Particle size determination of superparamagnetic alpha-Fe in carbon-supported catalysts by in situ Mössbauer spectroscopy

Helvig Christensen; Steen Mørup; Johannes W. Niemantsverdriet

doi:10.1021/j100269a002

Particle size determination of superparamagnetic alpha-Fe in carbon-supported catalysts by in situ Mössbauer spectroscopy

Helvig Christensen, Steen Mørup, Johannes W. Niemantsverdriet

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Abstract

Mössbauer spectra of a carbon-supported iron catalyst, consisting of 3.5 wt % Fe on the carbon black Carbolac-1, show that all metallic iron is superparamagnetic both at 300 and at 80 K. Spectra measured in applied magnetic fields up to 1 T confirm that the signal is due to α-Fe. Analysis of the magnetic field dependence of the spectra shows that the average diameter of the particles is 2.5 ± 0.2 nm. The sample is particularly suited for fundamental investigations of superparamagnetic relaxation and surface magnetism in metallic iron particles.

Original language	English
Pages (from-to)	4898-4900
Number of pages	3
Journal	Journal of Physical Chemistry
Volume	89
Issue number	23
DOIs	https://doi.org/10.1021/j100269a002
Publication status	Published - 1 Dec 1985

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abstract = "M{\"o}ssbauer spectra of a carbon-supported iron catalyst, consisting of 3.5 wt % Fe on the carbon black Carbolac-1, show that all metallic iron is superparamagnetic both at 300 and at 80 K. Spectra measured in applied magnetic fields up to 1 T confirm that the signal is due to α-Fe. Analysis of the magnetic field dependence of the spectra shows that the average diameter of the particles is 2.5 ± 0.2 nm. The sample is particularly suited for fundamental investigations of superparamagnetic relaxation and surface magnetism in metallic iron particles.",

author = "Helvig Christensen and Steen M{\o}rup and Niemantsverdriet, {Johannes W.}",

year = "1985",

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T1 - Particle size determination of superparamagnetic alpha-Fe in carbon-supported catalysts by in situ Mössbauer spectroscopy

AU - Christensen, Helvig

AU - Mørup, Steen

AU - Niemantsverdriet, Johannes W.

PY - 1985/12/1

Y1 - 1985/12/1

N2 - Mössbauer spectra of a carbon-supported iron catalyst, consisting of 3.5 wt % Fe on the carbon black Carbolac-1, show that all metallic iron is superparamagnetic both at 300 and at 80 K. Spectra measured in applied magnetic fields up to 1 T confirm that the signal is due to α-Fe. Analysis of the magnetic field dependence of the spectra shows that the average diameter of the particles is 2.5 ± 0.2 nm. The sample is particularly suited for fundamental investigations of superparamagnetic relaxation and surface magnetism in metallic iron particles.

AB - Mössbauer spectra of a carbon-supported iron catalyst, consisting of 3.5 wt % Fe on the carbon black Carbolac-1, show that all metallic iron is superparamagnetic both at 300 and at 80 K. Spectra measured in applied magnetic fields up to 1 T confirm that the signal is due to α-Fe. Analysis of the magnetic field dependence of the spectra shows that the average diameter of the particles is 2.5 ± 0.2 nm. The sample is particularly suited for fundamental investigations of superparamagnetic relaxation and surface magnetism in metallic iron particles.

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U2 - 10.1021/j100269a002

DO - 10.1021/j100269a002

M3 - Article

SN - 0022-3654

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EP - 4900

JO - Journal of Physical Chemistry

JF - Journal of Physical Chemistry

IS - 23

ER -

Particle size determination of superparamagnetic alpha-Fe in carbon-supported catalysts by in situ Mössbauer spectroscopy

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