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http://www.repositorio.cdtn.br:8080/jspui/handle/123456789/522| Title: | Structure and magnetic properties of nanostructured Ni-ferrite |
| Title of periodic: | Journal of Magnetism and Magnetic Materials Amsterdam |
| Authors: | Albuquerque, Adriana Silva de Ardisson, José Domingos Macedo, Waldemar Augusto de Almeida Lopez, J.L. Paniago, R. Persiano, A.I.C. |
| Affiliation: | Centro de Desenvolvimento da Tecnologia Nuclear/CDTN,Belo Horizonte, MG, Brasil Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil Centro de Desenvolvimento da Tecnologia Nucler/CDTN, Belo Horizonte/MG, Brasil Universidade Fedral de Minas Gerais/UFMG, Belo Horizonte, MG, Brasil Universidade Federal de Minas Gerais/UFMG, Belo Horizonte, MG, Brasil Universidade Federal de Minas Gerais/UFMG,Belo Horizonte, MG, Brasil |
| Issue Date: | 2001 |
| Keywords: | Ferrites;Moessbauer effect;magnetic properties |
| Abstract: | The structural and magnetic properties of NiFe2 O-4 ultrafine powders synthesized by coprecipitation, a nonconventional method of preparation, were investigated. The samples were obtained by annealing at relatively low temperatures (300-600 degreesC) and characterized by X-ray diffraction, Moessbauer spectroscopy, and vibrating sample magnetometry. The average particle diameter ranges from 4 to 15 nm, as determined by X-ray diffraction. All nanometric powder samples presented strong superparamagnetic relaxation at room temperature and reduced magnetic hyperfine fields at-193 degreesC. Magnetometry measurements indicated different magnetic behavior related with crystallinity of samples, coercivity as high as 168 Oe at 27degreesC, value that is nearly two times higher than coercivity of bulk Ni-ferrite. |
| Access: | L |
| Appears in Collections: | Artigo de periódico |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| Art-05_Adriana_SAlbuquerque.pdf | 107.91 kB | Adobe PDF | View/Open |
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