Diffuse Scattering from Incommensurate Rb-IV
Analysis of the Bragg peaks from a crystal gives information on only single-site properties of the structure, such as average atomic positions, mean square atomic displacement amplitudes and site occupancies. Diffuse scattering, on the other hand, being the Fourier transform of the pair correlation function, contains information about two-site properties and gives direct information about the mutual behaviour of (neighbouring) pairs of atoms. We have recently found that single-crystals of the incommensurate high-pressure phase of Rubidium exhibit sheets of diffuse scattering as a result of the motion of the 1-D chains of atoms within the structure. In this talk I will demonstrate the additional structural information that can be obtained from analysis of this scattering.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..