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Low-Temperature Magnetic Properties of Nanocomposites Containing Superparamagnetic Fe_3C Particles

100%

David B., Schneeweiss O., Šantavá E., Morjan I.

issue 5

766-767

Two nanopowders containing superparamagnetic Fe_3C particles, superparamagnetic Fe_3O_4/γ-Fe_2O_3 particles and carbon black phase were synthesised by the method of laser-induced homogeneous pyrolysis of gaseous precursors. Both were characterised by X-ray diffraction, Mössbauer spectrometry and standard magnetic measurements. The mean crystallite size of Fe_3C was 3 nm for the first sample and 10 nm for the second sample. Mössbauer spectra measured at 27 K and zero-field cooled/field cooled curves measured down to 4 K are reported.

Low-Temperature Magnetic Properties of Nanometric Fe-Based Particles

88%

David B., Schneeweiss O., Šantavá E., Alexandrescu R., Morjan I.

Acta Physica Polonica A

2008

vol. 113

issue 1

561-564

Fe-based nanoparticles were prepared by laser-driven pyrolysis. The as-synthesised powder consists ofα-Fe and Fe_3O_4/γ-Fe_2O_3 nanoparticles embedded in a pyrolytic carbon matrix. The crystallite size of 1.8 nm forα-Fe was calculated using the Scherrer formula. The as-synthesised nanopowder was superparamagnetic. The maximum of the zero-field cooling curve was observed at 32 K and the distribution of blocking temperatures g(T_B) peaked at 11 K. As a result of small particle sizes and the soft matrix, the Lamb-Mössbauer factor f was significantly higher at 4 K than at 293 K.

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2 Acta Physica Polonica A

1 2010

1 2008

2 David B.

2 Morjan I.

2 Schneeweiss O.

2 Šantavá E.

1 Alexandrescu R.

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Low-Temperature Magnetic Properties of Nanocomposites Containing Superparamagnetic Fe_3C Particles

Low-Temperature Magnetic Properties of Nanometric Fe-Based Particles