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Texture and chemical composition analyses on the Hg0.66Pb0.33Ba2Ca2Cu3Oy superconductor using the sealed quartz tube technique

Published online by Cambridge University Press:  31 January 2011

J.C.L. Chow ,
P.C.W. Fung ,
H.M. Shao  and
C.C. Lam
J.C.L. Chow
Affiliation:
Physics Department and Centre for Materials Science, University of Hong Kong, Hong Kong
P.C.W. Fung
Affiliation:
Physics Department and Centre for Materials Science, University of Hong Kong, Hong Kong
H.M. Shao
Affiliation:
Physics Department, National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, China
C.C. Lam
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
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Abstract

Pb-substituted Hg-based superconductor of Hg0.66Pb0.33Ba2Ca2Cu3Oy has been fabricated using the sealed quartz tube technique. R- and x-ray diffraction pattern (XDP) measurements show that the specimen has a Tc of 135 K and contains mainly the Hg-1223 phase. Scanning electron microscopy/energy dispersive x-ray analysis (SEM/EDX) and transmission electron microscopy/energy dispersive x-ray analysis (TEM/EDX) were employed to study the texture and chemical composition of the specimen. It is found that the specimen contains round-shaped grains with a mixture of Hg-1223, BaCuO2, and Ca0.85CuO2 phases, square-shaped grains with a formula of PbBa2O3, small single crystals with single Hg-1223 phase, and crystal-like layers with a mixture of Hg-1223 and BaCuO2 phase. We consider that though the doping of Pb can benefit the stabilization of the Hg-1223 phase, it introduces other impurity phases and textures in the specimen at the same time.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 6 , June 1996 , pp. 1367 - 1372
Copyright
Copyright © Materials Research Society 1996

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