Journal
MATERIALS RESEARCH BULLETIN
Volume 42, Issue 1, Pages 159-164Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2006.04.038
Keywords
layered compounds; oxides; chemical synthesis
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Well-crystallized bimessite sheets containing K+ in the interlayers have been prepared using KMnO4, ethylene glycol and KOH by microwave heating at 90 degrees C for 10 min. Ethylene glycol was used as a reducing agent. The effect of KOH concentration on the formation of birnessite was studied. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TG), differential scanning calorimetric analysis (DSC) and Fourier transform infrared (FTIR). Birnessites were converted to cryptomelane upon heating at 400-800 degrees C and completely collapsed to form Mn3O4 at 1000 degrees C. (C) 2006 Elsevier Ltd. All rights reserved.
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