In situ study of zinc peroxide decomposition to zinc oxide by X-ray absorption spectroscopy and reverse Monte-Carlo simulations

Abstract

The Zn K-edge X-ray absorption spectroscopy has been used to investigate in situ the decomposition of zinc peroxide (ZnO${}_2$) to zinc oxide (ZnO). Principal component and linear combination analyses of the EXAFS spectra have been employed to identify the phase composition of the oxide upon heating to 900${}^{\circ }$C. Only the ZnO${}_2$ phase has been found up to 180${}^{\circ }$C, whereas only the nanocrystalline ZnO phase has occurred above 250${}^{\circ }$C. Detailed structural information on the temperature dependence of the local environment of zinc atoms has been obtained using the reverse Monte Carlo simulations. A strong increase of disorder has been found upon approaching the decomposition temperature, evidenced by the broadening of Zn-O and Zn-Zn pair distribution functions and related mean-square relative displacements.

References in corpus (3)

• Treatment of disorder effects in X-ray absorption spectra beyond the conventional approach
• Structural phase transition and its consequences on optical behavior of LaV${}_{1-x}$Nb${}_x$O${}_4$
• The influence of Zn${}^{2+}$ ions on the local structure and thermochromic properties of Cu${}_{1-x}$Zn${}_x$MoO${}_4$ solid solutions

Cited by in corpus (1)

• Microwave-assisted synthesis and characterization of undoped and manganese doped zinc sulfide nanoparticles