Journal
JOURNAL OF SAUDI CHEMICAL SOCIETY
Volume 21, Issue 7, Pages 830-836Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jscs.2017.03.008
Keywords
Tetragonal Mn3O4; Monoclinic Mn5O8; Cubic Mn2O3; Structural transition; Nanorod
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Funding
- CASR of Bangladesh University of Engineering and Technology (BUET)
- University Grants Commission (UGC) of Bangladesh
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Mn3O4 nanoparticles (NPs) were synthesized from the reduction of KMnO4 with glycerol at 80 degrees C in aqueous media via a gel formation route. In order to investigate the thermal stability and phase transformation, Mn3O4 NPs were subjected to heat treatment from 200 degrees C to 700 degrees C. The formation of different MnOx species observed by X-ray diffraction (XRD) measurements showed temperature dependent phase transformation occurring during the heat treatment process. XRD patterns showed that Mn3O4 NPs were formed at a temperature of 80 degrees C and two new phases Mn5O8 and Mn2O3 were appeared at 350 degrees C and 700 degrees C respectively. The three different oxides having their distinct surface morphologies viz., spherical, rod and cube shape respectively, were observed. Detailed morphological and structural investigations using Field Emission Scanning Electron Microscopy (FESEM), XRD, Thermo Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) revealed the temperature dependent phases, crystal structures, lattice constants, particle sizes and surface morphologies of the MnOx species. (C) 2017 King Saud University. Production and hosting by Elsevier B.V.
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