Gonen, ZS and Gopalakrishnan, J and Eichhorn, BW (2002) Ferrimagnetism and metal-insulator transitions in the LaMnxRu1-xO3 perovskites. In: Solid State Sciences, 4 (6). pp. 773-778.
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: 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 greater than or equal to 0.50 exhibit a short-range ferro/ferrimagnetic order below 150 K that is likely due to Mn-III/VI-O-Ru-III (ferrimagnetic) and Mn-III-O-Mn-VI (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 less than or equal to 0.05.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Keywords:||Defect Structure;Magnetic Order;Lamno3+Delta;Magnetoresistance;Sr; Ba;Ca.|
|Department/Centre:||Division of Chemical Sciences > Solid State & Structural Chemistry Unit|
|Date Deposited:||21 Jul 2009 10:13|
|Last Modified:||19 Sep 2010 05:01|
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