Structure and properties of Kr–O2 condensed films
Abstract
Electron diffraction studies of the structure of condensed Kr–O2 films have been carried out. Measurements were made in the temperature range 5−35 K on samples whose effective thickness varied from 30−40 to 400 Å. A considerable solubility (up to 40 mol % O2) was reported for the components on the Kr side below 35 K. This was facilitated by the closeness of the volumes corresponding to a partially oriented-disordered O2 molecule and a Kr atom. The solubility of Kr in α- and β-O2 was found to be negligible. The addition of small amounts of an inert gas initiated the formation of α′-phase which was transformed into β-modification near the sublimation temperature of O2. For Kr concentrations ≳ 10%, a decomposition into α and β phases was observed. Solutions with a γ-O2-structure were found to border the solidus line in the cases when the Kr concentration was <30%.