Magnetic Structures of Pillared Honeycomb Diferrites K2-x Fe4-y My O7 (M = Si, Ge, Ti, Mn, Ir, Rh)
The new ferrate K2-xFe4O7 (x = 0.3 - 0.5, P-31m) is composed of honeycomb layers of edge sharing [FeO6] octahedra which are interconnected to a three-dimensional framework by [Fe2O7] diferrate units with tetrahedrally coordinated Fe cations. The potassium cations are located in the two-dimensionally linked cavities of the framework. Magnetisation measurements suggest complex antiferromagnetic behaviour of K2-xFe4O7. First powder neutron diffraction data revealed a magnetic structure with c' = 2 c and all moments parallel c (P-31c, T = 300 K). The honeycomb layers are ferromagnetically ordered while the couplings of the tetrahedra are antiferromagnetic. The substitutions K2-xFe4-yMyO7 (M = Si, Ge, Ti, Mn, Ir, Rh) with preferential site occupation (octahedral site: Mn, Ir, Rh; tetrahedral site: Si, Ge, Ti) show drastic differences in magnetic behaviour. Profound investigation of the magnetic structures will lead to deeper insight into correlations between magnetic behaviour and chemical bonding situation of these wide-bandgap semiconducting compounds with potential high ionic conductivity. Therefore, we propose thermal neutron powder diffraction measurements at 300 K and 5 K.
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HUNGER Jens; ALBRECHT Ralf; DOERT Thomas; RUCK Michael and SUARD Emmanuelle. (2018). Magnetic Structures of Pillared Honeycomb Diferrites K2-x Fe4-y My O7 (M = Si, Ge, Ti, Mn, Ir, Rh). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2600
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