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Single-crystal structure refinement of four compounds in the Y1−xPrxBa2Cu3−yAlyO7−δ system

Published online by Cambridge University Press:  31 January 2011

A. Meden ,
E. Holzinger-Schweiger ,
G. Leising ,
S. Pejovnik  and
L. Golič
A. Meden
Affiliation:
Department of Chemistry, University of Ljubljana, Slovenia
E. Holzinger-Schweiger
Affiliation:
Institute of Solid State Physics, Graz University of Technology, Austria
G. Leising
Affiliation:
Institute of Solid State Physics, Graz University of Technology, Austria
S. Pejovnik
Affiliation:
National Institute of Chemistry, Ljubljana, Slovenia
L. Golič
Affiliation:
Department of Chemistry, University of Ljubljana, Slovenia
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Abstract

X-ray single crystal diffraction data were used for structural refinement of the title compounds with different x (0.15, 0.27, 0.49, and 0.89). Crystals were grown in alumina crucibles using the self-flux method. Aluminum, which originates from the crucibles, substitutes only Cu(1), and thus induces tetragonal symmetry which was observed in all four crystals. The main structural effect of praseodymium is an increased separation of superconducting layers. Substituent concentrations (x and y in the formula) have been refined and compared with the values obtained by EDX (energy dispersive x-ray analysis) in an electron microscope. It was indicated that the refined values of Y: Pr ratio and the oxygen content are more reliable than those obtained by EDX while the refinement is less sensitive for Cu(1): Al ratio, and this value is more uncertain. This is in accordance with the result of wet chemical analysis.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 12 , December 1996 , pp. 3000 - 3004
Copyright
Copyright © Materials Research Society 1996

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References

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