carbonate. For reported here, distributed approximately 60 40 ratio occupancy versus replacement phosphate. europium assumed have replaced Ca(II) (channel) stoichiometry products used propose that, contrary much Eu(III) substitution literature, charge-balance mechanism likely involve two three ion with concomitant formation vacancy. also correlation a-axial lattice parameter percent