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Structure of ErBa2Cu3Ox in the Composition Range 6.1 < x < 7.0

Published online by Cambridge University Press:  21 February 2011

E. Pörschke ,
P. Meuffels  and
B. Rupp
E. Pörschke
Affiliation:
Institut für Festkõrperforschung, KFA Jülich, D-5170 Jülich, Fed. Rep., Germany
P. Meuffels
Affiliation:
Institut für Festkõrperforschung, KFA Jülich, D-5170 Jülich, Fed. Rep., Germany
B. Rupp
Affiliation:
Institut für Festkõrperforschung, KFA Jülich, D-5170 Jülich, Fed. Rep., Germany Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
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Abstract

The structure of a series of homogeneous ErBa2Cu3Ox powder samples (6.1 < x < 7.0) has been determined by elastic neutron scattering using the Rietveld method of profile refinement. All samples were prepared in the same way using a defined absorption-desorption method.

By removing oxygen the c axis expands, whilst the Cu2–Cu2 and the Ba–Ba distances contract. Accordingly, the most significant changes in atomic distances occur between the Cu2–O2,3 planes and the Cul–O4–Cul chains. With decreasing oxygen content the distance between the Cu–O planes and the Cu–O–Cu chains increases and the oxygen (0, 0, z) apex atom O1 moves closer to the Cu–O–Cu chains withdrawing from the Cu–O planes. The O1–plane and O1–chain distances are monotonic functions of the oxygen content, but the x dependence of these bonding lengths seems to be much stronger below x < 6.5. The change of the interatomic distances can be correlated to the suppression of superconductivity which clearly occurs within the orthorhombic phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 181
Copyright
Copyright © Materials Research Society 1990

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