Structural, magnetic and luminescent characteristics of Pr 3+ -doped ZrO 2 powders synthesized by a sol–gel method (original) (raw)

Abstract

The structural, magnetic and luminescence properties of praseodymium-doped zirconia powders of compositions Pr 0.03 Zr 0.97 O 2 and Pr 0.05 Zr 0.95 O 2 synthesized by a sol-gel process have been investigated. X-ray diffraction patterns indicate that these materials crystallize in a tetragonal fluorite-type structure. Scanning electron microscopy shows that the powders exhibit an agglomerated microcrystalline structure and the grain size may be in the order of 5-20 µm. The study of the magnetic properties of these doped metal oxides indicates a Curie-Weiss behaviour in the temperature range (100-300) K that allow us to estimate an effective magnetic moment of 3.51 µ B , which indicates the presence of Pr 3+ in the grown samples. Cathodoluminescence spectra recorded at temperatures between 85 and 295 K show emission peaks that can be attributed to transitions between different states within the 4f 2 configuration of Pr 3+ ions incorporated in the zirconia crystal lattice. Thermoluminescence measured at temperatures ranging from 373 to 773 K and at 550 nm wavelength show an intense and broad peak around 653 K for the Pr-doped zirconia which is not observed in the undoped material.

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