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Investigation of Zr nanoparticle effects on structural phase stability, micro strains, and flux pinning in BSCCO-Zr/Cu doped HTSC | ||
Journal of Interfaces, Thin Films, and Low dimensional systems | ||
دوره 5، شماره 2، اردیبهشت 2022، صفحه 479-492 اصل مقاله (1.85 M) | ||
نوع مقاله: Original Article | ||
شناسه دیجیتال (DOI): 10.22051/jitl.2023.42264.1076 | ||
نویسندگان | ||
Vahid Daadmehr* ؛ Fatemeh Shahbaz Tehrani؛ Sadaf Vafajoo | ||
Magnet&Superconducting Research Lab., Faculty of Physics, Alzahra University, Tehran 19938, Iran | ||
چکیده | ||
In this research, the resistivity of the Bi1.66Pb0.34Sr2Ca2Cu3-xZrxO10+δ (Bi-2223) polycrystalline samples (x=0.0, 0.002, 0.0075, and 0.01) synthesized by the sol-gel method, has been investigated under magnetic fields. Also, the structural and morphological properties of ceramic superconductors have been studied by using Xray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) measurements. It is found that the Bi-2223 structural phase was formed more than other phases in the synthesized samples for x≤0.0075. Based on the resistivity measurements, it is understood that the TC decreases with the increase in the Zr doping and the second superconducting transition is seen for the x≥0.0075. The thermally activated flux creep (TAFC) model has been investigated in synthesized ceramic superconductors. Furthermore, the magneto resistivity behavior of all samples has been analyzed to determine the dependence of the pinning energy with applied magnetic fields and Zr doping. It is found that the pinning energy remarkably decreases with the rise of the Zr doping. Therefore, the creeping of vortices and crossing the energy barrier occur more easily, thus the pinning energy is reduced by increasing the Zr doping. Moreover, a good agreement between the modified TAFC model and the experimental data is concluded for the synthesized compounds. | ||
کلیدواژهها | ||
High TC-superconductors؛ micro strain؛ Structural Phase Stability؛ flux pinning and creep؛ X-ray diffraction | ||
عنوان مقاله [English] | ||
بررسی اثرات نانو ذرات Zr بر پایداری فاز ساختاری، میکرو استرین ها، و میخکوبی شار در ابررسانای دمای بالای BSCCO آلاییده با Zr/Cu | ||
نویسندگان [English] | ||
وحید دادمهر؛ فاطمه شهباز طهرانی؛ صدف وفاجو | ||
آزمایشگاه تحقیقاتی ابررسانا و مغناطیس، دانشکده فیزیک، دانشگاه الزهرا | ||
چکیده [English] | ||
در این تحقیق، مقاومت نمونههای پلی کریستالی BSCCO (Bi-2223) (x=0.0، 0.002، 0.0075 و 0.01) سنتز شده به روش سل-ژل تحت میدان مغناطیسی مورد بررسی قرار گرفته است. همچنین، خواص ساختاری و مورفولوژیکی ابررساناهای سرامیکی با استفاده از اندازهگیریهای پراش پرتو ایکس (XRD) و میکروسکوپ الکترونی روبشی انتشار میدانی (FESEM) مورد بررسی قرار گرفته است. مشخص شد که فاز ساختاری Bi-2223 بیش از سایر فازها در نمونه های سنتز شده برای x≤0.0075 تشکیل شده است. بر اساس اندازهگیریهای مقاومت، مشخص میشود که TC با افزایش دوپینگ Zr کاهش مییابد و دومین انتقال ابررسانا برای x≥0.0075 دیده میشود. مدل خزش شار فعال شده حرارتی (TAFC) در ابررساناهای سرامیکی سنتز شده بررسی شده است. علاوه بر این، رفتار مقاومت مغناطیسی همه نمونه ها برای تعیین وابستگی انرژی پینینگ با میدان های مغناطیسی اعمال شده و دوپینگ Zr مورد تجزیه و تحلیل قرار گرفته است. دریافتیم که انرژی پینینگ با افزایش دوپینگ Zr بطور قابل ملاحظه ای کاهش می یابد. بنابراین خزش گردشاره ها و عبور از سد انرژی با سهولت بیشتری رخ می دهد و بنابراین انرژی پینینگ با افزایش دوپینگ Zr کاهش می یابد. علاوه بر این، توافق خوبی بین مدل TAFC اصلاح شده و دادههای تجربی برای ترکیبات سنتز شده به دست آمده است. | ||
کلیدواژهها [English] | ||
ابررسانای دمای بالا, میکرواسترین, پایداری فاز ساختاری, خزش و میخکوبی شار, پراش اشعه X | ||
مراجع | ||
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