Cover Image

Synthesis and characterization of cobalt based ferrite

Magnetoelectric (ME) materials have the ability to convert magnetic energy into electrical energy and/or vice versa. This work involves the study of structural, electrical and magnetic properties of (f)Ni(1-x)(Co/Mn)xFe2O4/Pb(Mg0.33Nb0.67)0.67 Ti0.33O3 nanocomposites, which have been successfully sy...

Full description

Saved in:
Bibliographic Details
Main Author: A. Ati, Ali
Format: Thesis
Language:English
Published: 2015
Subjects:
QC Physics
Online Access:http://eprints.utm.my/id/eprint/61080/1/AliAATIPFS2015.pdf
http://eprints.utm.my/id/eprint/61080/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:96531
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.utm.61080
record_format eprints
spelling my.utm.610802017-03-13T07:55:15Z http://eprints.utm.my/id/eprint/61080/ Synthesis and characterization of cobalt based ferrite A. Ati, Ali QC Physics Magnetoelectric (ME) materials have the ability to convert magnetic energy into electrical energy and/or vice versa. This work involves the study of structural, electrical and magnetic properties of (f)Ni(1-x)(Co/Mn)xFe2O4/Pb(Mg0.33Nb0.67)0.67 Ti0.33O3 nanocomposites, which have been successfully synthesized by chemical co-precipitation method. The presence of both phases in the composites were confirmed by using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and vibration sample magnetometer (VSM). The variations of dielectric constant and loss tangent as a function of frequency as well as temperature were studied using two-point probe impedance analyzer. Temperature dependent dielectric constant shows diffused phase transition in magnetoelectric nanocomposites. The DC electrical resistivity measurements were carried out within the temperature range of 300 – 923 K. Variation of magnetoelectric voltage coefficient traces the path of magnetostriction as a function of magnetic field. All composites show peak behavior in magnetic field dependent on magnetoelectric voltage coefficient. The magnetoelectric (ME) powder nanocomposite system of (f) Ni(1-x)(Co/Mn)xFe2O4+ (1-f) Pb(Mg0.33Nb0.67)0.67Ti0.33O3 (with x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) and f = 0.15, has been successfully studied. The magnetoelectric coefficient for all the composites were measured using static magnetoelectric set up. All magnetic field dependent of magnetoelectric measurements show peak behaviour, which can be explained on the basis of magnetic field dependent variation of magnetostriction and piezomagnetic coefficient behavior. The strong compositional dependent of magnetoelectric voltage coefficient is a common feature for ferrite base nanocomposites. In this study the magnitude of the magnetoelectric coefficient is found to be higher with increasing amount of ferrite phase in nanocomposites samples. The magnetoelectric studies show that high resistive magnetic phase with high piezomagnetic coefficient in low magnetic field region is helpful to enhance the magnetoelectric coupling. The present data suggest that the magnetoelectric interaction depends on the magnetostriction behaviour, piezomagnetic coefficient, resistivity, content of constituent phases and connectivity between the phases. 2015-02 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/61080/1/AliAATIPFS2015.pdf A. Ati, Ali (2015) Synthesis and characterization of cobalt based ferrite. PhD thesis, Universiti Teknologi Malaysia, Faculty of Science. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:96531
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic QC Physics
spellingShingle QC Physics
A. Ati, Ali
Synthesis and characterization of cobalt based ferrite
description Magnetoelectric (ME) materials have the ability to convert magnetic energy into electrical energy and/or vice versa. This work involves the study of structural, electrical and magnetic properties of (f)Ni(1-x)(Co/Mn)xFe2O4/Pb(Mg0.33Nb0.67)0.67 Ti0.33O3 nanocomposites, which have been successfully synthesized by chemical co-precipitation method. The presence of both phases in the composites were confirmed by using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and vibration sample magnetometer (VSM). The variations of dielectric constant and loss tangent as a function of frequency as well as temperature were studied using two-point probe impedance analyzer. Temperature dependent dielectric constant shows diffused phase transition in magnetoelectric nanocomposites. The DC electrical resistivity measurements were carried out within the temperature range of 300 – 923 K. Variation of magnetoelectric voltage coefficient traces the path of magnetostriction as a function of magnetic field. All composites show peak behavior in magnetic field dependent on magnetoelectric voltage coefficient. The magnetoelectric (ME) powder nanocomposite system of (f) Ni(1-x)(Co/Mn)xFe2O4+ (1-f) Pb(Mg0.33Nb0.67)0.67Ti0.33O3 (with x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) and f = 0.15, has been successfully studied. The magnetoelectric coefficient for all the composites were measured using static magnetoelectric set up. All magnetic field dependent of magnetoelectric measurements show peak behaviour, which can be explained on the basis of magnetic field dependent variation of magnetostriction and piezomagnetic coefficient behavior. The strong compositional dependent of magnetoelectric voltage coefficient is a common feature for ferrite base nanocomposites. In this study the magnitude of the magnetoelectric coefficient is found to be higher with increasing amount of ferrite phase in nanocomposites samples. The magnetoelectric studies show that high resistive magnetic phase with high piezomagnetic coefficient in low magnetic field region is helpful to enhance the magnetoelectric coupling. The present data suggest that the magnetoelectric interaction depends on the magnetostriction behaviour, piezomagnetic coefficient, resistivity, content of constituent phases and connectivity between the phases.
format Thesis
author A. Ati, Ali
author_facet A. Ati, Ali
author_sort A. Ati, Ali
title Synthesis and characterization of cobalt based ferrite
title_short Synthesis and characterization of cobalt based ferrite
title_full Synthesis and characterization of cobalt based ferrite
title_fullStr Synthesis and characterization of cobalt based ferrite
title_full_unstemmed Synthesis and characterization of cobalt based ferrite
title_sort synthesis and characterization of cobalt based ferrite
publishDate 2015
url http://eprints.utm.my/id/eprint/61080/1/AliAATIPFS2015.pdf
http://eprints.utm.my/id/eprint/61080/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:96531
_version_ 1643655064258084864
score 13.211869

Similar Items