Elucidation of atomic and magnetic structures of Al3+-doped Li-ferrite (LiFe5O8) compounds

Chemical stress for structural deformation in , denoted as Li60Al40, and , denoted as Li50Al50, was achieved by introducing into α- known as a high-temperature multiferroic. These new solid solution compounds crystallize in the tetragonal space group P43212. Their magnetic spin arrangements at 300K could be determined in the magnetic space group P4321 P4321'2' using high-resolution neutron powder diffraction (HRNPD) data. Within the experimental uncertainty in HRNPD, the magnetic moments of ions within in the B-sublattice are arranged along the crystallographic c axis and antiparallel to those of in the A-sublattice. In comparison to the Fe-rich Li60Al40, the Fe-poor Li50Al50 shows a stronger dilute effect for the higher Li content at the octahedral site Fe1b. The dilute effect is associated with the lowering of both saturation magnetization and TC. On the other hand, Li50Al50 shows large electric dipole moments in the strong distorted and polyhedra.