Citation: Jerbi, Hasna; Hidouri, Mourad; Glorieux, Benoit; Darriet, Jacques; Garcia, Alain; Jubera, V\'eronique; Ben Amara, Mongi (2010). Synthesis, crystal structure and optical investigation of the new phosphates: Na7Mg13Ln(PO4)12 (Ln=La, Eu). Journal of Solid State Chemistry, 183, pp. 1752-1760.