Comparative studies of synthesis of nanosized ferrite from the thermolysis of di-and tri-phenylamine substituted pentacyanoferrate complexes

Ferrite material has been under intense research for so long due to their useful electromagnetic characteristics for large number of applications. Magnetic nanoparticles have attracted paramount interest in past few years not only because of their application in magnetic recording, information storing, data processing devices and magnetic resonance imaging and drug delivery systems but also in fundamental physics. At present study thermal analysis of di and triphenylamine substituted pentacyanoferrate (II), Na3[Fe(CN)5L] xH2O where L= di and triphenylamine 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 Mössbauer spectroscopy have been carried out to characterize the intermediate, end products and nanostructured materials. Mössbauer spectra of these complexes exhibits quadrupole doublet with (ΔEQ) = 0.69-0.71 mms-1 at room temperature and isomer shift (δ) = 0.01±0.03 mms-1 suggests that the iron atom is in the = +2 low spin state. Thermogram of di and diphenylamine substituted complexes show multistage decomposition. The complexes start decomposing at 50oC yielding residual weight 21.6 and 18.9 % at temperature ~985 + 5 oC. The Mössbauer spectra recorded after heating at 300oC exhibit single line suggesting partial decomposition. At 500 and 750 oC, six lines pattern start appearing which on further heating at 950 oC turns into four sextet suggesting the formation of mixture Fe3O4(A), Fe3O4(B), Fe3C and α-Fe2O3. The temperature of ferrite formation is much lower than possible in the conventional ceramic method

Author(s): Ratnakar B. Lanjewar1 and Mamata R. Lanjewar2

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