تأثیر دمای پخت بر خواص ساختاری، مغناطیسی و اپتیکی نانوساختار هگزافریت SrCo2Fe16O27

نویسندگان

گروه فیزیک، دانشکده علوم، دانشگاه شهید چمران اهواز، اهواز

چکیده

در این پژوهش، نانوساختارهای هگزافریت نوع W با فرمول SrCo2Fe16O27 به­روش سل- ژل خود احتراقی تهیه شدند. تأثیر دمای پخت بر خواص ساختاری، مغناطیسی و اپتیکی این نانوساختارها، بررسی شد. ریخت­ شناسی و ساختار بلوری نمونه ­ها با استفاده از میکروسکوپ الکترونی روبشی گسیل میدانی و پراش پرتوی ایکس مشخصه­ یابی شد. براساس نتایج حاصل از الگوهای پراش پرتو ایکس، مشاهده شد که در دمای پخت 1000 درجه سانتی‌گراد بیشترین میزان فاز اصلی تشکیل شده است. بررسی­ تصاویر میکروسکوپی الکترونی روبشی نشان داد که ریخت‌شناسی نمونه ­های ساخته شده، صفحه ­­ای است. برای تأیید تشکیل فاز اصلی از آزمون مادون قرمز تبدیل فوریه استفاده شد. نتایج آنالیز مادون قرمز تبدیل فوریه تشکیل جایگاه ­های چهار­وجهی و هشت­ وجهی به­ عنوان ویژگی­ مهم هگزافریت­ ها را تأیید کرد. خواص مغناطیسی نمونه ­ها توسط مغناطیس ­سنج نمونه ارتعاشی اندازه ­گیری شد و نشان داد که با افزایش دما، مغناطیس اشباع (Ms) افزایش می­ یابد. همچنین خواص اپتیکی نمونه­ ها توسط آزمایش طیف­ سنجی جذب مرئی- فرابنفش و طیف­ سنجی فوتولومینسانس مورد بررسی قرار گرفتند. طبق نتایج حاصل از هر دو طیف، اندازه شکاف انرژی تقریباً یکسان بوده و با افزایش دما تقریباً ثابت است.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Annealing Temperature on the Structural, Magnetic and Optical Properties of SrCo2Fe16O27 Hexaferrite Nanostructure

نویسندگان [English]

  • N. Alirezaei Varnosfaderani
  • S. E. Mousavi Ghahfarokhi
  • M. Zargar Shoushtari
Department of Physics, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
چکیده [English]

In this paper, W-type SrCo2Fe16O27 hexaferrite nanostructures were synthesized by sol-gel auto-combustion method. Effect of annealing temperature on the structural, magnetic and optical properties of these SrCo2Fe16O27 nanostructures was investigated. In order to determine the annealing temperature of samples, the prepared gel was examined by thermo-gravimetric and differential-thermal analyses. Morphology and crystal structure of the prepared samples were characterized by field emission scanning electron microscopy and X-ray diffraction pattern. Based on X-ray diffraction results, at annealing temperature of 1000 °C, the maximum amount of main phase formed. A planar morphology was spectroscopy for the synthesized samples through scanning electron microscope images. Fourier transform infrared analysis was used to confirm the synthesis of the main properties obtained of samples were measured by the vibrating sample magnetometer and the results showed that by increasing temperature, magnetic saturation increases. Moreover, optical properties of samples were investigated by ultraviolet–visible absorption and photoluminescence spectroscopies. The result of measurements of the energy gap approximately is same in the ultraviolet- visible and photoluminescence spectroscopes and also the energy gap is constant with increasing temperature.

کلیدواژه‌ها [English]

  • W-type Hexaferrite
  • Sol-Gel Auto-Combustion
  • Annealing Temperature
  • structural properties
  • magnetic properties
  • Optical properties
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