ساخت و بررسی تأثیر نانوذرات Au بر چگالی جریان بحرانی و ریزساختار ابررسانای Bi1.6Pb0.4Sr2Ca2Cu3Oy

نویسندگان

دانشگاه شهید چمران

چکیده

در این مقاله، چگونگی ساخت نانوذرات Au به روش محلولی و نیز تأثیر این نانوذرات بر چگالی جریان بحرانی، مقاومت نمونه­ها در دمای اتاق، انرژی فعال­سازی و ریزساختار ابررسانای پایه­ی بیسموت گزارش شده است. چگالی جریان بحرانی، مقاومت نمونه­ها در دمای اتاق و انرژی فعال­سازی به روش چهار میله­ای اندازه­گیری شده­اند. ریزساختار و ریخت­شناسی نمونه­ها نیز با استفاده از XRD و SEM بررسی شدند. نتایج حاصل از الگوهای پراش نشان می­دهند که درصد فاز 2223 –Bi  در نمونه­های ابررسانای Bi1.6Pb0.4Sr2Ca2Cu3Oy با درصد کم نانوذرات طلا (Au = 1%) و زمان پخت 72 ساعت افزایش می­یابد. همچنین در بررسی­های انجام شده روی نمونه­های ساخته شده، مشخص شد که نانوذرات طلا باعث افزایش نسبی چگالی جریان بحرانی و انرژی فعال­سازی می­شوند.

کلیدواژه‌ها


عنوان مقاله [English]

Fabrication and the effect of Au nanoparticles on Bi1.6Pb0.4Sr2Ca2Cu3Oy superconductor

چکیده [English]

In this paper, Au nanoparticles are synthesized by solution method. The effect of these nanoparticles on the Bi1.6Pb0.4Sr2Ca2Cu3Oy superconductor properties has been investigated. The critical current density, activation energy and room temperature resistivity were measured by the standard four-probe method. The microstructure and morphology of samples have been studied by X-ray diffraction, Scanning Electron Microscope and Energy Dispersive X-ray. The results of X-ray diffraction patterns show that the low amount of Au and annealing time of 72h enhance the fraction of Bi -2223 phase. Also crystallography studies showed that the gold has entered the superconductor's structure and the results were in consistency with superconductor's SEM images.

کلیدواژه‌ها [English]

  • Nanoparticles
  • Au
  • critical current density
  • activation energy
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