Regensburg 2016 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MM: Fachverband Metall- und Materialphysik
MM 15: Poster session I
MM 15.30: Poster
Monday, March 7, 2016, 18:00–20:00, Poster B3
pressure induced phase transition in XeF2 — •Gang Wu1, Xiaoli Huang2, Yanping Huang2, Xin Li1, Fangfei Li1, and Tian Cui1,2 — 1National Laboratory of Superhard Materials, Jilin University, Changchun 130012, P.R. China — 2College of Physics, Jilin University, Changchun 130012, P.R. China
It is well known that high pressure will bring materials some unique properties such as metallization or superconductivity. XeF2 was reported to metalize under pressure. However, there is still controversy on its high pressure structure between the recent experimental and theoretical research. In this study, in-situ Synchrotron X-ray diffraction, Raman spectra and theoretical calculations are used to investigate the structure of XeF2 up to 94GPa. The experimental and theoretical Raman spectra results indicate that the ambient structure of XeF2 (I4/mmm) transforms into a Immm structure at 26GPa, and then high pressure phase (space group Pnma) appears at 56GPa. In the XRD study, the rietveld refinement results show that the I4/mmm structure (a=3.8242Å, c=6.7882Å, Z=2, 7.5GPa) changes into Immm at 26GPa(a=3.3789Å, b=3.4056 Å, c=6.5883Å, Z=2), and stabilizes with the pnma structure at 60GPa (a=4.5275Å, b=4.5025Å, c=6.4703Å, Z=4), which is in accordance with our Raman study.