تأثیر نسبت مولی آهن/ باریم بر ترکیب فازی، دمای سنتز، ریزساختار و خواص مغناطیسی هگزافریت باریم

نویسندگان

1 1- گروه مهندسی مواد، دانشکده فنی مهندسی، دانشگاه جامع امام حسین (ع) تهران

2 2- دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، باشگاه پژوهشگران جوان و نخبگان، تهران

چکیده

در این پژوهش، تأثیر نسبت مولی آهن/باریم بر ترکیب فازی، دمای سنتز، ریزساختار و خواص مغناطیسی هگزافریت باریم تهیه شده به‌روش فعال‌سازی مکانیکی بررسی شد. به‌منظور سنتز این ترکیب از نسبت‌های مولی آهن/باریم 12 و 6 استفاده شد. تأثیر نسبت مولی آهن/باریم، زمان آسیاکاری و دمای عملیات حرارتی در تعیین شرایط بهینه برای تولید این ترکیب مورد بررسی قرار گرفت. به‌منظور بررسی‌های فازی، مورفولوژی و خواص مغناطیسی محصول نهایی به‌ترتیب از آزمون پراش اشعه ایکس (XRD)، میکروسکوپ الکترونی روبشی (SEM) و مغناطیس‌سنجی نمونه مرتعش (VSM) استفاده شد. طبق نتایج نسبت مولی آهن/باریم برابر با 6، زمان 10 ساعت آسیا‌کاری و دمای 800 درجه ‌سانتی‌گراد به‌عنوان شرایط بهینه برای تولید این ترکیب به‌صورت تک فاز به‌دست آمد. تصاویر میکروسکوپی الکترونی روبشی نشان‌دهنده ذراتی با مورفولوژی هگزاگونال و تقریباً کروی به‌ترتیب برای نمونه‌های تهیه شده با نسبت‌های مولی آهن/باریم 12 و 6 بود. همچنین طبق بررسی‌های مغناطیسی بیشترین مقدار مغناطش اشباع (emu/g 48/56) و نیروی وادارندگی (Oe 2/5247) برای نمونه سنتز شده با نسبت مولی آهن/باریم 6 حاصل شد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Influence of Fe/Ba Molar Ratio on Phase Composition, Synthesis Temperature, Microstructure and Magnetic Properties of Barium Hexaferrite

نویسندگان [English]

  • S. S. Seyyed Afghahi 1
  • M. Jafarian 2
1 1- Department of Materials Engineering, Faculty of Engineering, Imam Hossein University, Tehran, Iran
2 2- Islamic Azad University, Science and Research Branch, Young Researchers and Elit Club, Tehran, Iran
چکیده [English]

In this study, the effect of Fe/Ba molar ratio was investigated on the phase composition, synthesis temperature, microstructure and magnetic properties of barium hexaferrite prepared via mechanical activation. In order to synthesize this compound, Fe/Ba molar ratios of 12 and 6 were used. The effect of Fe/Ba molar ratio, milling time and heat treatment temperature for achieving the optimal conditions in producing this compound was studied. In order to study the phase, morphology and magnetic properties of the final product, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Vibrating Sample Magnetometer (VSM) were used respectively. According to the results, Fe/Ba molar ratio of 6, 10 h milling time and temperature of 800 °C were found to be the optimal conditions for producing this compound in a single phase. Scanning electron microscopy images show the hexagonal morphology and almost spherical particles respectively for samples prepared with Fe/Ba molar ratio equal to 12 and 6. Moreover, according to the magnetic studies, the maximum amount of saturation magnetization (56.48 emu/g) and the coercivity force (5247.2 Oe) were obtained for the sample synthesized with Fe/Ba molar ratio of 6.
 

کلیدواژه‌ها [English]

  • Barium hexaferrite
  • Mechanical activation
  • Fe/Ba molar ratio
  • magnetic properties
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