اندازهﮔﯿﺮی ﭘﺬﯾﺮﻓﺘﺎری مغناطیسی متغیر (AC) درابررسانای دمای ﺑﺎﻻی YBCO آﻻﯾﯿﺪه با نانوذرات نقره

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه فیزیک دانشکده علوم دانشگاه آزاد اسلامی واحد شیراز

2 گروه فیزیک، (دانشکده علوم، کشاورزی و فن آوری های نوین)، واحد شیراز، دانشگاه ازاد اسلامی، شیراز، ایران

چکیده

در این ﭘﮋوﻫﺶ ﭘﺬﯾﺮﻓﺘﺎری مغناطیسی AC در ابررسانای دمای ﺑﺎﻻی YBCO آﻻﯾﯿﺪه شده با نانوذرات نقره ﻣﻮرد ﺑﺮرﺳﯽ قرار ﮔﺮﻓﺖ. ابررسانای دمای ﺑﺎﻻی YBCO با درصدهای وزنی آﻻﯾش ۰۰/۰x=، ۰۶/۰x=، ۱۰/۰x= و ۳۰/۰x= ﺑﺎ اﺳﺘﻔﺎده از روش واﮐﻨﺶ حالت ﺟﺎﻣﺪ ﺳﺎﺧﺘﻪ شد. آﻧﺎﻟﯿﺰ  XRD نمونه‌ها فاز ارﺗﻮروﻣﺒﯿﮏ ابررسانا و ﺗﻘﺎرن ﮔﺮوه ﻓﻀﺎیی Pmmm را نشان دادﻧﺪ. تحلیل ﺗﺼﺎوﯾﺮ میکروسکوپ الکترونی روﺑﺸﯽ (SEM) مربوط به ﻣﻮرﻓﻮﻟﻮژی ﺳﻄﺤﯽ مواد ابررسانای خالص  Y123 و آلایش  یافته  با نانوذرات نقره (Y123+x wt%Ag)، کاهش اندازه دانه  و ساختارهای متراکم را دراثر افزایش نانوذرات نقره ﻇﺎهر ﻧﻤﻮدﻧد.  ﻗﺴﻤﺖهای حقیقی ﭘﺬﯾﺮﻓﺘﺎری مغناطیسی، رﻓﺘﺎر دﯾﺎمغناطیسی ذاﺗﯽ  و اﺗﺼﺎﻻت  ﻣﺮزدانه‌ای را ﻧﻤﺎﯾﺎن  ﺳﺎﺧﺘﻪ و ﻣﻮﻟﻔﻪهای ﻣﻮﻫﻮمی ﭘﺬﯾﺮﻓﺘﺎری مغناطیسی، اﺗﻼف  اﻧﺮژی ﻧﺎﺷﯽ از ﻧﻔﻮذ ﺷﺎر و ﺣﺮﮐﺖ ﮔﺮدﺷﺎرها در ﻣﺮز دانه‌ها را نشان دادﻧﺪ. از ﺑﺮرﺳﯽ نمودار حقیقی ﭘﺬﯾﺮﻓﺘﺎری مغناطیسی نمونه خالص Y123  دمای ﺑﺤﺮاﻧﯽ 92 کلوین به دست  آﻣﺪ و دﯾﺎﻣﻐﻨﺎﻃﯿﺲ ﮐﺎﻣﻞ در ﺗﻤﺎمی نمونه‌ها (۰۰/۰، ۰۶/۰، ۱۰/۰ و ۳۰/۰x=) مشاهده گردید. همچنین ﻫﻤﻪ نمونه‌ها با وجود نانوذرات نقره به ﻃﻮر ﮐﺎﻣﻞ ابررسانا ﺑﺎﻗﯽ ﻣﺎﻧﺪه و اﻓﺰودن نانوذرات نقره دمای ﺑﺤﺮاﻧﯽ را کاهش و ﭼﮕﺎﻟﯽ جریان ﺑﺤﺮاﻧﯽ را افزایش داد. نتیجه این که بر ﻣﺒﻨﺎی ﻣقادیر به دست آﻣﺪه ﻣﺎکزﯾﻤﻢ جریان ژوزﻓﺴﻮن و اﻧﺮژی ﺟﻔﺖ شدﮔﯽ بین‌دانه‌ای ژوزﻓﺴﻮن، 10/0x= بهترین درصد وزنی برای Ag در ﻣﯿﺎن نمونه‌های آﻻﯾﯿﺪه شده Y123 است. در حقیقت اﻧﺮژی ﺟﻔﺖ شدﮔﯽ بین‌دانه‌ای ژوزﻓﺴﻮن  باعث افزایش نیروی مهارکننده شده که این خود افزایش ﭼﮕﺎﻟﯽ جریان ﺑﺤﺮاﻧﯽ را به دﻧﺒﺎل ﺧﻮاﻫﺪ داﺷﺖ.
 

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Silver Nanoparticles on AC Magnetic Susceptibility of High Temperature Y123 Superconductor

نویسندگان [English]

  • Gholamabbas Shams 1
  • Mehrdad Ebrahimnezhad 2
1 Department of Physics, Shiraz Branch, Islamic Azad University, Shiraz, Iran
2 Department of Physics, (college of science) Shiraz Branch, Islamic Azad University, Shiraz, Iran
چکیده [English]

In this study, the effect of of silver nanoparticles (Ag-NPs) inclusion on the AC magnetic susceptibility of high temperature YBa2Cu3O7-δ  (Y123) + x wt% Ag (x=0.00, 0.06, 0.10 and 0.30)  polycrystalline superconductors was investigated. The high temperature superconductors (Y123 + x wt% Ag) were fabricated by  the solid state reaction method. XRD analysis of the samples showed superconducting orthorhombic phase with symmetry of Pmmm space group. Analysis of scanning electron microscopy (SEM) images related to the surface morphology of the samples showed that increasing silver nanoparticles dopant causes a decrease in granule size of the compounds. Real magnetic susceptibility exhibited intrinsic diamagnetic behavior and grain boundary connections and imaginary components of magnetic susceptibility showed energy loss due to flux penetration and vortex movement at the grain boundary. The critical temperature of 92 K was obtained for pure Y123 by real component of magnetic susceptibility and complete diamagnetism was observed in all samples (x=0.00, 0.06, 0.10 and 0.30). Silver decreased the critical temperature and increased the critical current density. Based on the obtained values of maximum Josephson current and Josephson intergranular energy coupling, it can be concluded that x=0.10 is the best weight percentage for Ag among the Y123 doped samples. Indeed, the greater inter-granular Josephson coupling energy causes, the superior of the trapping force and consequently produces the better critical current density.

کلیدواژه‌ها [English]

  • YBCO
  • High Temperature Superconductors
  • Magnetic Susceptibility
  • Silver Nanoparticles

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فصلنامه علمی - پژوهشی مواد نوین
دوره 12، شماره 45
آذر 1400
صفحه 95-110

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  • تاریخ دریافت: 01 دی 1400
  • تاریخ پذیرش: 06 اسفند 1400

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