NMR analysis of ferromagnets: Fe oxides

被引：21

作者：

Bastow, T. J. ^{[1
]}

Trinchi, A. ^{[1
]}

机构：

[1] CSIRO Mat Sci & Engn, Clayton, Vic 3169, Australia

来源：

SOLID STATE NUCLEAR MAGNETIC RESONANCE | 2009年 / 35卷 / 01期

关键词：

Fe-57; NMR; Ferromagnetism; Iron oxides; RESONANCE; FE-57; MOSSBAUER; MAGNETITE; SPECTRA;

D O I：

10.1016/j.ssnmr.2008.10.005

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A short historical review is given on internal field NMR of ferromagnets, illustrated with recent pulsed NMR spectra of the elemental ferromagnets Fe, Co and Ni and the Fe-oxides magnetite, maghemite and hematite, which, with the exception of maghemite, have resonance frequencies first reported over 45 years ago. Since the magnetic hyperfine field at the nucleus is not known a priori, the original search frequency motivations are discussed along with the mechanisms for the initially much larger than expected (similar to 10(3)) NMR signals that were observed. The Fe-57 spectra of the three principal Fe-oxide ferromagnets, magnetite (Fe3O4), maghemite (gamma-Fe2O3) and hematite (alpha-Fe2O3), obtained here under uniform spectroscopic conditions, are then discussed in more detail, with a focus on the influence of particle size and vacancy content on the hyperfine fields (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：25 / 31

页数：7