Please use this identifier to cite or link to this item: 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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