Structural and magnetic properties of aluminium-copper substituted cobalt ferrite nanoparticles sintered at various temperatures

Nanoferrites, especially spinel ferrites have evoked greater attention in the recent years because of their many potential technological applications. Properties of nanoferrites could be tailored and improved by the incorporation of suitable divalent, trivalent or tetravalent ion impurities into the...

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Main Author:	Dabagh, Shadab
Format:	Thesis
Language:	English
Published:	2016
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/78979/1/ShadabDabaghPFS2016.pdf
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spelling	my-utm-ep.789792018-09-19T05:21:30Z Structural and magnetic properties of aluminium-copper substituted cobalt ferrite nanoparticles sintered at various temperatures 2016 Dabagh, Shadab QC Physics Nanoferrites, especially spinel ferrites have evoked greater attention in the recent years because of their many potential technological applications. Properties of nanoferrites could be tailored and improved by the incorporation of suitable divalent, trivalent or tetravalent ion impurities into the spinel lattice. Hence the investigation on the properties of substituted nanoferrites helps to improve the performance of these materials and make their applications more diverse. Study of fundamental properties of materials is crucial, as it may lead to the development of new area of potential application. Nanocrystalline copper-cobalt spinel ferrites and nanocrystalline aluminum substituted copper cobalt spinel ferrites with general formula of Co1-xCuxFe2-xAlxO4, (0.0= x = 0.8) were synthesized using co-precipitation method and sintered from 600 °C to 900 °C. The synthesized nanoferrite samples were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and vibrating sample magnetometer (VSM). XRD analysis confirmed a single phase spinel structure with the crystalline size between 14-26 nm which is calculated using Scherrer’s formula. This size is the most suitable for high density recording media application. The infrared spectra reveal two prominent frequency bands in the wavenumber range of 350-600 cm-1, which confirm the cubic spinel structure and completion of chemical reaction. Substitution of aluminum and copper to cobalt ferrites has made significant changes in the magnetic properties of nanoferrites. Saturation magnetization was observed to decrease by copper and aluminum substitution from 61.6-17.6 emu g-1 at 600 °C to 49.5-25.8 emu g-1 at 900 °C. The increasing trend of magnetic coercivity from 846.9-1117.2 Oe at 600 °C to 219.4-244.0 Oe at 900 °C was consistent with crystallinity of the samples. The simple, economic and environmental friendly sample preparation method using co-precipitation method has contributed towards the controlled growth of high quality ferrite nanopowder and the suitable values of magnetization that can be applied to high-density recording media and microwave devices. 2016 Thesis http://eprints.utm.my/id/eprint/78979/ http://eprints.utm.my/id/eprint/78979/1/ShadabDabaghPFS2016.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:106005 phd doctoral Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Dabagh, Shadab Structural and magnetic properties of aluminium-copper substituted cobalt ferrite nanoparticles sintered at various temperatures
description	Nanoferrites, especially spinel ferrites have evoked greater attention in the recent years because of their many potential technological applications. Properties of nanoferrites could be tailored and improved by the incorporation of suitable divalent, trivalent or tetravalent ion impurities into the spinel lattice. Hence the investigation on the properties of substituted nanoferrites helps to improve the performance of these materials and make their applications more diverse. Study of fundamental properties of materials is crucial, as it may lead to the development of new area of potential application. Nanocrystalline copper-cobalt spinel ferrites and nanocrystalline aluminum substituted copper cobalt spinel ferrites with general formula of Co1-xCuxFe2-xAlxO4, (0.0= x = 0.8) were synthesized using co-precipitation method and sintered from 600 °C to 900 °C. The synthesized nanoferrite samples were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and vibrating sample magnetometer (VSM). XRD analysis confirmed a single phase spinel structure with the crystalline size between 14-26 nm which is calculated using Scherrer’s formula. This size is the most suitable for high density recording media application. The infrared spectra reveal two prominent frequency bands in the wavenumber range of 350-600 cm-1, which confirm the cubic spinel structure and completion of chemical reaction. Substitution of aluminum and copper to cobalt ferrites has made significant changes in the magnetic properties of nanoferrites. Saturation magnetization was observed to decrease by copper and aluminum substitution from 61.6-17.6 emu g-1 at 600 °C to 49.5-25.8 emu g-1 at 900 °C. The increasing trend of magnetic coercivity from 846.9-1117.2 Oe at 600 °C to 219.4-244.0 Oe at 900 °C was consistent with crystallinity of the samples. The simple, economic and environmental friendly sample preparation method using co-precipitation method has contributed towards the controlled growth of high quality ferrite nanopowder and the suitable values of magnetization that can be applied to high-density recording media and microwave devices.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Dabagh, Shadab
author_facet	Dabagh, Shadab
author_sort	Dabagh, Shadab
title	Structural and magnetic properties of aluminium-copper substituted cobalt ferrite nanoparticles sintered at various temperatures
title_short	Structural and magnetic properties of aluminium-copper substituted cobalt ferrite nanoparticles sintered at various temperatures
title_full	Structural and magnetic properties of aluminium-copper substituted cobalt ferrite nanoparticles sintered at various temperatures
title_fullStr	Structural and magnetic properties of aluminium-copper substituted cobalt ferrite nanoparticles sintered at various temperatures
title_full_unstemmed	Structural and magnetic properties of aluminium-copper substituted cobalt ferrite nanoparticles sintered at various temperatures
title_sort	structural and magnetic properties of aluminium-copper substituted cobalt ferrite nanoparticles sintered at various temperatures
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2016
url	http://eprints.utm.my/id/eprint/78979/1/ShadabDabaghPFS2016.pdf
_version_	1747818118331236352

Structural and magnetic properties of aluminium-copper substituted cobalt ferrite nanoparticles sintered at various temperatures

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