Bioinfo Publications 61 SYNTHESIS OF NANOSIZED FERRITE FROM THE THERMOLYSIS OF DIPHENYLAMINE SUB-

Abstract- Magnetic nanoparticles have attracted paramount interest in past few years not only because of their application in magnetic re-cording, information storing, data processing devices and magnetic resonance imaging and drug delivery systems but also in fundamental physics. At present study thermal analysis of diphenylamine substituted pentacyanoferrate (II), Na3[Fe(CN)5L] xH2O where L = diphenyla-mine complexes has been carried out in flowing air atmosphere from ambient temperature to 900 oC. Various physicochemical techniques i.e. TGA-DTG, IR, XRD and M ssbauer spectroscopy have been carried out to characterize the intermediate and end products and nanostructured materials. M ssbauer spectra of these complexes exhibits quadrupole doublet with (ΔEQ) = 0.74 mms-1 at room tempera-ture and isomer shift (δ) = 0.00±0.03 mms-1 suggests that the iron atom is in the =+2 low spin state. Thermogram of diphenylamine substi-tuted complexes show multistage decomposition. The complexes stat decomposing at 50oC yielding residual weight 17.9 % at temperature 890 oC. The M ssbauer spectra recorded after heating at 300oC exhibit single line suggesting partial decomposition. At 400 and 500 oC, six lines pattern start appearing which on further heating at 600, 700 and 950 oC turns into three sextect suggesting the formation of mixture Fe3O4(A), Fe3O4(B), Fe3C and-Fe2O3. The temperature of ferrite formation is much lower than possible in the conventional ceramic method