Cation distribution and magnetic property of Ti/Sn-substituted manganese–zinc ferrites.

Manganese–zinc ferrites with the composition of Mn 0.782− x Zn 0.128 M x 4+ Fe 2+ 0.09+2 x Fe 3+ 2−2 x O 4 ( x = 0; M = Ti, x = 0.004; M = Sn, x = 0.004) have been prepared by a solid-state reaction method. The cation distribution has been investigated by the Rietveld refinement of X-ray diffraction (XRD) patterns, fracture microstructure by scanning electron microscope (SEM), and magnetic property by LCR and B–H analyzer, respectively. The results show that Ti 4+ and Sn 4+ ions prefer to occupy octahedron sublattices (B sites), which leads to an increase in lattice parameter. Sn 4+ ions substituted MnZn ferrite has much denser and more uniform microstructure with smaller grains than that of Ti 4+ ions substituted and unsubstituted MnZn ferrites. The Curie temperature ( T c ) of Ti 4+ and Sn 4+ substituted MnZn ferrites is higher than that of unsubstituted sample. In addition, both Ti 4+ and Sn 4+ substitutions, due to the compensation of magnetocrystalline anisotropy constant, can move the secondary peak of μ i ∼ T curve to low temperature. However, the opposite variation trend has been observed in a P L ∼ T curve. Also, the DC-bias superposition characteristics have been discussed. [ABSTRACT FROM AUTHOR]