J. Phys. IV France 07 (1997) C1-89-C1-90
Preparation of Nickel Ferrite from thermolysis of Nickel Hexa(Formato)-Ferrate(III)HexahydrateB.S. Randhawa and R. Singh
Department of Chemistry, Guru Nanak Dev University Amritsar 143 005, India
Thermal decomposition of nickel hexa(formato) ferrate(III) decahydrate i.e. Ni3[Fe(HCOO)6]2.10H2O has been studied upto 973 K in static air atmosphere employing TG,DTG,DTA,DSC,XRD,ESR, Mössbauer and infrared spectroscopic techniques. Dehydration occurs in two stages in the temperature range of 348-423 K. Immediately after the removal of the last water molecule, the anhydrous complex undergoes decomposition till α-Fe2O3 and nickel carbonate are formed at 588 K. In the final stage of remixing of cations, a solid state reaction between α-Fe2O3, and nickel carbonate leads to the formation of NiFe2O4, at a temperature (873 K) much lower than for ceramic method. A high value of saturation magnetization i.e. 4440 gauss of the ferrite (NiFe2O4) shows its potential to function at high frequencies.
© EDP Sciences 1997