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Structural and superconducting properties of melt-grown Y–Ba–Cu–O superconductors

Published online by Cambridge University Press:  31 January 2011

R. Gopalan
Affiliation:
Defence Metallurgical Research Laboratory, Hyderabad 500 258, India
T. Rajasekharan
Affiliation:
Defence Metallurgical Research Laboratory, Hyderabad 500 258, India
T. Roy
Affiliation:
Defence Metallurgical Research Laboratory, Hyderabad 500 258, India
G. Rangarajan
Affiliation:
Department of Physics, Indian Institute of Technology, Madras 600 036, India
V. Ganesan
Affiliation:
Inter University Consortium for DAE facilities, University Campus, Khandwa Road, Indore 452001, India
R. Srinivasan
Affiliation:
Inter University Consortium for DAE facilities, University Campus, Khandwa Road, Indore 452001, India
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Abstract

YBa2Cu3O7 (123) samples with varying Y2BaCuO5 (211) concentrations (0 mol%, 20 mol%, 28 mol%, and 50 mol%) were synthesized by the melt-growth process. Microstructural characterizations were done using x-ray diffraction (XRD), optical microscopy, scanning electron microscopy, and transmission electron microscopy (TEM). It was found that 123 platelet width, crack width between the platelets, and 211 particle size decreased systematically with increasing 211 concentration. TEM study showed that there is a critical radius of curvature (rc ≤ 0.2 μm-0.3 μm) of the 123/211 interface where defects/contrasts of strain field start to appear, and these defects are believed to be responsible for pinning the magnetic flux. Microhardness measurements showed that Vickers hardness (VHN) increases with increasing 211 content. Critical current density (Jc) values obtained from magnetization measurements using a SQUID magnetometer were found to increase in melt-grown samples by the addition of 211 content.

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Copyright
Copyright © Materials Research Society 1996

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