ZnFe 2O 4: Rapid and sub-100 °c synthesis and anneal-tuned magnetic properties

Ranajit Sai, Suresh D. Kulkarni, K. J. Vinoy, Navakanta Bhat, S. A. Shivashankar

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Abstract

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 ∼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.

Original languageEnglish
Pages (from-to)2149-2156
Number of pages8
JournalJournal of Materials Chemistry
Volume22
Issue number5
DOIs
Publication statusPublished - 07-02-2012

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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