Comparison Study Of Magnetic Ordering For Fe-Free And Fe-Doped Limn2o4 Spinel Oxide

The structural and physical properties of LiMn2-xFexO4 (x = 0 to 0.5) were investigated. Contrasting LiMn2O4 with LiMn1.5Fe0.5O4, we observed a remarkable difference in the magnetic frustration. The LiMn2O4 sample has a magnetic ordering transition at 61 K while Fe-doped LiMn1.5Fe0.5O4 has an antiferromagnetic ordering transition with a Neel temperature at T-N = 34 K. Our result showed a larger value of the frustration index (f=vertical bar w vertical bar/T-C) for pure LiMn2O4 than for LiMn1.5Fe0.5O4. Fe-doping results in a decrease in the degree of frustration. Fe dopants occupying positions of Mn ion can break the original moment equilibrium so as to suppress the magnetic frustration in LiMn2O4.