Ferrimagnetism and metal-insulator transitions in the LaMnxRu1-xO3 perovskites

Serpil Gonen, Z. ; Gopalakrishnan, J. ; Eichhorn, B. W. (2002) Ferrimagnetism and metal-insulator transitions in the LaMnxRu1-xO3 perovskites Solid State Sciences, 4 (6). pp. 773-778. ISSN 1293-2558

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S12932...

Related URL: http://dx.doi.org/10.1016/S1293-2558(02)01286-4


We describe the synthesis, structure, magnetic and electrical properties of solid solutions of nominal composition, LaMnxRu1-xO3 (0<x<1). All the members crystallize in the GdFeO3-perovskite structure where Mn/Ru are randomly distributed at the octahedral sites. Weight losses due to hydrogen reduction, recorded using thermogravimetry, suggest considerable nonstoichiometry arising from partial oxidation of Mn/Ru to the tetravalent state. The nonstoichiometry is most likely accommodated by creating vacancies both at A and B sites of the perovskite structure, just as it occurs in LaMnO3+y. Members with x ≥0.50 exhibit a short-range ferro/ferrimagnetic order below 150 K that is likely due to MnIII/VI---O---RuIII (ferrimagnetic) and MnIII---O---MnVI (ferromagnetic) interactions in the perovskite structure. All the members are semiconducting including the x=0.05 member, suggesting that a metal-insulator transition occurs in the LaMnxRu1-xO3 system for x ≤0.05.

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Deposited On:10 Nov 2010 06:33
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