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High-temperature phase relationships for YxNd1–xBa2Cu3Oy(0.7 ≤ x ≤ 1.0) superconductors via containerless processing

Published online by Cambridge University Press:  31 January 2011

J. R. Olive ,
W. H. Hofmeister ,
R. J. Bayuzick  and
M. Vlasse
J. R. Olive
Affiliation:
Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
W. H. Hofmeister
Affiliation:
Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
R. J. Bayuzick
Affiliation:
Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
M. Vlasse
Affiliation:
Space Sciences Laboratory, George C. Marshall Space Flight Center, Huntsville, Alabama 35812
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Abstract

Drop-tube experiments have been performed on YxNd1–xBa2Cu3Oy (0.7 ≤ x ≤ 1.0) to understand the effects of partial substitutions of Nd for Y on the phase relationships in these systems at elevated temperatures. Powders 50–100 μm in diameter were processed in pure O2 at furnace temperatures of 1575–1800 °C, every 25 °C. The resulting samples were examined microstructurally by scanning electron microscopy, energy dispersive spectroscopy, and optical microscopy. Powder x-ray diffraction was performed for phase identification. It was found that Nd substitution alters phase selection by introducing at least one new phase and allowing for solidification of the superconducting composition directly from the melt via undercooling to below the peritectic transformation temperature. A decreasing trend in the overall melting temperature with increasing Nd was also identified.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 10 , October 1999 , pp. 3843 - 3850
Copyright
Copyright © Materials Research Society 1999

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