[en] Full text: In water cooled nuclear reactors the metal oxide present on structural materials serve as protective layer between the metal and the coolant and minimizes corrosion release. The modification of the nature of the metal oxide due to O₂ ingress, noble metal addition and zinc ion addition (for metal ion passivation) strongly influence the corrosion product and activity transport and protectivity of the film. The addition of small quantity of Cr to structural material carbon steel protects the metal from flow accelerated corrosion in bends and elbows. The metal oxide layer is essentially magnetite in simple carbon steel case and is substituted ferrites in multi-metal alloy system. The oxide layer shows variation in their protectivity based on the procedure adopted (for chemistry conditioning) for the development of the film. The metal ions released to solution due to corrosion in reactor circuits supersaturates and precipitates as oxides on system surfaces initially as smaller crystallites which grow with time. In order to understand the characteristic property of these oxides as a function of the different conditions prevailing in the reactor coolant, several synthetic oxides were synthesized. Several procedures were adapted for effecting such synthesis of ferrites in both powder form and as films. Their properties were studied. Nanoferrite particulates were synthesized by polymer combustion route and micro emulsion route and characterised by XRD, Moessbauer and Raman spectroscopy studies to understand the behaviour of particulates in the nanodomain.The cation distribution in the octahedral and tetrahedral sites of spinel lattice is influenced by the nature of the metal ions, temperature and particles size. This in turn influences the electron hopping between the metal ions which affects the metal oxide properties. Experimental studies to develop nanoferrite coating on structural material carbon steel by adding varying concentration of Glycerol, Polyethylene glycol etc in alkaline condition were carried out. These coated specimens were characterised by Impedance spectroscopy and PDAP studies. The size and morphology of the crystallites were characterised by SEM. Raman mapping and spectral studies were carried out to know the film homogeneity and phase characterisation