Synthesis and characterisation of magnetic iron sulfide nanocrystals
| Autor: | John H. L. Beal, Pablo G. Etchegoin, Richard D. Tilley |
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| Rok vydání: | 2012 |
| Předmět: |
Hexagonal prism
Materials science Magnetic domain Magnetism Iron sulfide Nanotechnology Coercivity Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry.chemical_compound chemistry Nanocrystal Chemical engineering Oleylamine Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Superparamagnetism |
| Zdroj: | Journal of Solid State Chemistry. 189:57-62 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2012.01.015 |
| Popis: | Fe1−xS and Fe3S4 nanocrystals with a variety of morphologies and average sizes were synthesised by the reaction of iron(II) acetylacetonate (Fe(acac)2) and elemental sulfur in oleylamine. Reaction at 200 °C for 240 min produced extremely thin Fe3S4 sheets, which displayed low coercivities (14 kA m−1) suggestive of pseudosingle-domain or multidomain particles. Reaction temperatures ≥300 °C for 30 min produced 70 nm Fe1−xS nanocrystals with hexagonal plate and hexagonal prism morphologies, which displayed high magnetic coercivities (110 kA m−1) characteristic of single magnetic domain particles. Rapid injection of sulfur solution at 280 °C followed by immediate cooling produced a mixture of Fe1−xS nanocrystals and spherical, polydisperse ∼5 nm Fe3S4 nanocrystals, which displayed superparamagnetism above an average blocking temperature of 55 K. |
| Databáze: | OpenAIRE |
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