This book has given an overview of the sol-gel auto-combustion preparation method and characterization of Ni0.5Co0.5FeAlO4. This work focused on the structural properties XRD,TGA, SEM, TEM, FTIR, Magnetic Properties, Dielectric Properties were measured.By using the TG curve the exact temperature of formation of ferrite phase was obtained.The properties such as dielectric constant, dielectric loss tangent as a function of frequency and temperature. The addition of aluminium results in increasing the resistivity which decreases the dielectric losses and saturation magnetization. Sintering temperature and synthesis rout plays important role in the fabrication of nano-structured ferrite materials. Attempts are made to synthesis the ferrites by changing their sintering temperature and synthesis route in order to study the structural, electrical and magnetic properties. In the present investigation we have prepared the nanocrystalline powder of Ni-Co-Fe-Al-O ferrite and sintered at four different temperature 5000C, 6000C, 7000C and 8000C. Effect of sintering temperature on the structural, electric and magnetic properties of Ni-Co-Fe-Al-O ferrite nanoparticles were studied.
This book has given an overview of the sol-gel auto-combustion preparation method and characterization of Ni0.5Co0.5FeCrO4. This work focused on the structural properties XRD,TGA, SEM, TEM, FTIR, Magnetic Properties, Dielectric Properties were measured.By using the TG curve the exact temperature of formation of ferrite phase was obtained.The properties such as dielectric constant, dielectric loss tangent as a function of frequency and temperature. The addition of chromium in nickel – cobalt ferrite significantly changes the electrical and magnetic properties. Nickel and cobalt ferrites are inverse ferrites and hence for x £ 1, nickel ferrite shows structure of inverse spinel and for x >1, the inverse structure converted into normal structure. The crystal structure of ferrite, cation distribution, synthesis route, sintering conditions, amount and type of impurity addition decides the electric and magnetic properties of ferrites. Same ferrite with different crystalline size shows different properties. The electrical and magnetic properties even structural properties of ferrites at nano-crystalline phase shows significantly difference than the bulk one. In the present investigation we have presented the results on structural and magnetic properties of Ni0.5Co0.5FeCrO4 sintered at 5000C, 6000C, 7000C and 8000C for 6h.
This book brings together the most important advances in the field of recent decades. It provides instructors teaching graduate, postgraduate and researchers level for material science courses with a comprehensive and in-depth textbook, that will prepare post graduate students for research or further study as well as reading more advanced and specialized books and research literature in the field. This textbook covers Introduction to Spinel Ferrites, Materials and Methods, Synthesis of Ferrites, while discussing cutting-edge such as Structural Properties, Magnetic Properties, Electrical Properties, Results and Discussion, Experimental Procedure, Results and Discussion, Conclusions
Ferrites are used in wide range of technological applications like core transformer, recorder heads, memory chips, antenna rod etc. due to their magnetic and electric properties. The crystal structure of these materials controls their physical properties. Ferrites have a very low conductivity, which is one of the considerations for microwave applications. The basic electrical and magnetic properties of the ferrites depend upon method of preparation site and valence distribution etc. Among all the ferrites, copper ferrite is interesting and have many technological applications because copper ferrite shows tetragonal structure , changing semi conductive properties and electrical switching when heat-treated under different conditions. Therefore, the electrical and magnetic properties of copper ferrite can be changed with its structure. Further, the presence of Jahn-Teller ion Cu2+ in copper ferrite can lead to a change in electrical and magnetic properties. The influence of Jahn-Teller ion Cu2+ at the octahedral [B] sites can be modified by trivalent and tetravalent ions. Magnetic dilution due to substitution of non-magnetic atoms gives rise to interesting magnetic structures in compounds with spinel structure.
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