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Co and Fe substitution in YBa2Cu3O7−δ

Published online by Cambridge University Press:  31 January 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, The University of Texas at Austin, Austin, Texas 78712
J. S. Swinnea
Affiliation:
Center for Materials Science and Engineering, The University of Texas at Austin, Austin, Texas 78712
A. Manthiram*
Affiliation:
Center for Materials Science and Engineering, The University of Texas at Austin, Austin, Texas 78712
J. S. Kim
Affiliation:
Center for Materials Science and Engineering, The University of Texas at Austin, Austin, Texas 78712
J. B. Goodenough
Affiliation:
Center for Materials Science and Engineering, The University of Texas at Austin, Austin, Texas 78712
H. Steinfink
Affiliation:
Center for Materials Science and Engineering, The University of Texas at Austin, Austin, Texas 78712
*
a)On leave from Madurai Kamaraj University, Madurai, India.
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Abstract

The limiting substitution of Co or Fe for Cu in the orthorhombic superconducting phase YBa2Cu3O7−δ yields the tetragonal, semiconducting compositions YBa2Cu2CoO7.25 and YBa2Cu2.5 Fe0.5O7.19 after annealing at 400°C and slow cooling in O2. Single-crystal x-ray structural analyses, conductivity and magnetic-susceptibility measurements, and thermogravimetric analysis (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 disintercalation of oxygen beyond O6.7 for Co and O6.4 for Fe when heated in N2. The Cu(2) atoms of tetragonal YBa2Cu4O6 appear to be antiferromagnetic below a Tn ∼ 240 K, which is similar to comparable Cu–O planar nets in stoichiometric La2CuO4.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 2 , April 1988 , pp. 248 - 256
Copyright
Copyright © Materials Research Society 1988

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