151Eu Mössbauer spectroscopy and x-ray-diffraction studies on the Pb2Ba2EuCu3O8+δ system

J. Linden, M. Lippmaa, J. Miettinen, I. Tittonen, T. Katila, M. Karppinen, L. Niinistö

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    Abstract

    Simultaneous replacement of Sr by Ba and Y by Eu in the Pb-2213 system was found to yield single-phase Pb2Ba2EuCu3O8+δ samples, suitable for 151Eu Mössbauer measurements. The samples were synthesized by a solid-state reaction of metal oxides and carbonates under an inert atmosphere. An oxygen-rich sample corresponding to δ=1.79 was obtained by annealing the as-synthesized material (δ=0.16) in oxygen. The oxygen annealing increased the size of the lattice constants and led to an orthorhombic-to-tetragonal phase transition of the structure. The samples were also oriented in an 11.7-T magnetic field. The x-ray-diffraction spectra showed that the c axes tended to orient perpendicular to the applied field. The measured Mössbauer spectra exhibited an electric quadrupole interaction typical of the Eu site in high-Tc cuprates. The average orientation angles obtained from fittings of the Mössbauer spectra were in accordance with the results from the x-ray-diffraction measurements.
    Original languageEnglish
    Pages (from-to)16040-16043
    JournalPhysical Review B
    Volume50
    Issue number21
    DOIs
    Publication statusPublished - 1994
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Mössbauer spectroscopy
    • XRD

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