کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1463354 | 989645 | 2009 | 4 صفحه PDF | دانلود رایگان |
Thermal decomposition of cobalt tris(malonato)ferrate(III)trihydrate precursor, Co3[Fe(CH2C2O4)3]·3H2O has been investigated from ambient temperature to 600 °C in static air atmosphere using various physico-chemical techniques, i.e. TG–DTG–DSC, XRD, Mössbauer and IR spectroscopic techniques. The precursor undergoes dehydration and decomposition simultaneously to yield cobalt malonate and iron(II) malonate intermediates at 205 °C. At higher temperature (325 °C) these intermediate species undergo exothermic decomposition to yield CoO and α-Fe2O3, respectively. Finally cobalt ferrite, CoFe2O4, has been obtained as a result of solid–solid reaction between Fe2O3 and CoO at a temperature (380 °C) much lower than that of ceramic method. SEM analysis of the final thermolysis product reveals the formation of monodisperse cobalt ferrite nano-particles with an average particle size of 45 nm. Magnetic studies show that these particles have a saturation magnetization of 3095 G and Curie temperature of 504 °C. Lower magnitude of these parameters as compared to the bulk values is attributed to the smaller particle size.
Journal: Ceramics International - Volume 35, Issue 8, December 2009, Pages 3521–3524