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On the Existence of (O2)2- in YBa2Cu3-yMyO7+x, M=Co and Fe

Published online by Cambridge University Press:  28 February 2011

Y. K. Tao ,
J. S. Swinnea ,
A. Manthiram ,
J. S. Kim ,
J. B. Goodenough  and
H. Steinfink
Y. K. Tao
Affiliation:
Center for Materials Science and Engineering, ETC 9.104, The University of Texas, Austin, Texas 78712
J. S. Swinnea
Affiliation:
Center for Materials Science and Engineering, ETC 9.104, The University of Texas, Austin, Texas 78712
A. Manthiram
Affiliation:
Center for Materials Science and Engineering, ETC 9.104, The University of Texas, Austin, Texas 78712
J. S. Kim
Affiliation:
Center for Materials Science and Engineering, ETC 9.104, The University of Texas, Austin, Texas 78712
J. B. Goodenough
Affiliation:
Center for Materials Science and Engineering, ETC 9.104, The University of Texas, Austin, Texas 78712
H. Steinfink
Affiliation:
Center for Materials Science and Engineering, ETC 9.104, The University of Texas, Austin, Texas 78712
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Abstract

The limiting substitution of Co or Fe for Cu in the orthorhombic superconducting phase YBa2Cu3O7−x yields the tetragonal, semiconducting compositions YBa2Cu2CoO7.25 and YBa2Cu2.5Fe0.5O7.19 after annealing at 400°C and slow-cooling in O2. Single-crystal x-ray structural analyses, conductivity and magnetic-susceptibility measurements, and TGA data provide evidence for Co or Fe substitution at the Cu(1) position and intercalation of peroxide ions (O2)2-. The two compositions decompose for disintercala-tion of oxygen beyond O6.7 for M=Co and O6.4 for M=Fe when heated in N2. The Cu(2) atoms of tetragonal YBa2Cu3O6 appear to be antiferromagnetic below a TN = 240 K, which is similar to comparable Cu-O planar nets in stoichiometric La2LnO4.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 519
Copyright
Copyright © Materials Research Society 1988

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References

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