UPM Institutional Repository

Structural and magnetic properties evolution of fine-grained Ni0.5Zn0.5Fe2O4 series synthesized via mechanical alloying


Citation

Ismail, Ismayadi and Hashim, Mansor (2011) Structural and magnetic properties evolution of fine-grained Ni0.5Zn0.5Fe2O4 series synthesized via mechanical alloying. Australian Journal of Basic and Applied Sciences, 5 (11). pp. 1865-1877. ISSN 1991-8178

Abstract

Spinel ferrite powders with a composition of Ni0.5Zn0.5Fe2O4 were prepared by the mechanical alloying method and sintering process. The samples began to shrink at sintering temperatures 500°C-800°C. The increasing trend of average grain size was observed after 900°C and this is consistent with the results obtained for theoretical density (%Dth) and porosity. The drop of the density for 1300°C and 1400°C was due to intragranular pores which can be seen from the SEM micrographs. The activation energy of the sintering temperature for alloyed samples showed a low value compared to the micron size starting powder via the conventional solid state process. The XRD data provided information on the phase purity. A critical region of sintering temperature for the development of magnetic properties was observed at 800°C and 900°C with the sigmoid B-H curve shape taken to indicate a strong magnetic order, it is proposed that the first occurrence of significant ferromagnetism in the samples required that at least three basic conditions have been attained; a pure single phase, sufficiently large grains to support the existence of magnetic domains and a sufficient number of such grains.


Download File

[img]
Preview
PDF (Abstract)
Structural and Magnetic properties evolution of fine.pdf

Download (85kB) | Preview
Official URL or Download Paper: http://ajbasweb.com/old/ajbas_November_2011.html

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
Publisher: American-Eurasian Network for Scientific Information
Keywords: Mechanical alloying; Sintering temperature; Microstructure evolution
Depositing User: Nur Farahin Ramli
Date Deposited: 16 Aug 2013 08:53
Last Modified: 05 Jul 2017 01:55
URI: http://psasir.upm.edu.my/id/eprint/24941
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item