STRUCTURAL AND LUMINESCENT PROPERTIES OF EU3-17.33(BO3)(4)(B2O5)(2)O-16( DOPED GD)

Crystal structure of gadolinium berate Gd-17.33(BO3)(4)(B2O5)(2)O-16 h as been refined by the Rietveld method from X-ray powder diffraction d ata. Gd-17.33(BO3)(4)(B2O5)(2)O-16 crystallizes in the monoclinic spac e group Cm with lattice constants a=1841.70(3), b= 374.08(1),c=1419.30 (3)pm and beta=119.85(1)degrees. The structure contains two types of b orate groups BO33- and B2O54-, and nine independent gadolinium atoms. IR; Raman and HREM studies supported the presence of these two differe nt berate groups in the structure. The luminescent spectra of the EU3 doped material consist of several sharp lines originating from the op tical transition's within the f(6) configuration of the EU3+ ions at d ifferent cation sites.