KIM, Ka-Young; CHUNG, U-Chan; MUTULET, Brice; WEILL, François; DEMOURGUES, Alain; ROSSIT, Julie; HEINTZ, Jean-Marc; VEILLERE, Amélie; JUBERA, Veronique

doi:10.1021/acs.inorgchem.7b00088

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KIM, Ka-Young
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CHUNG, U-Chan
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

MUTULET, Brice
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Inorganic Chemistry. 2017, vol. 56, n° 8, p. 4495-4504

American Chemical Society

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The defective fluorite-related Y3NbO7 host lattice was doped with Eu(3+) ions to understand the influence of spark plasma sintering (SPS) process on this host lattice. The intrinsic disorder due to the occurrence of oxygen vacancies results in amorphous-type responses of the luminescent cations, and the spectral distribution varies as a function of the niobium content. Two spectral fingerprints of europium emissions were clearly enhanced. The correlation between luminescence, X-ray diffraction, and electron diffraction characterizations shows the existence of local inhomogeneity. Indeed, the particular nonequilibrium sintering conditions allowed pointing out a lack of miscibility within the Y3NbO7 solid solution domain. Thus, the SPS pellet is a composite of two extreme compositions. This phase demixing is mainly induced by the pressure coupled with a current effect that makes possible ionic migration in this Y3NbO7 ionic conductive matrix.< Réduire

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Tailoring the Composition of Eu(3+)-Doped Y3NbO7 Niobate: Structural Features and Luminescent Properties Induced by Spark Plasma Sintering.

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