High-temperature Mossbauer spectroscopy of mechanically milled NiFe2O4

O. Helgason, Jianzhong Jiang

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Oxide spinels, in particular those containing iron, often exhibit technically important electrical- and magnetic-properties. We report here on X-ray powder diffraction and Mossbauer studies of nanostructured NiFe2O4 particles prepared by high-energy ball milling from bulk NiFe2O4, which is an inverse spinel. The Mossbauer spectra were recorded in situ at different temperatures in the range of 300-850 K. The Mossbauer spectra of the milled samples show a broad distribution of magnetic hyperfine fields together with a paramagnetic state at room temperature. Initially, at 700 K the spectrum is mainly paramagnetic, but during the process of annealing, magnetic sextets emerge. The treatment results in a significant change in the B/A area ratio of the ferrite. The Neel temperature of the samples is estimated from the B(T) relation to be in the range of 800-850 K.
Original languageEnglish
JournalHyperfine interactions
Volume139
Issue number1-4
Pages (from-to)325-333
ISSN0304-3843
Publication statusPublished - 2002

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