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Phase Transformation from α-Fe2O3 to Fe3O4 and LiFeO2 by self-reduction of Fe (III) in Prussian Red in the presence of Alkali Hydroxides: Investigation on the Phase dependent Morphological and Magnetic properties

Abstract

A facile, surfactant and calcination free phase transformation from hematite (α-Fe2O3) to magnetite (Fe3O4) and lithium ferrite (LiFeO2) were achieved by self-reduction of Fe3+ ion in [Fe(CN)6]3- anions in the presence of alkali hydroxides (LiOH.H2O, NaOH and KOH) under hydrothermal conditions. It was noted that the CN- ion played a major role in the reduction of Fe3+ into Fe2+. Here, Alkali hydroxides acted as a reduction catalysts as well as a structure directing agent. The hematite, magnetite and lithium ferrite exhibits the different morphologies like dendrites, hexagonal disc, hexagonal ring, truncated sphere, irregular particles, irregular sphere and assorted structures. The detailed reaction mechanism of different phases and the growth mechanism of different shapes have been investigated. The phase dependent magnetic properties have been explained based on the presence of Fe2+ ion in the iron oxide crystal system.

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Publication details

The article was received on 21 Jul 2017, accepted on 15 Sep 2017 and first published on 15 Sep 2017


Article type: Paper
DOI: 10.1039/C7CE01342F
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Phase Transformation from α-Fe2O3 to Fe3O4 and LiFeO2 by self-reduction of Fe (III) in Prussian Red in the presence of Alkali Hydroxides: Investigation on the Phase dependent Morphological and Magnetic properties

    K. P. Thiruppathi and N. Devaraj, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01342F

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