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Crystal Chemistry and Sub-Solidus Phase Relations in (La,Re)2CuO4 Systems

Published online by Cambridge University Press:  28 February 2011

Joseph F. Bringley ,
Steven S. Trail ,
Michael McElfresh  and
Bruce A. Scott
Joseph F. Bringley
Affiliation:
IBM Research Division, Thomas J. Watson Research Center Yorktown Heights, NY 10598
Steven S. Trail
Affiliation:
IBM Research Division, Thomas J. Watson Research Center Yorktown Heights, NY 10598
Michael McElfresh
Affiliation:
IBM Research Division, Thomas J. Watson Research Center Yorktown Heights, NY 10598
Bruce A. Scott
Affiliation:
IBM Research Division, Thomas J. Watson Research Center Yorktown Heights, NY 10598
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Abstract

La2‐xRExCuO4 (RE = Nd‐Y) solid solution systems have been investigated to determine the factors stabilizing the T (La2CuO4), T’ (Nd2CuO4) and hybrid T*‐type structures. A simple ionic model with a perovskite‐like tolerance factor is found to accurately define the existence field of each. Metastable T* phases are observed for the larger RE cations Nd, Gd, Eu. The structure is quite stable for RE = Dy, Tb, but does not occur at all for the smallest rare earths. Oxygen activity plays a role in T’ and T* phase formation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 53
Copyright
Copyright © Materials Research Society 1990

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