بررسی تشکیل فازها، خواص مغناطیسی و ریزساختار نانوذرات نیکل فریت سنتز شده با سل- ژل خود احتراقی

نویسندگان

دانشکده مهندسی مواد ومتالورژی، دانشگاه علم و صنعت ایران

چکیده

در این پژوهش نانوذرات نیکل فریت به روش سل –ژل خوداحتراقی سنتز شدند و تأثیر دمای کلسیناسیون بر تشکیل فازها، خواص مغناطیسی و ریزساختار نانوذرات نیکل فریت سنتز شده با استفاده از پراش پرتو ایکس، مغناطومتر نمونه ارتعاشی و میکروسکوپ الکترونی روبشی بررسی شد. همچنین برروی نتایج پراش پرتو ایکس آنالیز کمی صورت گرفت. بررسی‌های ریزساختاری و محاسبه اندازه بلورک‌ها تشکیل نانوذرات را نشان داد. الگوهای پراش پرتو ایکس نشان داد که محصول احتراق شامل نیکل فریت، هماتیت، NiO، FeNi3 است. با انجام کلسیناسیون، FeNi3 حذف شد و مقدار NiO و هماتیت با تغییر دمای کلسیناسیون تغییر کرد. مغناطش اشباع با کلسیناسیون در دمای 600 درجه سانتی‌گراد از emu/g37 به emu/g30 کاهش یافت که به‌دلیل تجزیه فاز مغناطیسی FeNi3 و افزایش مقدار فاز آنتی‌فرومغناطیسی هماتیت است. میدان پسماندزدا نیز افزایش پیدا کرد که می‌تواند به‌دلیل افزایش نسبی مقدار فاز نیکل فریت و حذف فاز FeNi3 باشد. مقدار مغناطش اشباع در نمونه کلسینه شده در دمای 1000 درجه سانتی‌گراد به‌دلیل واکنش بین هماتیت و اکسید نیکل و افزایش درصد نیکل فریت به مقدار emu/g43 افزایش یافت و نیروی پسماندزدای مغناطیسی تا Oe127 کاهش یافت که می‌تواند به‌دلیل افزایش اندازه ذرات و ایجاد ذرات مغناطیسی چند سامان باشد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Evaluating Phase Constituents, Magnetic Properties and Microstructure of Nickel Ferrite Nanoparticles Synthesized by Sol-Gel Auto-Combustion

نویسندگان [English]

  • S. Alamolhoda
  • S. M. Mirkazemi
  • T. Shahjooyi
  • N. Benvidi
Department of Metallurgy and Materials Engineering, Iran University of Science & Technology (IUST), Tehran, Iran
چکیده [English]

In this research, nickel ferrite nanoparticles were synthesized by sol-gel auto-combustion route, and the effect of calcination temperature on phase constituents, magnetic properties and microstructure of the synthesized nanoparticles was evaluated using X-ray Diffraction (XRD), Vibrating Sample Magnetometer (VSM) and Scanning Electron Microscopy (SEM). XRD results were submitted to quantitative analysis. Microstructural studies and crystallite size calculations showed formation of nanoparticles. XRD results showed that the combustion product consisted of NiFe2O4, α-Fe2O3, NiO, and FeNi3 phases. FeNi3 was eliminated by calcination, and the amounts of NiO and α-Fe2O3 were modvlated by changing in calcination temperature. Saturation magnetization changed from 37emu/g in combustion product to 30emu/g by calcination at 600°C, due to decomposition of FeNi3 magnetic phase and formation of higher amount of antiferromagnetic hematite phase. Also, the coercivity values increased, that could be due to increasing the amount of nickel ferrite phase and eliminating FeNi3 phase. Saturation magnetization reached to 43emu/g in calcinated sample at 1000°C due to the reaction between hematite and NiO phases that led to formation of higher amount of nickel ferrite to 43emu/g. Coercivity value dropped out to 127Oe by calcination at 1000°C, the reason of which could be incresing of particle size and formation of multi domain magnetic particles.
 

کلیدواژه‌ها [English]

  • magnetic properties
  • Sol-Gel Auto-Combustion
  • Nickel ferrite
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