Magnetic properties of spinel-type oxides nimn2-xme xo4

• O. PEÑA ^[3] ; C. MOURE ^[1] ; V. BODENEZ ^[3] ; X. CAILLEAUX ^[3] ; B. PIRIOU ^[3] ; J. ORTIZ ^[4] ; G. ZÚÑIGA ^[4] ; J.L. GAUTIER ^[4] ; P.N. LISBOA-FILHO ^[2]
  1. [1] Instituto de Cerámica y Vidrio

     Instituto de Cerámica y Vidrio

     Madrid, España

     
  2. [2] Universidade Estadual Paulista

     Universidade Estadual Paulista

     Brasil

     
  3. [3] Université de Rennes 1 Institut de Chimie de Rennes
  4. [4] Universidad de Santiago Facultad de Química y Biología Dpto. de Química de Materiales

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• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 50, Nº. 3, 2005, págs. 617-623
• Idioma: inglés
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• Resumen

  • New materials, based on the well-known spinel compound NiMn2O4, have been synthesized and characterized from the magnetic point of view. The manganese cation was partially substituted in the general formula NiMn2-xMe xO4 , by nonmagnetic and magnetic elements, such as Me = Ga, Zn, Ni and Cr (0 x 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 Tc stabilized at 110 K, and well defined long-range antiferromagnetic interactions at lower temperatures, which depend on the applied field and the substitute concentration