X-ray topographic determination of the granular structure in a graphite mosaic crystal: a three-dimensional reconstruction

Section topographs recorded at different spatial locations and at different rocking angles of a highly oriented pyrolytic graphite (HOPG) crystal allo w three-dimensional maps of the local angular-dependent scattering power to be obtained. This is performed with a direct reconstruction from the inten sity distribution on such topographs. The maps allow the extraction of info rmation on local structural parameters such as size, form and internal mosa ic spread of crystalline domains. This data analysis leads to a new method for the characterization of mosaic crystals. Perspectives and limits of app licability of this method are discussed.