تأثیر دمای بازپخت بر خواص ساختاری، مغناطیسی و دی‌الکتریکی نانوذرات PbFe11/8Ni0/2O19

نویسندگان

گروه فیزیک، دانشکده علوم، دانشگاه شهیدچمران اهواز، اهواز

چکیده

در این پژوهش، هگزافریت سرب آلائیده با نیکل ( PbFe12-xNixO19) تحت شرایط 20/0 = x به روش سل- ژل تهیه شد و سپس تأثیر دمای بازپخت بر خواص ساختاری، مغناطیسی و دی‌الکتریکی آن گزارش شده است. رفتار و سازوکار گرمایی ژل پیش ماده توسط آزمون توزین حرارتی و حرارتی تفاضلی ارزیابی گردید. ویژگی‌های ساختاری، مغناطیسی و دی‌الکتریکی نمونه‌ها به‌وسیله طیف سنجی مادون قرمز تبدیل فوریه، پراش پرتو ایکس، میکروسکوپ الکترونی روبشی، مغناطوسنج نمونه ارتعاشی و خود القاء، ظرفیت و مقاومت الکتریکی (LCR) متر بررسی شدند. نتایج الگوی‌ پراش پرتو ایکس نشان می‌دهند که با افزایش دمای بازپخت تا 800 درجه سانتی‌گراد درصد فاز PbFe11/8Ni0/2O19 در نمونه‌ها افزایش می‌یابد. همچنین با افزایش دما، به‌دلیل حذف فاز ثانویه و تشکیل هگزافریت سرب خالص و تک‌فاز، مغناطش افزایش می‌یابد. با افزایش فرکانس رسانندگی الکتریکی جریان الکتریکی متناوب (ac) نمونه‌ها ابتدا کاهش و سپس افزایش می‌یابد که این تغییرات براساس مدل لایه‌ای ماکسول- ویگنر قابل توجیه است. اندازه‌گیری‌ها نشان می‌دهد که بهترین نمونه PbFe11/8Ni0/2O19 با دمای بازپخت 800 درجه سانتی‌گراد و زمان پخت 3 ساعت می‌باشد.
 

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Annealing Temperature on the Structural, Magnetic and Dielectric Properties of PbFe11.8Ni0.2O19 Nanoparticles

نویسندگان [English]

  • S. E. Mousavi Ghahfarokhi
  • F. Bazdar
  • I. kazeminezhad
Department of Physics, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده [English]

In this paper, Ni-doped lead hexaferrites (PbFe12-xNixO19) nanoparticles with x = 0.2 were prepared by sol- gel method. Then, the effect of annealing temperature on its structural, magnetic and dielectric properties was studied. First, the dryed gel was evaluated by Thermogravimetry-Differential Thermal Analysis (TG/DTA) and then, the structural morphology, magnetic and dielectric properties of samples have been characterized by Fourier Transform Infrared (FT-IR) spectroscopy, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Vibrating Sample Magnetometer (VSM) and LCR meter. The results of x-ray diffraction patterns show that by increasing annealing temperature up to 800 °C, PbFe11.8Ni0.2O19 phase percentage in the samples increases. Also, by increasing annealing temperature, the magnetization increases because the unwanted phases disappear and pure and single-phase lead hexaferrite are formed. By increasing frequency, first the AC electrical conductivity of the samples decreases and then increases. These variations have been explained by Maxwell- Wanger model. The result measurements show that the best sample is PbFe11.8Ni0.2O19 with annealing temperature of 800 °C for 3 h.
 

کلیدواژه‌ها [English]

  • Lead Hexaferrites
  • Nickle Dopting
  • Structutal Properties
  • magnetic properties
  • Dielectric Propertie
  • Sol-gel

مراجع

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مواد پیشرفته در مهندسی
دوره 36، شماره 2
شهریور 1396
صفحه 67-80

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