بررسی تأثیر نانوذرات دی‌اکسید تیتانیوم بر ویژگی‌های مغناطیسی و ساختاری ابررسانای سرامیکی پایه بیسموت Bi2Sr2Ca2Cu3O10+θ

نویسندگان

1 گروه پژوهشی مواد غیرفلزی، پژوهشگاه نیرو، تهران، ایران

2 گروه مهندسی و علم مواد، دانشکده فنی و مهندسی، دانشگاه بین‌المللی امام خمینی (ره)، قزوین، ایران

چکیده

در این مقاله تأثیر نانوذرات دی‌اکسید تیتانیوم بر ساختار و خواص مغناطیسی ابررسانای Bi1.6Pb0.4Sr2Ca2Cu3O10+θ (Bi-2223) از سیستم سرامیکی پایه بیسموت بیسکو (BSCCO) بررسی شده است. برای این منظور ترکیب ابررسانای Bi-2223 به‌روش سل- ژل تهیه شده و در ادامه، فرایند اصلاح سطح نانوذرات دی‌اکسید تیتانیم، توسط واکنش شیمیایی با تولوئن دی ایزوسیانات (TDI) صورت گرفت. با هدف مشخصه‌یابی ترکیبات سنتز شده و بررسی اثر نانوذرات دی‌اکسید تیتانیوم بر خواص ساختاری و ابررسانایی نمونه‌ها، اندازه‌گیری‌های پراش پرتوی ایکس، تصویربرداری میکروسکوپی گسیل میدانی، پذیررفتاری مغناطیسی و منحنی هیسترزیس انجام گرفت. بر اساس تحلیل الگوی پراش پرتوی ایکس نمونه‌ها با استفاده از نرم‌افزار MAUD، افزودن مقادیر کم نانوذرات دی‌‌اکسید تیتانیم بر شکل‌گیری فاز مطلوب Bi-2223 تأثیر محسوسی نداشته و افزودن مقادیر بالاتر نانوذرات (0/8 درصد وزنی) درصد شکل‌‌گیری این فاز را کاهش می‌دهد. بر اساس اندازه‌گیری‌های مغناطیسی، دمای گذار ابررسانایی با افزایش درصد نانوذرات کاهش می‌یابد و افزودن نانوذرات بر پهنای حلقه هیسترزیس تأثیر گذاشته و ترکیب با 0/2 درصد وزنی، بیشترین مقدار مغناطش‌‌پذیری، پهنای حلقه هیسترزیس و چگالی جریان بحرانی را داراست.

کلیدواژه‌ها


عنوان مقاله [English]

EVALUATION OF THE ENFUANCE OF TITANIUM DIOXIDE NANOPARTICLES ON THE STRUCTURAL AND MAGNETIC PROPERTIES OF BI2SR2CA2CU3O10+Θ

نویسندگان [English]

  • H. Fallah-Arani 1
  • S. Baghshahi 2
  • A. Sedghi 2
  • F. Shahbaz Tehrani 1
1 Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, Iran
2 Department of Materials Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran
چکیده [English]

In this research, the influence of titanium dioxide nanoparticles on the structural and magnetic properties of high-temperature superconductor Bi1.6Pb0.4Sr2Ca2Cu3O10+θ (Bi-2223) from the Bi-based ceramic system  (BSCCO) was studied. In order to investigate the synthesized samples, X-ray diffractometry and magnetic measurements were performed. Based on the magnetic measurements, the superconductivity transition temperature declined with the increase in the nanoparticles' content. The addition of nanoparticles affected on the hysteresis loop width. Accordingly, the compound containing 0.2 wt.% nanoparticles had the maximum magnetization,  hysteresis loop width, and critical current density.

کلیدواژه‌ها [English]

  • Bi-2223 superconductor
  • titanium dioxide
  • hysteresis loop
  • magnetic susceptibility
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