title: On the structure of high-pressure high-temperature eta-O2.
abstract: In situ high-pressure high-temperature x-ray diffraction and optical studies have been conducted on solid oxygen between 10 and 20 GPa and up to 700 K. Optical observations and Raman spectroscopic studies have been utilized to confirm the existence of eta-O(2) and to identify phase behavior and phase boundaries of beta-, epsilon- and eta-O(2) at elevated temperatures. Subsequent single-crystal synchrotron x-ray diffraction studies yielded the structure of the eta-O(2) phase at 15.9 GPa and 625 K.
authors.affiliation: SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom.
authors.forename: Lars F
authors.initials: LF
authors.lastname: Lundegaard
authors.forename: Christophe
authors.initials: C
authors.lastname: Guillaume
authors.forename: Malcolm I
authors.initials: MI
authors.lastname: McMahon
authors.forename: Eugene
authors.initials: E
authors.lastname: Gregoryanz
authors.forename: Marco
authors.initials: M
authors.lastname: Merlini