The BaLaCuSbO(6) double perovskite has been successfully synthesized by solid state reaction under an air atmosphere. Its structure was refined using powder neutron diffraction in the monoclinic space group I2/m with a 4% antisite disorder on the B cations. Magnetic measurements give signs of 2D-antiferromagnetic behaviour with TN around 64 K. The Jahn-Teller distortion produced by Cu(2+) ions favours a crystallographic tetragonal distortion and consequently the in-plane super-superexchange antiferromagnetic interactions, J(90°), are favoured over the in-plane J(180°) antiferromagnetic exchange interactions. Both, J and J' magnetic interactions have been evaluated according to a Heisenberg antiferromagnetic rectangular model using an approximation to Curie's law in powers of J/T, being |J| around 10 times stronger than |J'|.
in air (alumina crucible, 1. 780 C, 12 h, 2. 900 C, 10 h, 3. 1250 C (for Ni and Co perovskites) and 1350 C for Mn perovskites, 24 h). (I) and (III) belong to the monoclinic space group I2/m, while (II) crystallizes in the tetragonal space group I4/m. (II) and (III) show the expected 3D-antiferromagnetic behavior typical for super-superexchange interactions, while (I) displays signs of superparamagnetism in the 40-160 K range which is attributed to unbalanced antiferromagnetism inside nanoclusters formed by regions rich in Mn 2+ -O 2--Mn 2+ paths. Neutron powder diffraction data for (I) reveal that long range order antiferromagnetic arrangement of Mn 2+ spins on 2d octahedral sites occurs only at 3 K. -(BLANCO, M. C.; DE PAOLI, J. M.; CEPPI, S.; TIRAO, G.; NASSIF, V. M.; GUIMPEL, J.; CARBONIO*, R. E.; J. Alloys Compd. 606 (2014) 139-148, http://dx.doi.org/10.1016/j.jallcom.2014.04.013 ; Dep. Fis. Quim., Fac. Cienc. Quim., Univ. Nac. Cordoba, 5016 Cordoba, Argent.; Eng.) -J. Schramke 31-008
Reddish‐black polycrystalline powder of the title compound is prepared by solid state reaction of a stoichiometric mixture of La2O3, Co3O4, and Sb2O3 (950 °C for 12 h and 1400 °C for 12 h).
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