期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 475, 期 1-2, 页码 832-839出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2008.08.034
关键词
MgO; Al2O3-doping; CdFe2O4; calcination temperature; Activation energy
The solid-state reaction between pure and alumina or magnesia doped Cd/Fe mixed oxides have been investigated using DSC, XRD, IR, TEM and VSM techniques. Equimolar proportions of cadmium nitrate and alpha-Fe2O3 were employed and also Al and Mg were added as aluminum and magnesium nitrates. Pure and doped mixed solid were subjected to thermal treatment at 500-1200 degrees C. The results obtained showed that the degree of propagation of the reaction between Fe2O3 and CdO yielding CdFe2O4 increased as a function of calcination temperature up to 1000 degrees C. However, heating of pure mixed solids at 1000 degrees C for 3 h was sufficient to effect complete conversion of the reacting solids to Cd-ferrite. The crystallite size of produced CdFe2O4 was reduced nanocrystalline range due to Al2O3 or MgO-doping. The microstructure and magnetic properties of the investigated solids were strongly dependent on the calcination temperature and doping process. The maximum saturation magnetization (7.79 emu/g) was achieved by doping with 2 mol% MgO at 1100 degrees C. The formation activation energy of CdFe2O4 was evaluated be 72, 64 and 27 kJ mol(-1) for pure mixed solids and those doped with 6 mol% Al2O3 and 6 mol% MgO, respectively. (C) 2008 Elsevier B.V. All rights reserved.
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