Chemical and Biomolecular Engineering Faculty Research

Title

Disappearing of the Verwey Transition in Magnetite Nanoparticles Synthesized under a Magnetic Feld: Implications for the Origin of Charge Ordering

Document Type

Article

Publication Date

Spring 2004

Abstract

It is observed that Fe3O4 nanoparticles exhibit a Verwey transition at approximately 120 K, in agreement with that observed in the corresponding bulk sample. While, the transition vanishes in the Fe3O4nanoparticles formed under a 0.25 T magnetic field. It is found that the magnetic field induced oxidation of part of the Fe2+ ions on octahedral sites from lower spin states to higher spin states (Fe3+) during the formation of the nanoparticles, and then resulted in the vanishing of charge ordering between Fe2+ and Fe3+on the octahedral sites below Verwey transition temperature (TV) due to lacking of Fe2+ in some layers.

Volume

390

Issue

3

First Page

55

Last Page

58