Author:
Chow J.C.L.,Fung P.C.W.,Shao H.M.,Lam C.C.
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.
Publisher
Springer Science and Business Media LLC
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Cited by
10 articles.
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1. Synthesis of High-Tc Superconductor Hg0.8M0.2Ba2Ca2Cu3Oy (M=V, Cr, Mn, Mo, Ag, In, Sn, W, Re, Pb, Hf, Ta) by Quartz-Tube Encapsulation Technique;Journal of the Ceramic Society of Japan;2005
2. Rhenium effect in the formation and stability of HgCaO2 and Hg1−xRexBa2Ca2Cu3O8+δ superconductor;Physica C: Superconductivity;2001-07
3. CRYSTAL STRUCTURE DATA ON A NEW CUBIC PHASE ACTING AS ANTAGONIST IN THE SYNTHESIS OF Hg(Re)-1223 SUPERCONDUCTOR;International Journal of Modern Physics B;2000-10-30
4. A new Cu-free cubic phase as competitor in the synthesis of Hg(Re)-1223 superconductor;Solid State Communications;2000-09
5. Effect of hydrostatic pressure onHgBa2Ca2Cu3O8+δsuperconductor doped with Re;Physical Review B;2000-06-01