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Non-Stoichiometry and Complex Defects in the Structure of R-Ba-Cu-O Single Crystals Determined by Neutron Diffraction

Published online by Cambridge University Press:  28 February 2011

P. Schweiss ,
Ph. Galez ,
G. Collin  and
F. Marucco
P. Schweiss
Affiliation:
Laboratoire Léon Brillouin, C.E.N.Saclay, 91191 Gif sur Yvette France Kernforschungszentrum Karlsruhe, INFP, D-7500 Karlsruhe and Institut für Mineralogie, Lahnberge, D-3550 Marburg/Lahn F.R.G.
Ph. Galez
Affiliation:
C.P.C.M., DPhG, C.E.N.Saclay, 91191 Gif sur Yvette, France
G. Collin
Affiliation:
C.P.C.M., DPhG, C.E.N.Saclay, 91191 Gif sur Yvette, France Laboratoire de Physique des solides, U.R.A. 02 C.N.R.S., Bt. 510, Université Paris-Sud, 91405 Orsay, France
F. Marucco
Affiliation:
Laboratoire des Solides non-stocchiométriques, Bt 415, Université Paris-Sud, 91405 Orsay, France
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Abstract

The crystal structure of several RBa2Cu3-yO6+z (R=Y,Ho) crystals are investigated by neutron diffraction using an exact solution for the twinned orthorhombic samples. For an oxygen concentration >0.35 in the chains, the structure is orthorhombic due to an exclusive occupancy of the 0(4) site. A systematic and variable copper deficiency is observed on the Cu(l) site leading to a correlated defect on the chain oxygen O(4) and on the bridging oxygen O(l). Due to the presence of these defects, a transverse disorder is observed for the highest oxygen content with a residual occupancy of the forbidden O(5) site.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 205
Copyright
Copyright © Materials Research Society 1990

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