TY - JOUR
T1 - ALaMnBO6 (A = Ca, Sr, Ba; B = Fe, Ru) double perovskites
AU - Ramesha, K.
AU - Thangadurai, V.
AU - Sutar, D.
AU - Subramanyam, S. V.
AU - Subbanna, G. N.
AU - Gopalakrishnan, J.
PY - 2000/3/1
Y1 - 2000/3/1
N2 - 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.
AB - 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.
U2 - 10.1016/S0025-5408(00)00248-8
DO - 10.1016/S0025-5408(00)00248-8
M3 - Article
AN - SCOPUS:0034156504
SN - 0025-5408
VL - 35
SP - 559
EP - 565
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 4
ER -