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Soft synthesis route and characterization of superparamagnetic Mn 1/2Fe1/2(H2PO4)22H 2O and its decomposed product
Date Issued
February 16, 2011
Type
Article
Abstract
The superparamagnetic Mn1/2Fe1/2(H2PO 4)22H2O was synthesized by a soft synthesis method using a Mn(c)-Fe(c)-H3PO4 system in water-acetone medium at ambient temperature. The synthesized Mn1/2Fe 1/2(H2PO4)2 2H2O decomposed through the dehydration and the phosphate condensation reactions at high temperature and yielded binary manganese iron cyclotetraphosphate MnFeP4O12. The XRD and FTIR results of the synthesized Mn1/2Fe1/2(H2PO4)22H 2O and the decomposed MnFeP4O12 indicate the pure monoclinic phase with space group P21/n and C2/c, respectively. The thermal behaviors and superparamagnetic properties of Mn 1/2Fe1/2(H2PO4)22H 2O and MnFeP4O12 in this work differed from the single compounds (M(H2PO4)22H2O and M2P4O12, where M = Mn, Fe) and the binary compounds (Mn0.5Fe0.5(H2PO4) 2xH2O) reported in previous works. The kinetic and thermodynamic functions for thermal decomposition of Mn1/2Fe 1/2(H2PO4)22H2O were studied and confirmed as reaction mechanisms. Vibrational frequencies of breaking bonds in two thermal transformation stages were estimated and assigned by comparison with the observed FTIR spectra. © 2011 American Chemical Society.
Citation
Industrial and Engineering Chemistry Research, 50(4), 2021-2030, 2011