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- W2519227907 endingPage "115501" @default.
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- W2519227907 abstract "Ca0.5Zr2(PO4)3 and Ca0.45Eu0.05Zr2(PO4)3 nanophosphors have been synthesized by a sol–gel process under acid and basic conditions. In order to achieve the reduction of Eu3+ to Eu2+, europium-doped samples were treated in a reducing atmosphere flow. The effects of the different synthesis conditions and the partial substitution of calcium by europium ions on the structure of the samples were analyzed by x-ray diffraction (XRD) transmission electron microscopy (TEM) and micro-Raman spectroscopy. Luminescence and magnetic properties were investigated by photoluminescence (PL) spectroscopy and magnetic susceptibility measurements. XRD patterns can be indexed to a rhombohedral symmetry of space group R-3 with Z = 6, consistent with a NASICON-type structure. A higher crystallinity was found in the samples prepared under basic conditions. TEM images of all the synthesized samples show spherically shaped particles. A broadening of the Raman bands as a result of non-equivalent vibrations of the orthophosphate groups is observed for samples prepared under acid conditions. The same effect was found when calcium is substituted by europium into the Ca0.5Zr2(PO4)3 host. PL spectra exhibit strong emission in the blue-green spectral range due to Eu2+ 4f65d1-4f7 transitions and no evidence of Eu3+ emission. Magnetic measurements confirm the 2+ oxidation state of europium ions in all samples." @default.
- W2519227907 created "2016-09-23" @default.
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- W2519227907 date "2016-02-11" @default.
- W2519227907 modified "2023-10-16" @default.
- W2519227907 title "Preparation of Ca<sub>0.5</sub>Zr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>and Ca<sub>0.45</sub>Eu<sub>0.05</sub>Zr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>nanopowders: structural characterization and luminescence emission study" @default.
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- W2519227907 doi "https://doi.org/10.1088/0022-3727/49/11/115501" @default.
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