Effect of milling atmosphere on structural and magnetic properties of Ni–Zn ferrite nanocrystalline

doi:10.1088/1674-1056/24/4/048102

Abstract Powder mixtures of Zn, NiO, and Fe₂O₃ are mechanically alloyed by high energy ball milling to produce Ni-Zn ferrite with a nominal composition of Ni_0.36Zn_0.64Fe₂O₄. The effects of milling atmospheres (argon, air, and oxygen), milling time (from 0 to 30 h) and heat treatment are studied. The products are characterized using x-ray diffractometry, field emission scanning electron microscopy equipped with energy-dispersive x-ray spectroscopy, and transmitted electron microscopy. The results indicate that the desired ferrite is not produced during the milling in the samples milled under either air or oxygen atmospheres. In those samples milled under argon, however, Zn/NiO/Fe₂O₃ reacts with a solid-state diffusion mode to produce Ni-Zn ferrite nanocrystalline in a size of 8 nm after 30-h-milling. The average crystallite sizes decrease to 9 nm and 10 nm in 30-h-milling samples under air and oxygen atmospheres, respectively. Annealing the 30-h-milling samples at 600 ℃ for 2 h leads to the formation of a single phase of Ni-Zn ferrite, an increase of crystallite size, and a reduction of internal lattice strain. Finally, the effects of the milling atmosphere and heating temperature on the magnetic properties of the 30-h-milling samples are investigated.

Keywords: Ni-Zn ferrite nanocrystalline mechanical alloying milling atmosphere milling time magnetic property

Received: 30 September 2014
Revised: 08 November 2014
Accepted manuscript online:

PACS:	81.20.Ev	(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
	81.40.Rs	(Electrical and magnetic properties related to treatment conditions)
	91.60.Pn	(Magnetic and electrical properties)
	92.70.Cp	(Atmosphere)

Fund: Project supported by the University Putra Malaysia Graduate Research Fellowship Section.

Corresponding Authors: Abdollah Hajalilou
E-mail: e.hajalilou@yahoo.com

Cite this article:

Abdollah Hajalilou, Mansor Hashim, Reza Ebrahimi-Kahrizsangi, Mohamad Taghi Masoudi Effect of milling atmosphere on structural and magnetic properties of Ni–Zn ferrite nanocrystalline 2015 Chin. Phys. B 24 048102

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Effect of milling atmosphere on structural and magnetic properties of Ni–Zn ferrite nanocrystalline

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