Pressure-induced structural changes in α-MoO3 probed by X-ray absorption spectroscopy

Functional Materials and Nanotechnologies 2018

Jonane, Inga^1 ; Anspoks, Andris^1 ; Nataf, Lucie^2 ; Baudelet, Francois^2 ; Irifune, Tetsuo^3 ; Kuzmin, Alexei^1

Institute of Solid State Physics, University of Latvia, Kengaraga street 8, Riga

LV-1063, Latvia^1

Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, Gif-sur-Yvette

91192, France^2

Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, Ehime, Matsuyama

790-8577, Japan^3

关键词: Energy dispersive x-ray;    Extended X-ray absorption fine structures;    High-pressure phasis;    Linear combinations;    Local atomic structures;    Oxide structures;    Reverse Monte Carlo;    X-ray absorption near-edge structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/503/1/012018/pdf
DOI  :  10.1088/1757-899X/503/1/012018

来源: IOP

【 摘 要 】

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.