TIME-RESOLVED 2-DIMENSIONAL OBSERVATION OF THE CHANGE IN X-RAY DIFFUSE-SCATTERING FROM AN ALLOY SINGLE-CRYSTAL USING AN IMAGING PLATE ON A SYNCHROTRON-RADIATION SOURCE

Through the high sensitivity of an area-detector Imaging Plate and the high brilliance of synchrotron radiation, changes in two-dimensional intensity distribution of X-ray diffuse scattering from an AgZn single crystal having the B2-type structure were observed successively during the structural transition from the beta-' phase to the zeta- phase. It has been shown in a series of patterns taken at a time interval of 600 s that a diffuse intensity sheet extending parallel to the (111) relplane gradually loses its intensity without a precursive modulation while weak diffraction spots from the nuclei of the zeta- phase appear superimposed on the sheet with a definite positional relation to the diffraction spots from the beta-' phase. Promising aspects as well as the limits of the method applied to time-resolved measurements of structural changes are discussed.