X-Ray absorption fine structure measurements, and computer simulations were used to solve the structure of mixed salts RbBrxCl1-x. Deviations from the average NaCl structure (nearest neighbor distances and buckling angles) were observed which maximize in the midst of the concentration range. This induces a local elastic strain energy which is the cause of the melting point depression below the linear interpolation. It is shown for the first time that the concentration-weighted average of the Rb-Br and Rb-Cl bond lengths is always greater than the average determined by diffraction.
|Number of pages||5|
|Journal||Solid State Communications|
|State||Published - Jul 1996|
Bibliographical noteFunding Information:
by DOE grant DE-FGO6-90ER45425. by the US - Israel BSF Grant 90-00152/l.