KUET Institutional Repository

Study of Nanocrystalline Formation of Magnetic Properties in fe72.5ag2nb3si13.5b9 Metallic Ribbon

Show simple item record

dc.contributor.advisor Sikder, Prof. Dr. Shibendra Shekher
dc.contributor.author Tawhid, Md. Mahmuduzzaman
dc.date.accessioned 2018-05-24T03:41:58Z
dc.date.available 2018-05-24T03:41:58Z
dc.date.copyright 2017
dc.date.issued 2017-03
dc.identifier.other ID 1555552
dc.identifier.uri http://hdl.handle.net/20.500.12228/168
dc.description This thesis is submitted to the Department of Physics, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Science in Physics, March 2017. en_US
dc.description Cataloged from PDF Version of Thesis.
dc.description Includes bibliographical references (pages 76-84).
dc.description.abstract This thesis focuses on the experimental investigation of the effect of grain size and phase constitution on the magnetic properties of Fe72.5Ag2Nb3Si13.5B9 alloys in the amorphous and annealed states. The sample has been prepared by rapid solidification technique and their amorphous nature has been confirmed by X-ray diffraction (XRD). The crystallization behavior and the nanocrystal formation have been studied by Differential Thermal Analysis (DTA) and XRD. Magnetization measurements have been carried out using vibrating sample magnetometer (VSM). The ribbon sample has been annealed in a controlled way in the temperature range 550oC to 750oC for 2 hours. DTA runs for the sample show the existence of one exothermic peak for α-Fe(Si) phase. Thermal analysis experiment and from the obtained data activation energy of primary crystallization products α-Fe(Si) phase is 5.78 eV. The XRD experiments are in order to study the effect of structural parameters such as lattice parameter, crystallites size and silicon content of the nanocrystalline α-Fe(Si) grain. In the optimized annealing condition the grain size has been obtained in the range of 50 - 69nm. The peak shift indicates the change of the values of Si-content of nanograins and therefore, the change of the lattice parameter of nanograins. The saturation magnetization (Ms) has been observed 114emu/gm and in as prepared condition Curie temperature (Tc) has been found to be 305oC. The critical composition for disappearance of ferromagnetism fall of curves Ms with the replacement Cu by Ag of FINEMET, where the nearest neighbor coupling to longer dominant and intermediate range occurs and the magnetization process of this amorphous ribbon sample are soft behavior of magnetic material. en_US
dc.description.statementofresponsibility Md. Mahmuduzzaman Tawhid
dc.format.extent 84 pages
dc.language.iso en_US en_US
dc.publisher Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh. en_US
dc.rights Khulna University of Engineering & Technology (KUET) thesis/ dissertation/internship reports are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission
dc.subject Magnetic properties en_US
dc.subject Metallic ribbon en_US
dc.subject Nanocrystalline
dc.title Study of Nanocrystalline Formation of Magnetic Properties in fe72.5ag2nb3si13.5b9 Metallic Ribbon en_US
dc.type Thesis en_US
dc.description.degree Master of Science in Physics
dc.contributor.department Department of Physics


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search KUET IR


Browse

My Account

Statistics