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ZnFe(2)O(4): Rapid and sub-100 degrees C synthesis and anneal-tuned magnetic properties

Sai, Ranajit and Kulkarni, Suresh D and Vinoy, KJ and Bhat, Navakanta and Shivashankar, SA (2012) ZnFe(2)O(4): Rapid and sub-100 degrees C synthesis and anneal-tuned magnetic properties. In: Journal of Materials Chemistry, 22 (5). pp. 2149-2156.

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Nanocrystalline zinc ferrite (ZFO) has been synthesized from metal acetylacetonates by microwave irradiation for 5 min in the presence of a surfactant. The as-prepared material is ZFO and has been subjected in air to conventional furnace annealing and to rapid annealing at different temperatures. Both annealing protocols lead to well-crystallized ZFO, with crystallite sizes in the range similar to 8-20 nm, which is ferrimagnetic, even at room temperature, with magnetization attaining saturation. While the magnetization M(S) of conventionally annealed ZFO varies with crystallite size in the expected manner, rapid annealing leads to high M(S) even when the crystallite size is relatively large. The coercivity is greater in the conventionally annealed ZFO. Thermal and magnetic measurements suggest that the inhomogeneous site cationic distribution within each crystallite caused by rapid annealing can be used to tailor the magnetic behaviour of nanocrystalline ferrites.

Item Type: Journal Article
Publication: Journal of Materials Chemistry
Publisher: Royal Society of Chemistry
Additional Information: Copyright of this article belongs to Royal Society of Chemistry.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Electrical Sciences > Electrical Communication Engineering
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 03 Feb 2012 12:29
Last Modified: 03 Feb 2012 12:29
URI: http://eprints.iisc.ac.in/id/eprint/43391

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