Synthesis, structure and magnetic properties of the new double perovskite Ca2CrSbO6

摘要

The title double perovskite has been synthesized by solid-state reaction in air. The crystal structure has been studied from powder X-ray diffraction data. Rietveld fits to the pattern show that this compound has a monoclinic symmetry [a = 5.4932(3) angstrom, b = 5.4081(3) angstrom, c=7.6901(5) angstrom, beta=90.0022(1)degrees, at 300 K] defined in the space group P2(1), where the Cr and Sb cations are almost completely ordered in the B-sublattice of the perovskite structure. Magnetic susceptibility and magnetization measurements show that this compound behaves as a CurieWeiss paramagnet at high temperatures with mu(eff) = 3.53(1) mu(B) and theta(p) = 8 K, and exhibits a robust ferromagnetic component below the ordering temperature of T-C = 13 K, with a saturation magnetization of 2.36 mu(B)/f.u. at 5 K. To our knowledge, this is the first example of a ferromagnetic double perovskite containing a non-magnetic element, such as Sb, occupying one half of the B positions of the perovskite structure. (c) 2006 Elsevier Ltd. All rights reserved.