ویژگی‌های ریزساختاری، نوری و مغناطیسی نانوذرات Mn0/3-xBaxCu0/2Zn0/5Fe2O4

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه دامغان

چکیده

اثر جانشانی یون Ba بر ویژگی­های ساختاری، نوری و مغناطیسی فریت­های Mn0/3-xBaxCu0/2Zn0/5Fe2O4 بررسی شد.
نمونه­ها با پراش­سنج پرتو ایکس، طیف­سنج تبدیل فوریه فروسرخ، میکروسکوپ الکترونی روبشی، طیف­سنج نوری مرئی-فرابنفش و مغناطیس­سنج نمونه ارتعاشی مشخصه­یابی شدند. نتایج ساختاری نشان داد که ساختار نمونه­ها تا جانشانی x = 0/20 کاملاً در یک ساختار مکعبی تک فاز (گروه فضایی Fd3m) بلوری شده­اند، در حالی که فاز ناخالصی BaO در نمونه­های با x = 0/25, 0/30 دیده شد. افت مشاهده شده در مغناطش نمونه­ها ناشی از حضور یون­های غیرمغناطیسی Ba2+ در جایگاه هشت­وجهی است. گاف انرژی نمونه­ها با افزایش جانشانی باریم تا x = 0/10 یک روند افزایشی را نشان می­دهد و در ادامه با جانشانی، کاهش می­یابد. مقادیر گاف نواری بدست آمده با مقادیر پیشتر گزارش شده برای فریت­ها هم­خوانی دارد. هم­چنین افزایش گاف انرژی نمونه­ها با افزایش باریم را می­توان بر پایه تغییرات ساختار الکترونی توضیح داد.    

کلیدواژه‌ها

عنوان مقاله [English]

Microstructural, optical, and magnetic properties of Mn0.3-xBaxCu0.2Zn0.5Fe2O4 nanoparticles

نویسندگان [English]

  • Gholizadeh
  • Beyranvand
  • Zahedi
چکیده [English]

The effect of Ba ion substitution on structural, optical, and magnetic properties of Mn0.3-xBaxCu0.2Zn0.5Fe2O4 ferrites was investigated. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, UV-Vis spectroscopy, and vibrating sample magnetometer at room temperature. Structural results show that the structure of the samples with x up to 0.20 is completely indexed to a single-phase cubic structure (space group Fd m), while the impurity phase of BaO is observed in the samples with x = 0.25, 0.30. As the substitution content increases, the presence of non-magnetic Ba2+ ions in the octahedral site decreases the saturation magnetization of the samples. Comparison of the bandgap energy of the samples shows an increasing trend with Ba substitution for x up to 0.10 and then decreases, which can be interpreted in terms of changes in the electronic structure of the samples.
 

کلیدواژه‌ها [English]

  • Mn-Cu-Zn spinel ferrite
  • Citrate-nitrate method
  • X-ray diffraction
  • magnetic properties
  • Optical properties

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  • تاریخ دریافت: 19 مهر 1400
  • تاریخ بازنگری: 29 آبان 1400
  • تاریخ پذیرش: 30 آذر 1400

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