Influence of Nd and Er substitution on magnetic and dielectric properties of bismuth ferrite

BiFeO3 (BFO) is one of the few multiferroic materials with ferroelectric and antiferromagnetic order at room temperature. It can be applied to many modern technologies, such as information storage and sensing devices. In general, BiFeO3 doped with rare earth elements can enhance the ferroelectric an...

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Main Author:	Anuar, Amir
Format:	Thesis
Language:	English English
Published:	2014
Subjects:	Bismuth compounds Ferrite - Magnetic properties Dielectrics
Online Access:	http://psasir.upm.edu.my/id/eprint/50047/1/FS%202014%2028RR_organized.pdf
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spelling	my-upm-ir.500472024-09-03T04:23:37Z Influence of Nd and Er substitution on magnetic and dielectric properties of bismuth ferrite 2014-03 Anuar, Amir BiFeO3 (BFO) is one of the few multiferroic materials with ferroelectric and antiferromagnetic order at room temperature. It can be applied to many modern technologies, such as information storage and sensing devices. In general, BiFeO3 doped with rare earth elements can enhance the ferroelectric and ferromagnetic. In this thesis the structural changes, magnetic and dielectric properties of Nd and Er doped bismuth ferrite powders have been studied. BiFe1-nNdnO3 (n = 0.00, 0.10, 0.20, 0.30, 0.40) and BiFe1-nErnO3 (n = 0.00, 0.10, 0.20, 0.30, 0.40) were prepared by using conventional solid state method. The samples are then characterized by X-ray diffraction (XRD), EDX, VSM and impendence analyzer. The X-ray diffraction for Nd substituted BiFeO3 showed that the lattice constants and cell volume decreased with each substitution, and the crystal structure transformed from the R3c (hexagonal) to the R-3m (hexagonal) with the Nd content x increasing to 0.3. Hysteresis loop appear when the Nd is substituted for Fe showing ferromagnetic properties. Nd substitutions introduce the presence of uncompensated antiferromagnetic spin. At 100Hz in room temperature the pure bismuth ferrite dielectric permittivity is 26.281. When 0.1 Nd is substituted it increase to 33.079 and at 0.2 Nd substitutions it further increase to 38.75 when 0.2 Nd is substituted while at 0.3 and 0.4 the dielectric permittivity decrease to 23.082 and 17.682 respectively. When 0.3 of Nd is substituted the crystal structures change from R3c to R-3m which reduces the dielectric properties where R3c allow cooperative displacement of Fe3+ for polarization. X-ray diffraction showed that substitution of Er for Fe promotes the formation of Bi24Fe2O39 phase. When the Er content increases to 0.30, BiFeO3 structure transforms from R3c(hexagonal) to Bi24Fe2O39 I23(Cubic). The magnetic properties show improvement with every substitution especially at 0.3 where cubic crystal structure is easily magnetizes. Dielectric permittivity of Er doped BiFeO3 see a reduction with every substitution. The decline is associated with Bi24Fe2O39 which has a high leakage current is associated with it. Bismuth compounds Ferrite - Magnetic properties Dielectrics 2014-03 Thesis http://psasir.upm.edu.my/id/eprint/50047/ http://psasir.upm.edu.my/id/eprint/50047/1/FS%202014%2028RR_organized.pdf text en public masters Universiti Putra Malaysia Bismuth compounds Ferrite - Magnetic properties Dielectrics Shaari, Abdul Halim English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
advisor	Shaari, Abdul Halim
topic	Bismuth compounds Ferrite - Magnetic properties Dielectrics
spellingShingle	Bismuth compounds Ferrite - Magnetic properties Dielectrics Anuar, Amir Influence of Nd and Er substitution on magnetic and dielectric properties of bismuth ferrite
description	BiFeO3 (BFO) is one of the few multiferroic materials with ferroelectric and antiferromagnetic order at room temperature. It can be applied to many modern technologies, such as information storage and sensing devices. In general, BiFeO3 doped with rare earth elements can enhance the ferroelectric and ferromagnetic. In this thesis the structural changes, magnetic and dielectric properties of Nd and Er doped bismuth ferrite powders have been studied. BiFe1-nNdnO3 (n = 0.00, 0.10, 0.20, 0.30, 0.40) and BiFe1-nErnO3 (n = 0.00, 0.10, 0.20, 0.30, 0.40) were prepared by using conventional solid state method. The samples are then characterized by X-ray diffraction (XRD), EDX, VSM and impendence analyzer. The X-ray diffraction for Nd substituted BiFeO3 showed that the lattice constants and cell volume decreased with each substitution, and the crystal structure transformed from the R3c (hexagonal) to the R-3m (hexagonal) with the Nd content x increasing to 0.3. Hysteresis loop appear when the Nd is substituted for Fe showing ferromagnetic properties. Nd substitutions introduce the presence of uncompensated antiferromagnetic spin. At 100Hz in room temperature the pure bismuth ferrite dielectric permittivity is 26.281. When 0.1 Nd is substituted it increase to 33.079 and at 0.2 Nd substitutions it further increase to 38.75 when 0.2 Nd is substituted while at 0.3 and 0.4 the dielectric permittivity decrease to 23.082 and 17.682 respectively. When 0.3 of Nd is substituted the crystal structures change from R3c to R-3m which reduces the dielectric properties where R3c allow cooperative displacement of Fe3+ for polarization. X-ray diffraction showed that substitution of Er for Fe promotes the formation of Bi24Fe2O39 phase. When the Er content increases to 0.30, BiFeO3 structure transforms from R3c(hexagonal) to Bi24Fe2O39 I23(Cubic). The magnetic properties show improvement with every substitution especially at 0.3 where cubic crystal structure is easily magnetizes. Dielectric permittivity of Er doped BiFeO3 see a reduction with every substitution. The decline is associated with Bi24Fe2O39 which has a high leakage current is associated with it.
format	Thesis
qualification_level	Master's degree
author	Anuar, Amir
author_facet	Anuar, Amir
author_sort	Anuar, Amir
title	Influence of Nd and Er substitution on magnetic and dielectric properties of bismuth ferrite
title_short	Influence of Nd and Er substitution on magnetic and dielectric properties of bismuth ferrite
title_full	Influence of Nd and Er substitution on magnetic and dielectric properties of bismuth ferrite
title_fullStr	Influence of Nd and Er substitution on magnetic and dielectric properties of bismuth ferrite
title_full_unstemmed	Influence of Nd and Er substitution on magnetic and dielectric properties of bismuth ferrite
title_sort	influence of nd and er substitution on magnetic and dielectric properties of bismuth ferrite
granting_institution	Universiti Putra Malaysia
publishDate	2014
url	http://psasir.upm.edu.my/id/eprint/50047/1/FS%202014%2028RR_organized.pdf
_version_	1811767760225566720

Influence of Nd and Er substitution on magnetic and dielectric properties of bismuth ferrite

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