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Title: Metal-Insulator Transitions In Anion-Excess Lamno3+δ Controlled By The Mn4+ Content
Authors: Verelst, M
Rangavittal, N
Rao, C N R
Rousset, A
Keywords: Experimental study
Electrical conductivity
Metal insulator transition
Thermal annealing
Chemical composition
Inorganic compound
Manganese Lanthanum Oxides Mixed
Transition metal Compounds
Lanthanide Compounds
Issue Date: May-1993
Publisher: Academic Press Inc
Citation: Journal of Solid State Chemistry 104(1), 74-80 (1993)
Abstract: LaMnO3+δ samples with Mn4+ content up to 50% have been prepared by different methods. The structure of LaMnO3+δ changes from orthorhombic to cubic (via rhombohedral) with increase in the Mn4+ content. LaMnO3+δ samples containing greater than 20% Mn4+ are ferromagnetic and show resistivity maxima at a temperature Tt which is close to the ferromagnetic Curie temperature. The resistivity maximum is due to the occurrence of a metal-insulator transition. In samples heated to the same temperature, the value of Tt increases with % Mn4+. For a given sample, Tt increases with the temperature of heat treatment due to the increase in particle size. The onset of ferromagnetism in LaMnO3+δ accompanied by an insulator-metal transition is similar to that found in La1-xCaxMnO3 and La1-xSrxCoO3.
Description: Restricted Access
Other Identifiers: 0022-4596
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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