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Recrystallization of Amorphous or Nanocrystalline NdBa2Cu3O7−x and GdBa2Cu3O7−x

Published online by Cambridge University Press:  26 February 2011

T. J. Folkerts ,
S. I. Yoo ,
Youwen Xu ,
M. J. Kramer ,
K. W. Dennis  and
R. W. Mccallum
T. J. Folkerts
Affiliation:
Institute for Physical Research and Technology, Iowa State Univ., Ames, IA
S. I. Yoo
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA
Youwen Xu
Affiliation:
Institute for Physical Research and Technology, Iowa State Univ., Ames, IA
M. J. Kramer
Affiliation:
Institute for Physical Research and Technology, Iowa State Univ., Ames, IA
K. W. Dennis
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA
R. W. Mccallum
Affiliation:
Institute for Physical Research and Technology, Iowa State Univ., Ames, IA Ames Laboratory, Iowa State University, Ames, IA
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Abstract

Using a novel melt-spinning technique, we have produced highly disordered NdBa2Cu3O7−x and GdBa2Cu3Oy−x materials. Samples which were melt-spun in an O2 environment consist of nanocrystals with the tetragonal REBa2Cu3O7−x structure: samples which were processed in an N2 environment consist of an amorphous matrix with small amounts of crystalline BaCu2O2, as shown by x-ray diffraction and electron microscopy. High temperature XRD studies indicate that the BaCu2O2 is eliminated during heating to 500°C in O2 and that the REBa2Cu3O7−x Phase recrystallizes directly from the amorphous matrix at temperatures below 800°C. Preliminary magnetization measurements show that higher temperature heat treatments are needed to restore superconductivity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 335
Copyright
Copyright © Materials Research Society 1992

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