A(2)MnB'O-6 (A = Ca, Sr; B = Sb, Ta) double perovskites have been synthesized and their structural and magnetic properties have been investigated. Rietveld refinement of the powder X-ray diffraction data for Sr2MnSbO6 indicated significant ordering of Mn and Sb at the B-site while all other phases showed mostly a random distribution of the B-site cations. X-ray absorption spectroscopic data established the presence of Mn in the 3+ and Sb/Ta in the 5+ oxidation states in all the phases. Magnetic susceptibility data indicated ferromagnetic correlations for all the A(2)MnB'O-6 phases with Weiss temperatures varying from 64 to 107 K. (C) 2008 Elsevier Inc. All rights reserved.
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Comis Nacl Energia Atom, RA-1650 San Martin, Argentina
Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, RA-1428 Buenos Aires, DF, ArgentinaComis Nacl Energia Atom, RA-1650 San Martin, Argentina
Ignacio Melo, Juan
Weht, Ruben
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Comis Nacl Energia Atom, RA-1650 San Martin, Argentina
Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, RA-1428 Buenos Aires, DF, ArgentinaComis Nacl Energia Atom, RA-1650 San Martin, Argentina
Ignacio Melo, Juan
Weht, Ruben
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Comis Nacl Energia Atom, RA-1650 San Martin, ArgentinaComis Nacl Energia Atom, RA-1650 San Martin, Argentina