X-ray topographic determination of the granular structure in a graphite mosaic crystal: a 3D reconstruction 

M. Ohler (a), M. Sanchez del Rio  (a), A. Tuffanelli (b), M. Gambaccini (b), 
A. Taibi (c,*), A. Fantini (b) and G. Pareschi (d)

(a) European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
(b) Dipartimento di Fisica, Università di Ferrara and INFN Sezione di Ferrara, 
    Via Paradiso 12, I-44100 Ferrara, Italy
(c) Department of Medical Physics and Bioengineering, University College 
    London, Shropshire House, 11-20 Capper Street, London, WC1E 6JA, UK
(d) Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Italy
(*) Permanent address: Dipartimento di Fisica, Università di Ferrara and INFN 
    Sezione di Ferrara, Via Paradiso 12, I-44100 Ferrara, Italy

Abstract

Section topographs recorded at different spatial locations and at different 
rocking angles of a Highly Oriented Pyrolytic Graphite (HOPG) crystal allow to 
obtain three-dimensional maps of the local angular-dependent scattering power. 
This is done with a direct reconstruction from the intensity distribution on 
such topographs. The maps allow to extract information on local structural 
parameters such as size, form and internal mosaic spread of crystalline 
domains. This data analysis leads to a new method for the characterisation of 
mosaic crystals. Perspectives and limits of applicability of this method are 
discussed.