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Yttrium enrichment and improved magnetic properties in partially melted Y-Ba-Cu-O materials

Published online by Cambridge University Press:  31 January 2011

Hamid Hojaji ,
Aaron Barkatt ,
Karen A. Michael ,
Shouxiang Hu ,
Arthur N. Thorpe ,
Matthew F. Ware ,
Inna G. Talmy ,
Debbie A. Haught  and
Sidney Alterescu
Hamid Hojaji
Affiliation:
The Catholic University of America, Washington, DC 20064
Aaron Barkatt
Affiliation:
The Catholic University of America, Washington, DC 20064
Karen A. Michael
Affiliation:
The Catholic University of America, Washington, DC 20064
Shouxiang Hu
Affiliation:
The Catholic University of America, Washington, DC 20064
Arthur N. Thorpe
Affiliation:
Department of Physics, Howard University, Washington DC 20059
Matthew F. Ware
Affiliation:
Department of Physics, Howard University, Washington DC 20059
Inna G. Talmy
Affiliation:
Naval Surface Warfare Center, Silver Spring, Maryland 20910
Debbie A. Haught
Affiliation:
Naval Surface Warfare Center, Silver Spring, Maryland 20910
Sidney Alterescu
Affiliation:
National Air and Space Administration, Goddard Space Flight Center, Greenbelt, Maryland 20771
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Abstract

Samples of Y-Ba-Cu-O materials with the formulation Y:Ba:Cu = x:2:3 and values of x ranging between 1 and 3 were prepared by partial melting at a maximum temperature of 1045 °C. Measurements of magnetic susceptibility and maximum (low-field) as well as remanent magnetization show highest values for x = 2. XRD and SEM/EDX analyses show that the corresponding structure involves numerous small crystals of Y2BaCuO5 (211) embedded in highly ordered assemblages of continuous YBa2Cu3O7−y (123) layers. The presence of these impurity sites is correlated with flux pinning capacity. Other impurity phases include CuO, a minor phase which shows an increase in amount when x increases, BaCuO3, a possibly detrimental minor phase which vanishes when x is raised from 1 to 2, and zones of intermediate composition between the 211 grains and the 123 layers, which are formed from the residual liquid upon cooling. These intermediate regions, like the 211 grains themselves, become gradually more important when x is increased from 1 to 3.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 4 , April 1990 , pp. 721 - 730
Copyright
Copyright © Materials Research Society 1990

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