Ferrite is a class of magnetic material. Naturally occurring ferrite is the ferrous ferrite(Fe3O4) as "Load Stone". In early days it was considered as ferromagnetic material. But latter on L Neel realized that, material consists uncompensated anti parallel spin arrangement and hence named as "Ferrimagnetic material. Ferrite is a special class of Ferrimagnetic material having interesting intrinsic properties. Basically Farous ferrite Fe3o4 is having double oxides Feo and Fe2O4. The properties can be alter by substituting divalent iron ion by divalent cations from transition elements. Properties can be significantly modified by substituting trivalent iron ion by another trivalent cations. Ferrites are found to be technologically and commercially useful magnetic material. Due to highly electrically resistive and low magnetic behavior as well as negative temperature coefficient of resistance along with low magnetic loss ferrites can be used at high frequencies. They find applications in the fields like elecommunications, electronic industries, data storage and processing. Aluminum substituted Copper Cobalt mixed CuxCo1-xAl2yFe2-2y ferrite system is prepared to study various properties.
The reduction of anthropogenic CO2 emissions is an urgent challenge, and strategies must be adopted to improve the efficiency of CO2 capture and to reduce the costs of this technique. The conversion of carbon dioxide into valuable commodity chemicals has the advantage of avoiding the energy penalties of absorbent regeneration, CO2 compression and its disposal underground. The CO2 capture by NH3 solution either in non-aqueous solvents or in water-ethanol solutions occurs with high efficiency and load capacity affording pure ammonium carbamate in the solid state and, respectively, solid mixtures of ammonium carbamate and bicarbonate. Both ammonium salts can be converted into urea at 120-165 °C without any external pressure with a high yield. An analogous technique is employed to capture CO2 with non-aqueous solutions of some amines and to convert the amine carbamates into 1,3-substituted ureas with a 100% selectivity. The 13C NMR spectroscopy is employed to quantify the species in solution and to identify the compounds in the solid state.