Synthesis and Structural Studies of Sol Gel Processed Nanopowders of Lead Doped Y2Ti2O7 Pyrochlores

M. M. Yahyaoui(1*), K. Limame(2), B. Jaber(3), A. Elghazouali(4), S. Sayouri(5)

(1) Laboratory of Physics, Theoretical and Applied, FSDM B.P. 179, Fez, Morocco
(2) Laboratory of Physics, Theoretical and Applied, FSDM B.P. 179, Fez, Morocco
(3) Laboratory of Physics, Centre Régional des Metiers de l’éducation et de la formation(CRMEF) de Fès, Street Kuwait , BP 49 Fès, Morocco
(4) National Center for Scientific Research (CNRS), Angle Avenue Allal El Fassi avenue des FAR , Quartie Hay Ryad, Morocco
(5) The Laboratory of Condensed Matter, FST Street Immouzar, Morocco
(*) Corresponding author


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Abstract


Pyrochlore-type lead doped yttrium titanate (Y2Ti2O7) nanoparticules were successfully synthesized by a sol gel method through the destabilization of colloidal solution (DCS) at a relatively low  temperature. The as-preparation samples were characterized using X-ray diffraction (XRD), Fourier-transform-Infrared spectroscopy (FT-IR) and Raman spectroscopy. The results show that doping with 10% of Pb2+ does not bring any structural change, however further Pb-doping ( 20% ≤ x ≤40% ) leads to formation of Y2Ti2O7 phase along with PbTiO3 phase, which indicates that the limit of solubility of Pb2+ in Y2Ti2O7 is  under 20%. The evaluated experimental value of this limit agrees with that calculated from the limiting radii ratio stabilization of the pyrochlore structure A2B2O7.
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Keywords


Sol-Gel Process; Pyrochlores Doping; Yttrium Titanate; XRD; Raman; FTIR

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