Structure of Iron Oxide Nanoparticles Studied by ^{57}Fe NMR

• Authors: P. Křišťan , V. Chlan , H. Štěpánková , R. Řezníček , P. Görnert , P. Payer
• Languages of publication: EN

Abstracts

EN

In this work we apply nuclear magnetic resonance (NMR) spectroscopy of ^{57}Fe nuclei for investigation of submicron and nanocrystalline iron oxide systems. The studied iron oxide particles are obtained from ferrous hydroxide gels (prepared from FeCl_{2} and KOH) by aging at elevated temperatures (90 °C) with KNO_{3} as oxidant. The ^{57}Fe NMR spectra of the samples are measured in temperature range 4.2-370 K in a zero external magnetic field. Signals of ^{57}Fe nuclei assigned to tetrahedral and octahedral iron sites are well resolved. The NMR spectra and their temperature dependences are compared with those of stoichiometric and nonstoichiometric magnetite single crystals, as well as with samples of maghemite.

Keywords

EN

76.60.-k; 75.50.Gg; 75.50.Tt

Discipline

• 76.60.-k: Nuclear magnetic resonance and relaxation(see also 33.25.+k Nuclear resonance and relaxation in atomic and molecular physics and 82.56.-b Nuclear magnetic resonance in physical chemistry and chemical physics; for structure determination using magnetic resonance techniques, see 61.05.Qr; for biophysical applications, see 87.80.Lg; for NMR in superconducting materials, see 74.25.nj)
• 75.50.Gg: Ferrimagnetics
• 75.50.Tt: Fine-particle systems; nanocrystalline materials

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 138-139

Dates

published

2014-07

Contributors

author

P. Křišťan

• Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

author

V. Chlan

• Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

author

H. Štěpánková

• Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

author

R. Řezníček

• Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

author

P. Görnert

• Innovent e.V. Technologieentwicklung, Prüssingstr. 27 B, D-07745 Jena, Germany

author

P. Payer

• Innovent e.V. Technologieentwicklung, Prüssingstr. 27 B, D-07745 Jena, Germany

References

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• [5] H. Štěpánková, K. Kouřil, V. Chlan, P. Görnert, R. Müller, J. Štěpánek, J. Magn. Magn. Mater. 322, 1323 (2010), doi: 10.1016/j.jmmm.2009.04.002
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Identifiers

DOI

10.12693/APhysPolA.126.138