Pena, O.Moure, C.Bodenez, V.Cailleaux, X.Piriou, B.Ortiz, J.Zúñiga, G.Gautier, J. L.Lisboa Filho, Paulo Noronha [UNESP]2014-05-272014-05-272005-09-01Journal of the Chilean Chemical Society, v. 50, n. 3, p. 169-181, 2005.0717-9324http://hdl.handle.net/11449/68402New materials, based on the well-known spinel compound NiMn 2O4, have been synthesized and characterized from the magnetic point of view. The manganese cation was partially substituted in the general formula NiMn2-xMexO4, by nonmagnetic and magnetic elements, such as Me = Ga, Zn, Ni and Cr (0 × 1). Prior to the determination of their magnetic properties, the non-substituted spinel NiMn2O4 was carefully characterized and studied as a function of the oxygen stoichiometry, based on the influence of the annealing atmosphere and quenching rate. The ferrimagnetic character was observed in all samples, with a paramagnetic-to-ferromagnetic transition temperature T c stabilized at 110 K, and well defined long-range antiferromagnetic interactions at lower temperatures, which depend on the applied field and the substitute concentration. © 2006 Sociedad Chilena de Química.169-181engFerrimagnetic propertiesMagnetic exchangeMagnetic oxidesSpinelsArtigo10.4067/S0717-97072005000300016S0717-97072005000300016WOS:000232185900016Acesso restrito2-s2.0-3154443960313538624145320050000-0002-7734-4069