مطالعه ابررساناي Bi1.64Pb0.36Sr2Ca2-xCdxCu3O10 ساخته شده به روش سل ژل

Studying synthesized ‎Bi1.64Pb0.36Sr2Ca2-xCdxCu3O10 superconductor properties using the sol-gel method

ابررساناي سراميكي Bi1.64Pb0.36Sr2Ca2-xCdxCu3O10 آلايش يافته با Cd به روش سل ـ ژل ساخته شد. براي تهيه نمونه ها، مقدار آلايش كادميوم از 0/2-0=x و زمان هاي پخت 32، 48، 56 و 64 ساعت انتخاب شدند. براي يافتن دماي شروع واكنش مواد اوليه از ژل خشك شده آناليز TGA گرفته شد. ريخت شناسي و ريزساختار نمونه ها توسط XRD و SEM مورد بررسي قرار گرفت. نتايج حاصل از XRD نشان داد كه بيشترين درصد فاز 2223-Bi ،براي نمونه با مقدار آلايش تا 0/02=x مي باشد. چگالي جريان بحراني و دماي بحراني نمونه ها با استفاده از روش چهارميله اي اندازه گيري شد كه نتايج حاصل از آن ها نشان مي دهد كه در زمان پخت 48 ساعت، نمونه با مقدار آلايش 0/2=x داراي بيشترين چگالي جريان بحراني و دماي بحراني مي باشد.

The sol-gel technique has been used in the preparation of Cd doped Bi1.64Pb0.36Sr2Ca2-xCdxCu3O10 ceramic superconductors. In this study, the value of doping Cd has been varied from x = 0-0.2 at different annealing times (32, 48, 56 and 64h) for preparing samples. To find the temperature of annealing, TGA analysis has been done from dried gel. Analysis of XDR and SEM has been done to study the morphology and microstructur of samples. The results of XRD indicated that the maximum values of the Bi-2223 phase percent was obtained for sample doped with x = 0.02 Cd. Also, the study of SEM images shows that this sample has a plate like structure which is caused increase in the critical current density. The critical current density and the critical temperature of samples have been measured by four-probe method. The results show that the sample which was doped with x = 0.02 has maximum value of percentage of Bi – 2223 phase, critical current density and critical temperature