Properties of Ag-Doped Bi(1.6)Pb(0.4)Sr2Ca3Cu(4-x)AgxOy (2234) Oxides Prepared by S.S.R. Method

Authors : S. Bolat, E. Yanmaz & H. Cömert

Pages : 129-136

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Publication Date : 9999-12-31

Article Type : Makaleler

Abstract :The effect of Ag-doping Bi1.6Pb0.4Sr2Ca3Cu4-xAgxOy compounds (x=0.0-1.0), prepared by conventional Solid-State-Reaction (SSR) technique, was studied using x-ray diffraction (XRD) and electrical resistivity. The high-Tc fraction of the 2223 phase, formed from the nominal composition of 2234, decreases with increasing Ag content. From lattice parameter calculations it follows that Ag-doping the unit cell phase of (Bi,Pb)2Sr2Ca2Cu3Oy is limited to the value of x\leq0.1. The zero resistance critical temperature (Tc,zero) was determined from the resistivity curves for all samples. The value of Tc,zero decreases slightly to 106 K for x\leq0.4 and when the nominal silver content increases up to x=0.7 or more Tc,zero strongly decreases to 72 K. The critical current density Jc at 77 K decreases dramatically as silver content increases. This result is discussed on the basis of precipitation of low-Tc 2212 and other impurity phases in Bi1.6Pb0.4Sr2Ca3Cu4-xAgxOy compounds.
Keywords : Turk. J. Phys., 24, (2000), 129-136. Full text: pdf Other articles published in the same issue: Turk. J. Phys., vol.24, iss.2.