<span style="mso-bidi-font-weight:bold" lang="EN-GB">Synthesis of Mg_0.3Zn_0.7Fe₂O₄<span style="mso-bidi-font-weight:bold"> nanoparticles from thermolysis of magnesium zinc tris(maleato)ferrate(III) heptahydrate </span></span>

Abstract

<span style="mso-ansi-language:EN-IN">Mg_0.3Zn_0.7Fe₂O₄<span style="mso-bidi-font-weight:bold"> nanoparticles are synthesized from the thermolysis of precursor magnesium zinc tris(maleato)ferrate heptahydrate&nbsp;MgZn₂[Fe(C₄H₂O₄)₃]₂7H₂O. Thermal decomposition, structural and morphological characterization is studied with simultaneous thermal analysis (STA- viz. TG-DTG-DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and Mössbauer spectroscopy. Dehydration of the precursor completed in two steps followed by decomposition reactions to yield unstable zinc and magnesium oxalates; and metastable ferrous oxalate as intermediates, which further decomposed exothermally into MgO, ZnO and α-Fe₂O₃. Solid state reaction between oxide phases formed spinel ferrite Mg_0.3Zn_0.7Fe₂O₄ as final product at 460°C. Presence of superparamagnetism at room temperature in the final thermolysis product is confirmed by Mössbauer spectrum. Ferrite powder is observed with SEM to be mono dispersed and nano sized with average diameter of 45 nm.

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