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Structural transformations of mechanically induced top-down approach BaFe12O19 nanoparticles synthesized from high crystallinity bulk materials

In this work, a top-down approach was applied to high crystallinity BaFe12O19 bulks, breaking them into smaller nanoparticles by mechanochemical route. The effects of milling time, reaction mechanisms and structural information were investigated. Interestingly, three distinct stages of the mechanoch...

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Main Authors: Low, Zhi Huang, Chen, Soo Kien, Ismail, Ismayadi, Tan, Kim Song, Liew, J. Y. C.
Format: Article
Language:English
Published: Elsevier 2017
Online Access:http://psasir.upm.edu.my/id/eprint/54549/1/Structural%20transformations%20of%20mechanically%20induced%20.pdf
http://psasir.upm.edu.my/id/eprint/54549/
https://www.sciencedirect.com/science/article/pii/S0304885316325525
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spelling my.upm.eprints.545492020-03-09T08:30:32Z http://psasir.upm.edu.my/id/eprint/54549/ Structural transformations of mechanically induced top-down approach BaFe12O19 nanoparticles synthesized from high crystallinity bulk materials Low, Zhi Huang Chen, Soo Kien Ismail, Ismayadi Tan, Kim Song Liew, J. Y. C. In this work, a top-down approach was applied to high crystallinity BaFe12O19 bulks, breaking them into smaller nanoparticles by mechanochemical route. The effects of milling time, reaction mechanisms and structural information were investigated. Interestingly, three distinct stages of the mechanochemical mechanism were observed. The XRD results indicated that the BaFe12O19 phase existed even though the mechanical energy had induced the formation of an amorphous phase in the material. The average crystallite size decreased during the first stage and the intermediate stage, and increased during the final stage of the mechanical alloying. A Rietveld refinement analysis suggested the deformation of a mechanically-triggered polyhedral in the magnetoplumbite structure. FESEM micrographs indicated that fragmentation predominated during the first and intermediate stages, until a steady equilibrium state was achieved at in the final stage, where a narrow particle size distribution was observed. HRTEM micrographs suggested the formation of a non-uniform nanostructure shell surrounding the ordered core materials at the edge-interface region. The thickness of the amorphous surface layer extended up to 12 nm during the first and intermediate stages, and diminished to approximately 3 nm after 20 h milling. VSM results showed a mixture of ferromagnetic, superparamagnetic, and paramagnetic behaviours. However, different magnetic behaviours predominated at different milling time, which strongly related to the defects, distorted polyhedra, and non-equilibrium amorphous layers of the material. Elsevier 2017-05 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/54549/1/Structural%20transformations%20of%20mechanically%20induced%20.pdf Low, Zhi Huang and Chen, Soo Kien and Ismail, Ismayadi and Tan, Kim Song and Liew, J. Y. C. (2017) Structural transformations of mechanically induced top-down approach BaFe12O19 nanoparticles synthesized from high crystallinity bulk materials. Journal of Magnetism and Magnetic Materials, 429. pp. 192-202. ISSN 0304-8853; ESSN: 1873-4766 https://www.sciencedirect.com/science/article/pii/S0304885316325525 10.1016/j.jmmm.2017.01.036
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description In this work, a top-down approach was applied to high crystallinity BaFe12O19 bulks, breaking them into smaller nanoparticles by mechanochemical route. The effects of milling time, reaction mechanisms and structural information were investigated. Interestingly, three distinct stages of the mechanochemical mechanism were observed. The XRD results indicated that the BaFe12O19 phase existed even though the mechanical energy had induced the formation of an amorphous phase in the material. The average crystallite size decreased during the first stage and the intermediate stage, and increased during the final stage of the mechanical alloying. A Rietveld refinement analysis suggested the deformation of a mechanically-triggered polyhedral in the magnetoplumbite structure. FESEM micrographs indicated that fragmentation predominated during the first and intermediate stages, until a steady equilibrium state was achieved at in the final stage, where a narrow particle size distribution was observed. HRTEM micrographs suggested the formation of a non-uniform nanostructure shell surrounding the ordered core materials at the edge-interface region. The thickness of the amorphous surface layer extended up to 12 nm during the first and intermediate stages, and diminished to approximately 3 nm after 20 h milling. VSM results showed a mixture of ferromagnetic, superparamagnetic, and paramagnetic behaviours. However, different magnetic behaviours predominated at different milling time, which strongly related to the defects, distorted polyhedra, and non-equilibrium amorphous layers of the material.
format Article
author Low, Zhi Huang
Chen, Soo Kien
Ismail, Ismayadi
Tan, Kim Song
Liew, J. Y. C.
spellingShingle Low, Zhi Huang
Chen, Soo Kien
Ismail, Ismayadi
Tan, Kim Song
Liew, J. Y. C.
Structural transformations of mechanically induced top-down approach BaFe12O19 nanoparticles synthesized from high crystallinity bulk materials
author_facet Low, Zhi Huang
Chen, Soo Kien
Ismail, Ismayadi
Tan, Kim Song
Liew, J. Y. C.
author_sort Low, Zhi Huang
title Structural transformations of mechanically induced top-down approach BaFe12O19 nanoparticles synthesized from high crystallinity bulk materials
title_short Structural transformations of mechanically induced top-down approach BaFe12O19 nanoparticles synthesized from high crystallinity bulk materials
title_full Structural transformations of mechanically induced top-down approach BaFe12O19 nanoparticles synthesized from high crystallinity bulk materials
title_fullStr Structural transformations of mechanically induced top-down approach BaFe12O19 nanoparticles synthesized from high crystallinity bulk materials
title_full_unstemmed Structural transformations of mechanically induced top-down approach BaFe12O19 nanoparticles synthesized from high crystallinity bulk materials
title_sort structural transformations of mechanically induced top-down approach bafe12o19 nanoparticles synthesized from high crystallinity bulk materials
publisher Elsevier
publishDate 2017
url http://psasir.upm.edu.my/id/eprint/54549/1/Structural%20transformations%20of%20mechanically%20induced%20.pdf
http://psasir.upm.edu.my/id/eprint/54549/
https://www.sciencedirect.com/science/article/pii/S0304885316325525
_version_ 1662756453820137472
score 13.211869

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