اثر افزودنی پلی‌وینیل پیرولیدن (PVP) بر خواص فازی و مغناطیسی نانو ذرات فریت کبالت تهیه شده به‌روش هیدروترمال


دانشکده مواد و متالورژی، دانشگاه علم و صنعت ایران


در این پژوهش اثر مقدار افزودنی پلی وینیل پیرولیدن (PVP) بر ساختار، ریخت شناسی1 و ویژگی‌های مغناطیسی فریت کبالت تهیه شده به‌روش هیدروترمال بررسی شد. بررسی فازی نمونه‌ها با پراش سنجی پرتو ایکس (XRD) در شرایط گوناگون فرایند تولید، نشان‌دهنده‌ی تشکیل فریت کبالت است. در دمای °C ۱۹۰ با کاهش مقدار PVP به ۱/0 درصد حجمی افزون بر فریت کبالت، قله‌های اکسید کبالت نیز دیده شد. تهیه‌ی طیف-های فروسرخ افزودنی PVP، نمونه‌ی آماده سازی شده پیش از فرایند هیدروترمال و C-0.1PVP3, 190 با طیف سنجی FTIR و مقایسه‌ی آن‌ها بیانگر تشکیل پیوند بین زنجیره‌های افزودنی PVP و سطح ذرات هیدروکسید فلزی و فریت کبالت بود که این کار مانع از رشد و درشت شدن آن-ها به‌هنگام فرایند تولید می‌شود. برای دیدن ریخت شناسی نمونه‌ها از میکروسکوپ الکترونی روبشی (SEM) استفاده شد. بر پایه‌ی یافته‌های به‌دست آمده از اندازه‌گیری ویژگی‌های مغناطیسی نانو ذرات با مغناطومتر نمونه‌ی ارتعاشی (VSM)، با افزایش مقدار افزودنی PVP از 1 /0 به 3/0 درصد حجمی، میدان پسماندزدای مغناطیسی از 298 به 684 اورستد افزایش و مغناطش اشباع از emu/g 58 به emu/g 51 کاهش یافت.


عنوان مقاله [English]

Effect of PVP Additive on Properties of Cobalt Ferrite Nanoparticles Prepared by Hydrothermal Method

نویسندگان [English]

  • P. Razmjouee
  • S. M. Mirkazemi
چکیده [English]

In this investigation, the effect of Polyvinylpyrrolidone (PVP) additive on microstructure, morphology and magnetic properties of cobalt ferrite nanoparticles prepared by hydrothermal method was studied. X-ray diffraction (XRD) studies in different synthesis conditions showed the formation of cobalt ferrite and cobalt oxide. Comparing IR spectrum of PVP additive, sol prepared before hydrothermal process and C-0.1PVP3, 190 obtained by FTIR spectroscopy indicated the formation of bond between PVP and surface of metallic hydroxide and cobalt ferrite particles, which prevented them from growing and coarsening. Scanning electron microscope (SEM) was used to study the morphology of samples. According to vibration sample magnetometer (VSM) results, as PVP amount increases from 0.1 to 0.3 volume percent, coercive field increases from 298 to 684 Oe and saturation magnetization decreases from 58 to 51 emu/g.

کلیدواژه‌ها [English]

  • Cobalt Ferrite
  • nano particles
  • magnetic properties
  • hydrothermal
  • PVP additive
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