Understanding magnetic behavior of new Sr2Mn2-xSbxO6 (0.05≤х<1) solid solutions with mixed Mn3+/Mn4+ oxidation states
We propose to perform a detailed study of new solid solutions formed between SrMnO3 (Mn4+) and Sr2MnSbO6 (Mn3+). The introduction of a non-magnetic Sb5+ cation on the Mn4+ position of the perovskite structure induces different ordering at B-site cations (Mn3+/Mn4+/Sb5+) leading to interesting magnetic behavior. Our preliminary study revealed the formation of two solid solutions: (1) Sr2Mn2-xSbxO6 (0.05<x<0.18) has a distorted 6H-SrMnO3 structure (sp.gr. C2/c) and an ordered distribution of cations on B-sites; magnetic susceptibility measurements showed a magnetic transition to an antiferromagnetic state at 180 K; (2) Sr2Mn2-xSbxO6 (0.35<x<1) has a tetragonal double perovskite structure (sp. gr. I4/m) with partial ordering of the B-cations in octahedral positions. Magnetic susceptibility measurements showed two transitions: at T = 10-20 K and at 450 K. The aim of the proposed experiment is to reveal details of the crystal structure, to describe the magnetic structures of the two solid solutions and to correlate structural data with magnetic behavior. Neutron diffraction experiments are planned to be carried out at the D2B line at 298 K, liquid helium temperature and at 460 K.
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TARAKINA Nadezda and SUARD Emmanuelle. (2016). Understanding magnetic behavior of new Sr2Mn2-xSbxO6 (0.05≤х<1) solid solutions with mixed Mn3+/Mn4+ oxidation states. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2416
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