Magnetism and Mössbauer study of formation of multi-core γ-Fe2O3 nanoparticles
| Autor: | Charles E. Johnson, Hien-Yoong Hah, Saeed Kamali, Jacqueline A. Johnson, Brian Bates, Eugenio Bringas, Pieter Stroeve |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Magnetism Maghemite Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Magnetization Nuclear magnetic resonance Transmission electron microscopy Mössbauer spectroscopy engineering Physical chemistry Magnetic nanoparticles 0210 nano-technology High-resolution transmission electron microscopy |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 451:131-136 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2017.10.102 |
| Popis: | A systematic investigation of magnetic nanoparticles and the formation of a core-shell structure, consisting of multiple maghemite ( γ - Fe 2 O 3 ) nanoparticles as the core and silica as the shell, has been performed using various techniques. High-resolution transmission electron microscopy clearly shows isolated maghemite nanoparticles with an average diameter of 13 nm and the formation of a core-shell structure. Low temperature Mossbauer spectroscopy reveals the presence of pure maghemite nanoparticles with all vacancies at the B-sites. Isothermal magnetization and zero-field-cooled and field-cooled measurements are used for investigating the magnetic properties of the nanoparticles. The magnetization results are in good accordance with the contents of the magnetic core and the non-magnetic shell. The multiple-core γ - Fe 2 O 3 nanoparticles show similar behavior to isolated particles of the same size. |
| Databáze: | OpenAIRE |
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