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Formation of NdBa2Cu3O7−δ amorphous phase by combining aero-acoustic levitation and splat quenching

Published online by Cambridge University Press:  31 January 2011

K. Nagashio ,
W. H. Hofmeister ,
D. E. Gustafson ,
A. Altgilbers ,
R. J. Bayuzick  and
K. Kuribayashi
K. Nagashio*
Affiliation:
Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
W. H. Hofmeister
Affiliation:
Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
D. E. Gustafson
Affiliation:
Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
A. Altgilbers
Affiliation:
Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
R. J. Bayuzick
Affiliation:
Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
K. Kuribayashi
Affiliation:
Institute of Space and Astronautical Science, 3-3-1, Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan
*
Address all correspondence to this author. e-mail: nagashio@materials.isas.ac.jp
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Abstract

Small spherical samples (diameter approximately 2 mm) of NdBa2Cu3O7−δ (Nd123) were fully melted in Ar gas flow in an aero-acoustic levitation device and subsequently rapidly cooled by splat quenching. For samples quenched above the liquidus, the microstructual and x-ray-diffraction (XRD) observations suggested the existence of the amorphous phase with small quantities of the BaCuO2 and BaCu2Ox. The high-temperature XRD results indicated that the decomposition of the amorphous phase, probably assisted by atmospheric CO2 and H2O, led to formation of the BaCO3 phase at 400 °C and, subsequently, the Nd123 phase was formed by the solid diffusion above 800 °C. Another set of Nd123 samples was fully melted in O2 gas flow, undercooled while levitated, and then splat quenched at a temperature below the peritectic temperature (TP). These samples possessed a microcrystalline microstructure of the Nd123 phase that was confirmed by XRD. This indicated that the Nd123 phase was solidified directly from the undercooled melt quenched below TP.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 1 , January 2001 , pp. 138 - 145
Copyright
Copyright © Materials Research Society 2001

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