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Magnetism and Mössbauer study of formation of multi-core Y-Fe2O3 nanoparticles

Abstract: A systematic investigation of magnetic nanoparticles and the formation of a core-shell structure, consisting of multiple maghemite (Y-Fe2O3) 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 Mössbauer 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 Y-Fe2O3 nanoparticles show similar behavior to isolated particles of the same size.

 Autoría: Kamali S., Bringas E., Hah H., Bates B., Johnson J., Johnson C., Stroeve P.,

 Fuente: Journal of Magnetism and Magnetic Materials, 2018, 451, 131-136

Editorial: Elsevier

 Fecha de publicación: 01/04/2018

Nº de páginas: 11

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.jmmm.2017.10.102

ISSN: 0304-8853,1873-4766

Url de la publicación: https://doi.org/10.1016/j.jmmm.2017.10.102

Autores/as

KAMALI, SAEED

HAH, HIEN-YOONG

BATES, BRIAN

JOHNSON, JACQUELINE A.

JOHNSON, CHARLES E.

PIETER STROEVE