期刊
JOURNAL OF SAUDI CHEMICAL SOCIETY
卷 21, 期 8, 页码 899-910出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jscs.2015.12.006
关键词
Sol-gel auto-combustion; Magnesium ferrite; X-ray diffraction; SEM; Mossbauer spectroscopy; Impedance spectroscopy
资金
- Higher Education Commission (HEC), Pakistan
Crystalline magnesium ferrite (MgFe2O4) spinel oxide powder was synthesized by nitrate citrate sol gel auto-combustion process with stoichiometric composition of metal nitrate salts, urea and citric acid. The study was focused on the modification of synthesis conditions and effect of these modified conditions on the structural and electrical properties of synthesized MgFe2O4 ceramic materials. Phase composition, crystallinity, structure and surface morphology were studied by X-ray diffraction, FTIR and SEM. Pure single phase MgFe2O4 spinel ferrite was obtained after calcination at 850 degrees C. Rietveld refinement of XRD result confirmed the single cubic phase spinel oxide with the lattice constant of a = 8.3931 angstrom and Fd3m symmetry. UV-visible absorption study of calcined powder revealed an optical band gap of 2.17 eV. SEM images of sintered specimens (1050-1450 degrees C) showed that the grain size increased with the increase in sintering temperature. From the impedance results of the sintered MgFe2O4 specimens, it was found that the resistance of grain, grain boundary and electrode effect decreased with an increase in sintering temperature and associated grain growth. In the intermediate frequency region lowering of impedance and dielectric values was observed due to the decrease in grain boundary areas. Mossbauer studies indicated that magnesium ferrite had a mixed spinel structure in calcined and sintered samples, however, the well refined single phase MgFe2O4 was observed due to well developed high crystalline structure at 1350 degrees C and 1450 degrees C. (C) 2016 King Saud University. Production and hosting by Elsevier B.V.
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