تأثيرآلايش Pb و Sb بر چگالي جريان بحراني و ريزساختار ابررساناي فاز Bi-2223

The effect of Sb and Pb doping on the critical current density and microstructure of the Bi1.6PbxSbySr2Ca2Cu3Oz superconductor

در اين مقاله تأثير آلايش سرب (Pb) و آنتيموان (Sb)برروي چگالي جريان بحراني، انرژي فعال­ سازي و ريزساختار ابررساناي Bi1.6PbxSbySr2Ca2Cu3Oy گزارش شده است. ابررساناي Bi1.6PbxSbySr2Ca2Cu3Oy به روش واكنش حالت جامد تهيه شد. چگالي جريان بحراني و انرژي فعال­سازي به روش چهار ميله ­اي اندازه­ گيري شد. ريزساختار و ريخت­ شناسي نمونه­ ها توسط XRD، SEMو EDX بررسي شده است. نتايج حاصل از الگوهاي پراش نشان مي­دهند كه درصد فاز 2223–Bi در نمونه ­هاي ابررساناي Bi1.6PbxSbySr2Ca2Cu3Oy با افزايش Sb تا 0/05 = x و Pb تا 0/35 = x افزايش مي ­يابد. در مجموع رابطۀ بين جريان و ولتاژ در ناحيه مخلوط براي تمام نمونه ­ها از رابط V @aIbپيروي مي­ كند.

In this paper, the effect of Sb and Pb doping on the critical current density and microstructure of Bi1.6PbxSbySr2Ca2Cu3Oz (BPSSCCO) were studied. The BPSSCCO superconductor was made by a solid state reaction method. The superconductivity properties of Pb- and Sb-doped Bi-based superconductor, such as critical current density, flux pinning energy and microstructure, have been investigated. In order to study the effect of Sb and Pb on the critical current density of the samples, the V-J curves were measured at 77 K temperature. The critical current density of the Sb-doped samples at 77 K temperature increases when the amount of Sb is increased. In addition, for all the samples, the relationship between the current and voltage in the mixed state region is found to follow the model relationship of V = aIb.