Abstract
The polycrystalline Li0.499−0.5xZnxCo0.002Mn0.06Fe2.439−0.5xO4 (x = 0.1–0.4) ferrites have been fabricated by solid-state method. According to the Brillouin function for ferrites, the temperature characteristics of magnetization of LiZnMn ferrites have been investigated by nonlinear fitting method. For the spinel structure consisted of tetrahedral A sub-lattice and antiparallel octahedral B sub-lattice simultaneously occupied by multiple magnetic ions (Co2+, Mn3+, and Fe3+), respectively, based on the two-sublattice molecular-field theory, the intra-sublattice molecular-field coefficients λAA, λBB, and the inter-sublattice molecular-field coefficients λAB = λBA have been calculated. Furthermore, both ferrimagnetism and paramagnetism thermomagnetic characteristics have been investigated. In addition, the Curie temperature Tc calculation formula for ferrimagnetism and paramagnetism have been modified, respectively. The results show that the calculated values are well coincided with the experiment results. Along with increasing of the zinc content, the absolute value of λBB increases constantly, however, these of λAA and λAB = λBA show an opposite trend, meanwhile, the strength of superexchange interaction mainly depends on λAB = λBA.
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