Structural, electrical and magnetic properties of bismuth ferrite ceramics substituted with yttrium and indium

Multiferroic materials demonstrate the simultaneous presence of ferromagnetic, ferroelectric, or ferroelastic orderings. BiFeO3 (BFO) is one of the significant multiferroic materials with high TC ~ 1103 K and TN ~ 643 K at room temperature. BFO suffers high leakage current and weak ferromagnetic...

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Main Author:	Najm, Ammar Abd Ali
Format:	Thesis
Language:	English
Published:	2016
Subjects:	Bismuth compounds Ferrite - Magnetic properties Dielectrics
Online Access:	http://psasir.upm.edu.my/id/eprint/69116/1/FS%202016%2042%20IR.pdf
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spelling	my-upm-ir.691162019-07-08T00:32:18Z Structural, electrical and magnetic properties of bismuth ferrite ceramics substituted with yttrium and indium 2016-10 Najm, Ammar Abd Ali Multiferroic materials demonstrate the simultaneous presence of ferromagnetic, ferroelectric, or ferroelastic orderings. BiFeO3 (BFO) is one of the significant multiferroic materials with high TC ~ 1103 K and TN ~ 643 K at room temperature. BFO suffers high leakage current and weak ferromagnetic and ferroelectric properties. This study was aimed to synthesize BiFe1-xMxO3 (M = Y3+, In3+) samples; where x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8 and 1.0, investigate their phase formation due to Y3+ and In3+ substitution as well as their magnetic and electrical properties. Solid-state technique was used to synthesize BiFe1-xMxO3, (M = Y3+, In3+) using Bi2O3, Fe2O3, Y2O3 and In2O3 as raw materials. XRD, SEM and EDX were used to determine the crystal structure, morphology of the grain size and elemental compositions respectively. Their leakage current, dielectric and magnetic properties were quantified by Keithley source measure unit, Impedance analyzer and VSM respectively. XRD revealed the hexagonal single phase of pure BFO. The phase changed to cubic with Y3+ substitution and BFO remains the primary phase until x = 0.2. Substitution of In3+ promotes the growth of Bi25FeO40, and BFO remains the primary phase until x = 0.4. For SEM results, the average grain size of pure BFO decreased from 2.04 to 0.29 μm with Y3+ substitution, while it decreases to 0.32 μm for In3+ substitution. EDX revealed no impurities in the pure and substituted samples. From magnetic analysis, pure BFO shows antiferromagnetic behavior. A maximum Ms value of 2.9 emu/g and Mr of 0.09 were observed with Y3+ substitution at x = 0.2. The magnetic properties showed nonlinear dependent on In3+ substitution. The highest Ms value of 0.0405 emu/g and Mr of 6.22 × 10-4 emu/g was achieved at x = 0.3. The dielectric measurement showed that the εʹr of the samples increased from 26.5 at x = 0 to 105 at x = 0.4, with Y3+ substitution. The values also improved with In3+ substitution and reached an optimum value of 372 at x = 0.6. The J-E measurement revealed that the leakage current density, J of x = 1.0 (4.6 × 10-8 A/cm2) substituted with Y3+ is decreased significantly by about four order of magnitude compared to that of x = 0 (9.24 × 10-4 A/cm2). Moreover, the J of x = 1.0 (1.51× 10-6 A/cm2) substituted with In3+ is decreased significantly by about three order of magnitude compared to that of x = 0 (9.24 × 10-4 A/cm2). In conclusion, substituted BFO ceramics possess improved dielectric, magnetic properties and has reduced the leakage current. The prepared ceramics could be employed for several applications such as disk read/write heads and ceramic pressure sensor. Bismuth compounds Ferrite - Magnetic properties Dielectrics 2016-10 Thesis http://psasir.upm.edu.my/id/eprint/69116/ http://psasir.upm.edu.my/id/eprint/69116/1/FS%202016%2042%20IR.pdf text en public masters Universiti Putra Malaysia Bismuth compounds Ferrite - Magnetic properties Dielectrics
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Bismuth compounds Ferrite - Magnetic properties Dielectrics
spellingShingle	Bismuth compounds Ferrite - Magnetic properties Dielectrics Najm, Ammar Abd Ali Structural, electrical and magnetic properties of bismuth ferrite ceramics substituted with yttrium and indium
description	Multiferroic materials demonstrate the simultaneous presence of ferromagnetic, ferroelectric, or ferroelastic orderings. BiFeO3 (BFO) is one of the significant multiferroic materials with high TC ~ 1103 K and TN ~ 643 K at room temperature. BFO suffers high leakage current and weak ferromagnetic and ferroelectric properties. This study was aimed to synthesize BiFe1-xMxO3 (M = Y3+, In3+) samples; where x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8 and 1.0, investigate their phase formation due to Y3+ and In3+ substitution as well as their magnetic and electrical properties. Solid-state technique was used to synthesize BiFe1-xMxO3, (M = Y3+, In3+) using Bi2O3, Fe2O3, Y2O3 and In2O3 as raw materials. XRD, SEM and EDX were used to determine the crystal structure, morphology of the grain size and elemental compositions respectively. Their leakage current, dielectric and magnetic properties were quantified by Keithley source measure unit, Impedance analyzer and VSM respectively. XRD revealed the hexagonal single phase of pure BFO. The phase changed to cubic with Y3+ substitution and BFO remains the primary phase until x = 0.2. Substitution of In3+ promotes the growth of Bi25FeO40, and BFO remains the primary phase until x = 0.4. For SEM results, the average grain size of pure BFO decreased from 2.04 to 0.29 μm with Y3+ substitution, while it decreases to 0.32 μm for In3+ substitution. EDX revealed no impurities in the pure and substituted samples. From magnetic analysis, pure BFO shows antiferromagnetic behavior. A maximum Ms value of 2.9 emu/g and Mr of 0.09 were observed with Y3+ substitution at x = 0.2. The magnetic properties showed nonlinear dependent on In3+ substitution. The highest Ms value of 0.0405 emu/g and Mr of 6.22 × 10-4 emu/g was achieved at x = 0.3. The dielectric measurement showed that the εʹr of the samples increased from 26.5 at x = 0 to 105 at x = 0.4, with Y3+ substitution. The values also improved with In3+ substitution and reached an optimum value of 372 at x = 0.6. The J-E measurement revealed that the leakage current density, J of x = 1.0 (4.6 × 10-8 A/cm2) substituted with Y3+ is decreased significantly by about four order of magnitude compared to that of x = 0 (9.24 × 10-4 A/cm2). Moreover, the J of x = 1.0 (1.51× 10-6 A/cm2) substituted with In3+ is decreased significantly by about three order of magnitude compared to that of x = 0 (9.24 × 10-4 A/cm2). In conclusion, substituted BFO ceramics possess improved dielectric, magnetic properties and has reduced the leakage current. The prepared ceramics could be employed for several applications such as disk read/write heads and ceramic pressure sensor.
format	Thesis
qualification_level	Master's degree
author	Najm, Ammar Abd Ali
author_facet	Najm, Ammar Abd Ali
author_sort	Najm, Ammar Abd Ali
title	Structural, electrical and magnetic properties of bismuth ferrite ceramics substituted with yttrium and indium
title_short	Structural, electrical and magnetic properties of bismuth ferrite ceramics substituted with yttrium and indium
title_full	Structural, electrical and magnetic properties of bismuth ferrite ceramics substituted with yttrium and indium
title_fullStr	Structural, electrical and magnetic properties of bismuth ferrite ceramics substituted with yttrium and indium
title_full_unstemmed	Structural, electrical and magnetic properties of bismuth ferrite ceramics substituted with yttrium and indium
title_sort	structural, electrical and magnetic properties of bismuth ferrite ceramics substituted with yttrium and indium
granting_institution	Universiti Putra Malaysia
publishDate	2016
url	http://psasir.upm.edu.my/id/eprint/69116/1/FS%202016%2042%20IR.pdf
_version_	1747812666324287488

Structural, electrical and magnetic properties of bismuth ferrite ceramics substituted with yttrium and indium

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