نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه فیزیک، دانشکده علوم، دانشگاه سیستان و بلوچستان، زاهدان، ایران

2 دانشگاه سیستان و بلوچستان - دانشکده علوم - گروه فیزیک - عضو هیات علمی

3 گروه مهندسی مواد، دانشکده مهندسی شهید نیکبخت، دانشگاه سیستان و بلوچستان، زاهدان، ایران

چکیده

در پژوهش حاضر از روش احتراقی محلول توسط نمک کلرید پتاسیم برای سنتز نانوذرات فریت کبالت استفاده شد. از نمک کلرید پتاسیم به عامل افزایش دهندۀ سطح ویژه و از اسید نیتریک به‌عنوان اکسندۀ کمکی و عامل تنظیم pH استفاده شد. اثر هم‌زمانpH  اولیۀ محلول واکنش و اندازۀ افزودن نمک کلرید پتاسیم بر سطح ویژه، خواص ساختاری، ریزساختاری و مغناطیسی پودرهای سنتزی مطالعه شد. بدین منظور از تحلیل‌های پراش پرتو ایکس، میکروسکوپ الکترونی روبشی، تبدیل فوریۀ فروسرخ، مغناطیس‌سنج نمونۀ ارتعاشی در دمای اتاق، و روش برونئر – امت – تل‌لر استفاده شد. نتایج نشان دادpH  اولیه و اندازۀ نمک کلرید پتاسیم اثر متقابل بر سطح ویژه پودرهای فریت کبالت داشت. در شرایط بهینه پودرهای فریت کبالت با سطح ویژۀ  بالا g-1 m2 77/87 با موفقیت سنتز شد. پودرهای سنتزی ریزساختار مزو متخلخل و رفتار مغناطیسی سخت داشتند‏.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Enhancement of specific surface area of CoFe2O4 powders synthesized by KCl-assisted solution combustion: effect of KCl content and initial pH

نویسندگان [English]

  • Saedeh Omidi 1
  • Abdol Mahmood DAVARPANAH 2
  • Ahmad Reza Abbasian 3

1 Department of Physics, Faculty of Sience, University of Sistan and Baluchestan, Zahedan, Iran

2 Department of Physics Faculty of Science University of Sistan and Baluchestan

3 Department of Materials Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran

چکیده [English]

In the present study, the potassium chloride-assisted solution combustion method was used to synthesize cobalt ferrite nanoparticles. Potassium chloride salt was used as a specific surface enhancer and nitric acid was used as an auxiliary oxidizer and pH regulator. The simultaneous effect of the initial pH of the solution and the amount of added potassium chloride salt on the specific surface area, structural, microstructural and magnetic properties of synthetic powders were studied. X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FT-IR), Vibrating Sample Magnetometer (VSM) at room temperature and Brunnauer–Emmet–Teller (BET) method were used for those purposes. The results showed that the initial pH and the amount of potassium chloride salt had an interaction effect on the specific surface area of cobalt ferrite powders. Under optimal conditions, cobalt ferrite powders with high specific surface area of 87.77 m2g-1 were successfully synthesized. Synthetic powders had mesoporous microstructure and hard magnetic behavior.

کلیدواژه‌ها [English]

  • cobalt ferrite
  • nanoparticles
  • magnetization
  • salt addition
  • solution combustion
  • specific surface area
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