Preparation, structure and infrared spectrum of NaEuP2O7

Crystals of NaEuP{sub 2}O{sub 7} have been grown by the flux technique and characterized by X-ray diffraction. Single crystal structure of NaEuP{sub 2}O{sub 7} has been solved, for the first time; it crystallizes in the monoclinic P2{sub 1}/n space group with lattice parameters : a = 5.238(2), b = 8.443(4), c = 12.486(6) A, {beta} = 91.404 deg. (2), V = 552.0(4) A{sup 3}, Z = 4. The crystal structure has been refined yielding a final R(F{sup 2}) =0.049 and R{sub w}(F{sup 2}) = 0.138 for 1313 independent reflections (F{sub o}{sup 2} {>=} 2{sigma}(F{sub o}{sup 2})). In this structure, the PO{sub 4} tetrahedral are linked by bridging oxygen to give P{sub 2}O{sub 7} groups, these groups are connected to the EuO{sub 8} polyhedron by sharing two oxygen corners to form three-dimensional framework in which channels are noticed and where the sodium ions are located. The frequencies of the vibrational modes of the crystal were obtained from measurements of the infrared spectra.