fa تأثیرآلایش Pb و Sb بر چگالی جریان بحرانی و ریزساختار ابررسانای فاز Bi-2223 نانوفیزیک Special پژوهشي Research <span style="font-family:b nazanin;"><span style="font-size:10pt;">در این مقاله تأثیر آلایش سرب </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">(Pb)</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;"> و آنتیموان </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">&nbsp;(Sb)</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;">برروی </span></span><span style="font-family:b nazanin;"><span style="font-size:10.0pt;">چگالی جریان بحرانی، انرژی فعال&shy;سازی و ریزساختار ابررسانای </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Bi_1.6Pb_xSb_ySr₂Ca₂Cu₃O_y</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;"> گزارش شده است. ابررسانای </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Bi_1.6Pb_xSb_ySr₂Ca₂Cu₃O_y</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;"> به روش واکنش حالت جامد تهیه شد. چگالی جریان بحرانی و انرژی</span></span><span style="font-family:b nazanin;"><span style="font-size:10.0pt;"> فعال&shy;سازی به روش چهار میله&shy;ای اندازه&shy;گیری شد. ریزساختار و ریخت&shy;شناسی نمونه&shy;ها توسط </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">XRD</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10.0pt;">، </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">&nbsp;SEM</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;">و</span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> EDX </span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;">&nbsp;بررسی شده است. نتایج حاصل از الگوهای پراش نشان می&shy;دهند که درصد فاز </span></span><span style="font-family:b nazanin;"><span style="font-size:10.0pt;">2223</span></span><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">&ndash;</span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Bi</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;"> در نمونه&shy;های ابررسانای </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Bi_1.6Pb_xSb_ySr₂Ca₂Cu₃O_y</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;"> با افزایش </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Sb</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;"> تا 05_/0 = </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">x</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;"> و </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Pb</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;"> تا 35_/0 = </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">x</span></span></span><span style="font-family:b nazanin;"><span style="font-size:10pt;"> افزایش می&shy;یابد. در مجموع رابطۀ بین جریان و ولتاژ در ناحیۀ مخلوط برای تمام نمونه&shy;ها از رابط&nbsp; </span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">&nbsp;V </span></span></span><span dir="LTR"><span style="font-family:symbol;"><span style="font-size:10.0pt;">@</span></span></span><span dir="LTR"><span style="font-family:symbol;"><span style="font-size:10.0pt;">a</span></span></span><span dir="LTR"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">I</span></span></span>^{<span dir="LTR"><span style="font-family:symbol;"><span style="font-size:10.0pt;">b</span></span></span>}<span style="font-family:b nazanin;"><span style="font-size:10.0pt;">پیروی می&shy;کند.&nbsp;</span></span> In this paper, the effect of Sb and Pb doping on the critical current density and microstructure of Bi_1.6Pb_xSb_ySr₂Ca₂Cu₃O_z (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 = aI^b. ابررسانای فاز Bi-2223, آلایش Pb و Sb, چگالی جریان بحرانی, ریزساختار, انرژی فعال‌سازی Critical current density, Flux pining energy, SEM, XRD 73 86 http://jmrph.khu.ac.ir/browse.php?a_code=A-10-42-1&slc_lang=fa&sid=1 seyed ebrahim mousavi ghahfarokhi سید ابراهیم موسوی قهفرخی musavi_ebrahim@yahoo.co.uk 100319475328460045 100319475328460045 Yes morteza zargar shoushtari مرتضی زرگر شوشتری 100319475328460046 100319475328460046 No