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Structural Phase Diagram and Superconducting Behavior of the Ba1-Xkxbio3 System

Published online by Cambridge University Press:  28 February 2011

J. D. Jorgensen ,
Shiyou Pei ,
D. G. Hinks ,
B. Dabrowski ,
D. R. Richards ,
A. W. Mitchell ,
Y. Zheng ,
D. T. Marx ,
S. K. Sinha  and
J. M. Newsam
...Show all authors
J. D. Jorgensen
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
Shiyou Pei
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
D. G. Hinks
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
B. Dabrowski
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
D. R. Richards
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
A. W. Mitchell
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
Y. Zheng
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
D. T. Marx
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
S. K. Sinha
Affiliation:
Corporate Research Laboratories, Exxon Research and Engineering Co., Annandale, NJ 08801
J. M. Newsam
Affiliation:
Physics Department, Brookhaven National Laboratory, Upton, NY 11973
D. Vaknin
Affiliation:
Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104
A. J. Jacobson
Affiliation:
Physics Department, Brookhaven National Laboratory, Upton, NY 11973
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Abstract

We have determined the crystal structures of five phases in the Bal-xKxBiO3 system for 0≤x≤0.5 and 10K≤T≤473K. Superconductivity occurs only in a cubic perovskite phase with the maximum Tc at the transition to an orthorhombic, Ibmm, phase. The commensurate structure of this orthorhombic phase, which involves only tilting of the Bi06 octahedra, provides no explanation for its non-metallic behavior. However, an incommensurate structural modulation, observed by electron diffraction, may provide a rationalization. Thus, the maximum Tc at the phase boundary may result from competition between superconductivity and a charge density wave. Further studies of the phase diagram at high temperatures, where controlled oxygen atmospheres are required, reveal an unusual reentrant formation of a potassium-containing impurity phase which explains the need for synthesis techniques that involve initially reacting in a reducing atmosphere, followed by oxygenation at lower temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 145
Copyright
Copyright © Materials Research Society 1990

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