Monitoring the process of formation of ZnO from ZnO2 using in situ combined XRD/XAS technique. (31st May 2021)

• Record Type: Journal Article
• Authors: Daley, Thomas; Opuni, Kwasi B; Raj, Edwin; Dent, Andrew J; Cibin, Giannantonio; Hyde, Timothy I; Sankar, Gopinathan
• Is Part Of: Journal of physics. Volume 33:Number 26(2021)
• Publication Date: 2021-05-31
• Subjects: ZnO -- combined XRD/XAS -- in situ -- ZnO2; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/abfb91
• Languages: English
• ISSNs: 0953-8984

Abstract

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.