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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
1994
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Language
en
Pages
16040-16043
Series
Physical Review B, Volume 50, issue 21
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.
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Keywords
Mössbauer spectroscopy, XRD
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Citation
Linden , J , Lippmaa , M , Miettinen , J , Tittonen , I , Katila , T , Karppinen , M & Niinistö , L 1994 , ' 151Eu Mössbauer spectroscopy and x-ray-diffraction studies on the Pb2Ba2EuCu3O8+δ system ' , Physical Review B , vol. 50 , no. 21 , pp. 16040-16043 . https://doi.org/10.1103/PhysRevB.50.16040