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Environment of the Eu3+ Ion within Nanocrystalline Eu-Doped BaAl2O4: Correlation of X-ray Diffraction, Mössbauer Spectroscopy, X-ray Absorption Spectroscopy, and Photoluminescence Investigations

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    Environment of the Eu3+ Ion within Nanocrystalline Eu-Doped BaAl2O4: Correlation of X-ray Diffraction, Mössbauer Spectroscopy, X-ray Absorption Spectroscopy, and Photoluminescence Investigations
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    † †Division of Materials Physics and §Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, P.O. Box 180, HR-10002 Zagreb, Croatia
    ‡ Fk. 4, Physik, Bergische Universität Wuppertal, Gauss-Straße 20, D-42097 Wuppertal, Germany
    ∥ Department of Chemistry, Faculty of Science, Toho University, Chiba 274-0072, Japan
    ⊥ Department of Physical Chemistry, Plovdiv University “Paisii Hilendarski”, Tsar Asen Str. 24, 4000 Plovdiv, Bulgaria
    # Institute of Physics, Bijenička cesta 46, P.O. Box 304, HR-10002 Zagreb, Croatia
    *E-mail: [email protected] (B.G.). Tel.: +385 1 3873075. Fax: +385 1 4680114.
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    Inorganic Chemistry

    Cite this: Inorg. Chem. 2018, 57, 4, 1744–1756
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    https://doi.org/10.1021/acs.inorgchem.7b02322
    Published February 8, 2018
    Copyright © 2018 American Chemical Society
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    Abstract

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    Powder samples of pure BaAl2O4 and doped with 4.9 atom % Eu in relation to Ba were prepared by a hydrothermal route. The samples were characterized by X-ray diffraction, 151Eu Mössbauer spectroscopy, synchrotron-based X-ray absorption spectroscopy at the Ba L3- and Eu L3-edges, and photoluminescence measurements. Diffraction lines were broadened, indicating that the samples were nanocrystallline. The samples possessed a hexagonal crystal structure, space group P63. 151Eu Mössbauer spectroscopy revealed the presence of Eu in the 3+ oxidation state. The same information on the Eu oxidation state was also obtained by the Eu L3-edge X-ray absorption near-edge structure of the doped sample. Extended X-ray absorption fine structure showed an Eu3+ ion substituted for Ba2+ on the Ba2 site in the BaAl2O4 host structure, with charge compensation by an interstitial O in the vicinity of the Ba2 site. That was confirmed by a Rietveld structure refinement for the Eu-doped BaAl2O4 sample. Analysis of the diffraction line broadening for the prepared samples was performed simultaneously with the structure refinement. Both the dopant Eu3+ and the interstitial O acted as defects in the host BaAl2O4 lattice, which increased the lattice strain from 0.02% for pure BaAl2O4 to 0.17% for the Eu-doped sample. Crystallite sizes in the samples increased with Eu doping from 32 nm for pure BaAl2O4 to 36 nm for Eu-doped BaAl2O4. This could likely be related to the increase in the diffusion rate of the cations in the sample when a part of the Ba2+ cation content was exchanged with smaller Eu3+ cations. The Eu-doped BaAl2O4 sample exhibited red photoluminescence under excitation with λexc = 308 nm. The observed emission spectrum indicated that Eu3+ ions occupied the Ba site with lower symmetry in the doped sample.

    Copyright © 2018 American Chemical Society

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    Inorganic Chemistry

    Cite this: Inorg. Chem. 2018, 57, 4, 1744–1756
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.inorgchem.7b02322
    Published February 8, 2018
    Copyright © 2018 American Chemical Society
    Request reuse permissions

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