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Monitoring the process of formation of ZnO from ZnO2 using in situ combined XRD/XAS technique

DOI: 10.1088/1361-648X/abfb91 DOI Help

Authors: Thomas Daley (University College London) , Kwasi Opuni (University College London) , Edwin Raj (Johnson Matthey Plc) , Andrew J. Dent (Diamond Light Source) , Giannantonio Cibin (Diamond Light Source) , Timothy I Hyde (Johnson Matthey Plc) , Gopinathan Sankar (University College London)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter

State: Published (Approved)
Published: April 2021
Diamond Proposal Number(s): 6966

Open Access Open Access

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 and 350oC appears to show a very poorly crystalline ZnO is formed prior to the formation of 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 Zn K-edge data of ZnO heated at 500oC, in comparison to bulk ZnO, suggest that that the ZnO produced by this method has significant defects in the system.

Diamond Keywords: Semiconductors

Subject Areas: Materials, Physics

Instruments: B18-Core EXAFS

Added On: 03/05/2021 09:34


Discipline Tags:

Physics Hard condensed matter - structures Materials Science

Technical Tags:

Diffraction Spectroscopy X-ray Absorption Spectroscopy (XAS)