Dielectric And Magnetic Characterization Of (La0.5-Xprxba0.5)(Mn0.5ti0.5)O3 Perovskite As A Multiferroic Material Synthesized Via Solid State Technique

Alias, Nor Hayati (2009) Dielectric And Magnetic Characterization Of (La0.5-Xprxba0.5)(Mn0.5ti0.5)O3 Perovskite As A Multiferroic Material Synthesized Via Solid State Technique. Masters thesis, Universiti Putra Malaysia.

[img] PDF


A new manganate perovskite (La0.5-xPrxBa0.5)(Mn0.5Ti0.5)O3 has been prepared by ceramic solid-state technique at sintering temperature 1300 °C for 24 hours. The x concentration of Praseodymiun (Pr) in molar proportion in A site has been varied as x = 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 007, 0.08, 0.09, 0.1, 0.2, 0.3 and 0.4. The dielectric properties of the synthesized materials have been studied at frequency ranging from 5 Hz to 1 MHz from room temperature up to 200 °C. Furthermore, analyses have been carried out to determine the structural, magnetic and dielectric electrical properties of the synthesized material as a candidate of multiferroic material. Pr (Praseodymium) addition would promote liquid phase sintering in the synthesized samples. This enhanced the agglomeration and porosity formation in the bulk volume. The defects and conducting liquid present would generate traps that produce negative permittivity response at interfacial/space charge frequency region due to delay in transient current or situation in which inertial conducting current of the trap presents, exceeding the charging-discharging current component. The XRD (X-Ray Diffractometry) results indicate all samples possess a single phase monoclinic structure with space group P112. Multiferroic magnetodielectric coupling in material with ferromagnetic and high dielectric constant ( > 30) is able to achieve in sampel with x molar concentration = 0.07 at room temperature. The dielectric value obtained is 176 with loss tan δ value 0.62. SEM/EDX analysis of the sample shows fine grain microstructure and high manganese (Mn) content ( > 0.6 wt %) which favours the double exchange mechanism.

Item Type:Thesis (Masters)
Subject:Solids - Magnetic properties
Subject:Dielectrics - Magnetic properties
Chairman Supervisor:Abdul Halim Shaari, PhD
Call Number:FS 2009 37
Faculty or Institute:Faculty of Science
ID Code:11970
Deposited By: Mohd Nezeri Mohamad
Deposited On:19 Jul 2011 02:10
Last Modified:27 May 2013 07:50

Repository Staff Only: Edit item detail

Universiti Putra Malaysia Institutional Repository

Universiti Putra Malaysia Institutional Repository is an on-line digital archive that serves as a central collection and storage of scientific information and research at the Universiti Putra Malaysia.

Currently, the collections deposited in the IR consists of Master and PhD theses, Master and PhD Project Report, Journal Articles, Journal Bulletins, Conference Papers, UPM News, Newspaper Cuttings, Patents and Inaugural Lectures.

As the policy of the university does not permit users to view thesis in full text, access is only given to the first 24 pages only.