Title of article :
ALaMnBO6 (A = Ca, Sr, Ba; B = Fe, Ru) double perovskites
Author/Authors :
Ramesha، نويسنده , , K. and Thangadurai، نويسنده , , V. and Sutar، نويسنده , , D. and Subramanyam، نويسنده , , S.V. and Subbanna، نويسنده , , G.N. and Gopalakrishnan، نويسنده , , J.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2000
Abstract :
We report the synthesis and investigation of electrical and magnetic properties of double perovskites of the formula ALaMnBO6 for A = Ca, Sr, Ba and B = Fe, Ru. Powder X-ray diffraction (XRD) shows formation of cubic/pseudocubic perovskite structure for all the phases, with no obvious long-range ordering of B-site cations. Electron diffraction, however, reveals an ordering of Mn and Ru in ALaMnRuO6, showing a doubling of the primitive cubic perovskite cell. While the B = Fe phases are paramagnetic insulators, the B = Ru phases are ferrimagnetic semiconductors. It is likely that in the B = Ru phases, a valence equilibrium exists between MnIII/RuIV and MnII/RuV states that is biased toward the latter.
Keywords :
D. Electrical properties , D. Magnetic properties , A. Oxides , B. Chemical synthesis , C. X-ray diffraction
Journal title :
Materials Research Bulletin
Journal title :
Materials Research Bulletin
