Pressure-induced structural changes in α-MoO3 probed by X-ray absorption spectroscopy. (March 2019)

• Record Type: Journal Article
• Authors: Jonane, Inga; Anspoks, Andris; Nataf, Lucie; Baudelet, Francois; Irifune, Tetsuo; Kuzmin, Alexei
• Is Part Of: IOP conference series. Volume 503(2019)
• Publication Date: 2019-03
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/503/1/012018
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: Energy-dispersive X-ray absorption spectroscopy at the Mo K-edge was used to study pressure-induced (up to 36 GPa) changes in the local atomic structure of 2D layered oxide α -MoO3 . A linear combination analysis based on the low and high-pressure X-ray absorption near edge structure (XANES) spectra shows clear evidence of two high-pressure phases, existing at 18-25 GPa and above 32 GPa. The first transition is due to gradual decrease of the interlayer gap, whereas the second one – to its collapse and oxide structure reconstruction. The local atomic structure around molybdenum atoms at 0.2, 18.5 and 35.6 GPa was determined from the extended X-ray absorption fine structure (EXAFS) using reverse Monte Carlo calculations.