Abstract
Use of in situ combined x-ray diffraction and x-ray absorption spectroscopy for the study of the thermal decomposition of zinc peroxide to zinc oxide is reported here. Comparison of data extracted from both x-ray diffraction (XRD) and x-ray absorption spectroscopy (XAS) with thermo gravimetric analysis (TGA) enabled us to follow the nature of the conversion of ZnO2 to ZnO. A temperature range between 230 °C and 350 °C appears to show that a very poorly crystalline ZnO is formed prior to the formation of an ordered ZnO material. Both the decrease in white line intensity in the Zn K-edge XANES and resulting lower coordination numbers estimated from analysis of the Zn K-edge data of ZnO heated at 500 °C, in comparison to bulk ZnO, suggest that the ZnO produced by this method has significant defects in the system.
Highlights
Introduction cri ptZinc oxide is a multi-functional material that has found a plethora of applications, due to its electronic and structural properties
Nano sized ZnO materials have been synthesised in a variety of ways including an hydrothermal[13], mechanochemical[14], spray pyrolysis[15], chemical bath techniques etc[11, In addition to the above, ZnO can be conveniently prepared using a two-stage approach by first making zinc peroxide (ZnO2) and subsequently decomposing this in a controlled way to produce zinc oxide, the method of our choice reported in this work
A thermo gravimetric analysis (TGA) plot is shown in Figure 2, wherein it is clear that the weight loss starts to occur gradually just below 200oC
Summary
Introduction cri ptZinc oxide is a multi-functional material that has found a plethora of applications, due to its electronic and structural properties. The decomposition of ZnO2 was investigated through monitoring the long-range and local cri pt structural changes during the heat treatment of ZnO2, employing in situ combined XRD/XAS
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