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Neutron diffraction studies on metal-organic magnetic solid solution. Searching for the tunable magnetic material

AutorDíaz-Gallifa, Pau; Fabelo, Óscar; Pasán, Jorge; Cañadillas-Delgado, Laura; Ruiz-Pérez, Catalina
Palabras claveμ Mi
Fecha de publicación2013
CitaciónMISSCA 2013
ResumenThe understanding of the magnetic interaction mechanisms among the crystal network metallic ions has been object of several studies during the last decades. The X-ray diffraction and the susceptibility measurements are the most extended techniques for structural and magnetic materials characterization however for an accurate micro-magnetic strucre description the most powerful tool is magnetic crystallography. Nevertheless neutron diffraction under metalorganic compounds is not really extended among the magneto-chemistry community. The synthesis, the crystal structure, the magnetic susceptibility and Neutron diffraction studies of two heteronuclear 3d-3d solid solutions are here presented. The three-dimensional coordination polymer, [(Co1-x Mx)2(bta)]n[H4bta = 1,2,4,5-benzenetetracarboxylic acid, with M = Fe(II) for compound (I) and Mn(II) for compound (2) and x= 0, 0.25, 0.5, 0.75, 1] has been synthetized through hydrothermal conditions. The crystal structure and, particularly the magnetic properties of the pure Co(II) complex have been widely discussed in the literature. The crystal structure of [Co2(bta)n', [Fe2(bta)n', and [Mn2(bta)]n is the same and crystallizes in the monoclinic C 2/m space group with a cell-volume of 440 ºA and Z = 4. The pyromellitate ligand exhibits 12 coordination bonds towards 10 metal ions, and it consists of M(II) μ-oxo and carboxylate bridged layers linked through the carbon skeleton of the bta ligand (pillared-layer network).The doped ratio concentrations for compound 1 and 2 have been determined by neutron diffraction (bco, = 0.25.10-12 cm, bFe = 0.96.10-12'' cm, and bMn = -0.37.10-12 cm). We find variations on Neel temperatures as well as relevant changes on neutron diffraction patterns along the whole range of ratio concentrations for compound 1 and 2.
DescripciónResumen del póster presentado al "Meeting of the Italian, Spanish and Swiss Crystallographic Associations" celebrado en Como (Italia) del 9 al 12 de septiembre de 2013.
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