Synthesis of lithium ferrites from polymetallic carboxylates

• Main Authors: Gingasu Dana, Mindru Ioana, Patron Luminita, Stoleriu Stefania
• Format: Article
• Language: English
• Published: Serbian Chemical Society 2008-01-01
• Series: Journal of the Serbian Chemical Society
• Subjects: lithium ferrite; chemical synthesis; thermogravimetric analysis (tga); x-ray diffraction; magnetic properties
• Online Access: http://www.doiserbia.nb.rs/img/doi/0352-5139/2008/0352-51390810979G.pdf

Lithium ferrite was prepared by the thermal decomposition of three polynuclear complex compounds containing as ligands the anions of malic, tartaric and gluconic acid: (NH4)2[Fe2.5Li0.5(C4H4O5)3(OH)4(H2O)2]×4H2O (I), (NH4)6[Fe2.5Li0.5(C4H4O6)3(OH)8]×2H2O (II) and (NH4)2[Fe2.5Li0.5(C6H11O7)3(OH)7] (III). The polynuclear complex precursors were characterized by chemical analysis, IR and UV-Vis spectra, magnetic measurements and thermal analysis. The obtained lithium ferrites were characterized by XRD, scanning electron microscopy, IR spectra and magnetic measurements. The single a-Li0.5Fe2.5O4 phase was obtained by thermal decomposition of the tartarate complex annealed at 700°C for 1 h. The magnetization value ≈ 50 emu g-1 is lower than that obtained for the bulk lithium ferrite due to the nanostructural character of the ferrite. The particle size was smaller than 100 nm.