Evaluating the theoretical elastic properties of Li-Mn ferrites: A new approach

The ability to select the most suited ferrite materials for a given application necessitates understanding of their elastic characteristics. In the present communication, the elastic properties of Li-Mn-Co, Li-Mn-Ni and Li-Mn-Cu ferrite series were evaluated and predicted in terms of compositional parameters, for the first time. This has been carried out on the basis of Makishima-Mackenzie's theory, Rocherulle et al. model as well as Abd El-Moneim and Alfifi's approach. The compositional factors that are most important were assessed and correlated with experimental elastic properties. Moreover, the theoretically calculated values of elastic moduli, micro -hardness, and Poisson's ratio were compared with those determined experimentally from ultrasonic velocities and density measurements. It has been found that Abd El-Moneim and Alfifi's approach can be applied suc-cessfully to predict changes in bulk modulus of the investigated ferrite series. The calculated packing densities from Makishima-Mackenzie's theory and Rocherulle et al. model are suitable for predicting the data of experi-mental Poisson's ratio. A reasonable agreement between theoretical and experimental data of elastic moduli, and micro-hardness was achieved on the basis of Makishima-Mackenzie's theory.

Automated summary

The elastic properties of Li-Mn-Co, Li-Mn-Ni, and Li-Mn-Cu ferrite series were evaluated and predicted for the first time using different theoretical models. The approach by Abd El-Moneim and Alfifi successfully predicted changes in bulk modulus, while the theories by Makishima-Mackenzie and Rocherulle were useful for predicting experimental Poisson's ratio. Reasonable agreement between theoretical and experimental data was achieved for elastic moduli and micro-hardness using Makishima-Mackenzie's theory.