بررسی تأثیر افزودن دیسپرسیم بر خواص ساختاری و مغناطیسی نانوذرات فریت Mn-Zn

نویسندگان

دانشگاه یزد، دانشکده مهندسی معدن و متالورژی، بخش مهندسی مواد و متالورژی، یزد، ایران

چکیده

در این پژوهش، نانوذرات (0/1، 0/075، 0/05، 0/025، 0 =x) Mn0.8Zn0.2Fe2-xDyxO4 برای اولین بار توسط روش سل– ژل احتراقی تهیه شد. تأثیر افزودن دیسپرسیم بر خواص ساختاری، مغناطیسی و همچنین ریزساختار نمونه‌های تولید شده با استفاده از روش پراش پرتوی ایکس (XRD)، طیف‌سنجی مادون قرمز تبدیل فوریه (FTIR)، مغناطش‌سنج نمونه ارتعاشی (VSM) و میکروسکوپ الکترونی روبشی گسیل میدانی (FE-SEM) بررسی شد. نتایج بررسی‌ها نشان داد که در تمام نمونه‌های تولید شده ساختار اسپینل مکعبی تشکیل شده است. همچنین مشخص شد افزودن دیسپرسیم سبب افزایش پارامتر شبکه و کاهش اندازه بلورک‌‌ها شده است. تصاویر میکروسکوپی الکترونی روبشی گسیل میدانی نیز نشان دادند که حضور دیسپرسیم نه تنها نقش مؤثری در کاهش آگلومراسیون نانوذرات و توزیع یکنواخت آنها دارد بلکه سبب کاهش میانگین اندازه آنها نیز می‌شود، به‌گونه‌ای که میانگین اندازه ذرات از 130 به 33 نانومتر کاهش یافت. بررسی خواص مغناطیسی نمونه‌ها نیز نشان داد که با حضور دیسپرسیم مغناطش اشباع و نیروی پسماندزدای مغناطیسی هر دو کاهش می‌یابند، به‌نحوی که مغناطش نمونه‌ها از 66/3 به emu/g58/4 و نیروی پسماندزدا مغناطیسی نیز از 78/5 به Oe71/9 کاهش یافت.

کلیدواژه‌ها

عنوان مقاله [English]

THE EFFECT OF DY- DOPING ON THE STRUCTURAL AND MAGNETIC PROPERTIES OF MN-ZN FERRITE NANOPARTICLES

نویسندگان [English]

  • M. Shayestefar
  • A. R. Mashreghi
  • S. Hasani
Department of Mining and Metallurgical Engineering, Yazd University
چکیده [English]

Mn0.8Zn0.2Fe2-xDyxO4 (where x= 0, 0.025, 0.05, 0.075, 0.1) ferrite nanoparticles were synthesized by auto- combustion sol-gel method for the first time in this study. The effect of Dy-doping on the structural and magnetic properties of the produced specimens was examined using the X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometery (VSM), and field emission scanning electron microscope (FE-SEM). The results showed that a cubic spinel structure was formed in all of the synthesized specimens. It was also found that the addition of Dy increased the lattice parameter while decreased the average of crystallites size. Furthermore, the FE-SEM micrographs showed that Dy not only plays an effective role in reducing the agglomeration of nanoparticles and their distribution, but also reduces the average of particle size. It was also observed that the addition of Dy had no effect on the morphology of the synthesized nanoparticles. Investigation of the magnetic properties revealed a clear decrease in the saturation magnetization and coercivity by the Dy addition. So that the saturation magnetization of the samples decreased from 66.3 to 58.4 emu/g and the coercivity decreased from 78.5 to 71.9 Oe.

کلیدواژه‌ها [English]

  • Mn-Zn Ferrite
  • Sol – Gel
  • nanoparticles
  • magnetic properties
  • structural properties

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مواد پیشرفته در مهندسی
دوره 40، شماره 1
خرداد 1400
صفحه 65-81

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