Abstract
New Pb1-3x⌷xGd2x(MoO4)1-3x(WO4)3x (0<x≤0.1774) and Pb1-3x⌷xGd2xWO4 (0<x≤0.1154, ⌷ denotes vacancy) solid solutions were synthesized via solid state reaction route and citrate-nitrate combustion method. XRD and SEM data showed that as-prepared ceramics crystallize in the tetragonal scheelite type symmetry (space group I41/a) with the crystallite size varying between ~10 and ~40µm (solid state method) or ~500nm and 2µm (combustion synthesis). A change in lattice constants (a and c), lattice parameter ratio c/a and progressive deformation of MoO4/WO4 tetrahedra with an increase of Gd content was observed. The melting point of each Gd-doped sample is lower than the melting point of adequate scheelite matrix. Ceramics under study are insulators with indirect band gap (Eg)>3eV. EPR investigation revealed a difference among spectra obtained for varied gadolinium content, whereas synthesis method has no influence on EPR results.
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