SUBSTITUTION EFFECTS ON THE MAGNETIC PROPERTIES OF NI(ME,MN)2O4 AND LI(ME,MN)2O4: COMPARISON BETWEEN ME = CR AND FE

SUBSTITUTION EFFECTS ON THE MAGNETIC PROPERTIES OF NI(ME,MN)2O4 AND LI(ME,MN)2O4: COMPARISON BETWEEN ME = CR AND FE

Manganese oxides of spinel structure, based on nickel (NiMn2O4) or lithium (LiMn2O4), were studied by magnetic measurements. Manganese was partially substituted by either chromium or iron, showing substantial variations of the magnetic properties with respect to the non-substituted compounds. Chromi...

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Veröffentlicht in:Journal of the Chilean Chemical Society 2005-06, Vol.50 (2), p.495-499
Hauptverfasser: BARAHONA, Patricia, BODENEZ, Vincent, GUIZOUARN, Thierry, PEÑA, Octavio, ORTIZ, Juan, RIOS, Edmundo, PASTENE, Rubén, GAUTIER, Juan Luis
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container_end_page 499
container_issue 2
container_start_page 495
container_title Journal of the Chilean Chemical Society
container_volume 50
creator BARAHONA, Patricia
BODENEZ, Vincent
GUIZOUARN, Thierry
PEÑA, Octavio
ORTIZ, Juan
RIOS, Edmundo
PASTENE, Rubén
GAUTIER, Juan Luis
description Manganese oxides of spinel structure, based on nickel (NiMn2O4) or lithium (LiMn2O4), were studied by magnetic measurements. Manganese was partially substituted by either chromium or iron, showing substantial variations of the magnetic properties with respect to the non-substituted compounds. Chromium enhances the antiferromagnetic interactions in both NiMn2-xCr xO4 and LiMn2-xCr xO4, while iron enhances the ferromagnetic ones, increasing Tc well above room temperature in NiMn2xFe xO4 and LiMn2-xFe xO4 (0 £ x £ 1). Titration analyses allowed us to estimate the Mn n+/Mn n+1 ratios in most cases, confirming the importance of the Mn3+-O-Mn4+ double-exchange ferromagnetism and the controlled-valence conduction mechanism in these materials
doi_str_mv 10.4067/S0717-97072005000200011
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title SUBSTITUTION EFFECTS ON THE MAGNETIC PROPERTIES OF NI(ME,MN)2O4 AND LI(ME,MN)2O4: COMPARISON BETWEEN ME = CR AND FE
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