Magnetic Nanoparticles in MCM-41 Type Mesoporous Silica |
| Z. Surowiec a, B. Bierska-Piech b, M. Wiertel a, M. Budzyński a and J. Goworek c a Institute of Physics, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland b Institute of Materials Science, University of Silesia, Bankowa 12, 40-007 Katowice, Poland c Department of Adsorption, Faculty of Chemistry, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland |
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| Received: 08 06 2008 |
| Structural phase transformations and magnetic properties of mesoporous MCM-41 template modified with iron and nickel salts were studied by nitrogen physisorption, X-ray diffraction, Mössbauer spectroscopy and transmission electron microscopy. The FeNi-oxide or the bimetallic crystal structure is formed for low and high Ni concentrations, respectively. The average size of nanoparticles is about 10 nm. About 70% of particles exist in a superparamagnetic state at room temperature. |
| DOI: 10.12693/APhysPolA.114.1605 PACS numbers: 78.67.Bf, 81.07.Bc, 76.80.+y |