Abstract
Direct determination of rare earth location and local environment in NaYP2O7 are presented. Undoped and Ln-doped NaYP2O7 (Ln=Eu, Ce) were produced via PVA-assisted sol–gel method. Lattice parameters were determined from Rietveld refinement, showing monoclinic structure. XAS results suggested Eu3+ and Ce3+ are incorporated into NaYP2O7 host in substitution to Y3+ site, with first coordination shell formed by six oxygen ions. Measurements at Eu edge showed a single peak in R space for Eu–O distribution. In this case, uniform interatomic distances implied to absence of significant disorder. Analysis at Ce edge presented different behavior, with Ce–O distribution characterized by a split peak in R space. Nearest neighborhood was found to be distributed with Ce occupying an off-center position in Y site. Under X-ray excitation, 5D0→7FJ emission lines of Eu3+ were identified for NaYP2O7:Eu. NaYP2O7:Ce presented a broad emission formed by 5d→2FJ transitions of Ce3+, with the superposition attributed to the effect of distorted oxygen octahedra around the dopant ions.
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