Electronic Structure and Chemistry of Iron-Based Metal Oxide Nanostructured Materials: A NEXAFS Investigation of BiFeO3, Bi2Fe4O9, a-Fe2O3, g-Fe2O3, and Fe/Fe3O4

Published

November 6, 2008

Author(s)

Tae-Jin Park, S Sambasivan, Daniel A. Fischer, R Ramesh, J A. Misewich, S S. Wong

Abstract

We present a systematic and detailed Near Edge X-ray Absorption Fine Structure (NEXAFS) experimental investigation of the electronic structure and chemistry of iron-based metal oxide nanostructured (FeMONS) materials including BiFeO3, Bi2Fe4O9, a-Fe2O3, ?- Fe2O3, and Fe/Fe3O4. Correlations of the electronic structure and structural chemistry of these intriguing nanomaterials are presented, ranging from the nano to the bulk scale. In this work, variations in the shape, position, and intensity of the O K-edge and Fe L-edge NEXAFS spectra have been analyzed in terms of electronic structure and surface chemistry of the FeMONS materials as compared with that of the bulk. We hypothesize that surface imperfection and surface strain anisotropies in nanoparticles induce distortion and site inequivalency of the oxygen Oh sites around the Fe ion located close to the surface, resulting in an increase in the degree of multiplicity as well as in non- stoichiometry effects in FeMONS materials.

Citation

Journal of Physical Chemistry C

Volume

112

Pub Type

Journals

Keywords

iron oxides, nanostructured materials, NEXAFS

Citation

Park, T. , Sambasivan, S. , Fischer, D. , Ramesh, R. , Misewich, J. and Wong, S. (2008), Electronic Structure and Chemistry of Iron-Based Metal Oxide Nanostructured Materials: A NEXAFS Investigation of BiFeO3, Bi2Fe4O9, a-Fe2O3, g-Fe2O3, and Fe/Fe3O4, Journal of Physical Chemistry C (Accessed December 13, 2024)