Please use this identifier to cite or link to this item: http://www.repositorio.cdtn.br:8080/jspui/handle/123456789/521
Title: High coercivity in a new molecular iron-based magnet
Title of periodic: Polyhedron New York
Authors: Vaz, Maria das Graças F.
Ardisson, José Domingos
Speziali, N.L.
Souza, G.P.
Stumpf, H.O.
Knobel, M.
Macedo, Waldemar Augusto de Almeida
Affiliation: Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Universidade Federal 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
Universidade Estadual de Campinas/UNICAMP, Campinas, SP, Brasil
Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Issue Date: 2001
Keywords: Molecules;magnets;magnetic properties;Moessbauer effect
Abstract: A new molecule-based magnet containing Fe(II), Fe(III) and Cu(opba)2- (opba=ortho-phenylenebis(oxamato)) was synthesized. The samples were characterized by infrared spectroscopy, elemental analysis, atomic absorption, macroscopic magnetometry, X-ray diffraction, and 57Fe Moùssbauer spectroscopy. Magnetic measurements show that the compound presents a transition temperature below 15 K and a high coercivity, around 6.3 kOe at 4.2 K. At room temperature, the Moùssbauer spectrum is dominated by a broad doublet characteristic of Fe(II), and a small fraction of Fe(III) ions is also identified. At 4.2 K, the spectrum shows clear magnetic splitting.
Access: L
Appears in Collections:Artigo de periódico

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