Surface effects of metallic iron particles in zeolite NaX

V. Schünemann*, H. Winkler, Ch Butzlaff, A. X. Trautwein

*Corresponding author for this work
6 Citations (Scopus)


In situ Mössbauer, magnetization, ferromagnetic resonance and small-angle X-ray scattering measurements are used to characterize iron particles in the zeolite NaX, prepared by thermal decomposition of Fe(CO)5. The examined system shows a bimodal size distribution of superparamagnetic α-Fe particles with mean diameters of 1.2+-0.1 nm located inside the supercages and 3.0 ±1.0 nm located in defect sites of the zeolite. An enhancement of the saturation magnetization of the smaller particles by about 30% with respect to the bulk value has been observed. This enhancement is most likely due to surface effects of ultra-small particles in which 90% of the atoms are surface atoms.

Original languageEnglish
JournalHyperfine Interactions
Issue number1
Pages (from-to)1427-1432
Number of pages6
Publication statusPublished - 01.12.1994


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