3D DuMond diagrams of multi-crystal Bragg-case synchrotron topography. II. Curved sample |
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Authors: | M Servidori F Cembali S Milita |
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Institution: | (1) CNR–Istituto LAMEL, Via Gobetti 101, 40129 Bologna, Italy, IT |
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Abstract: | The dimensional features of multi-crystal synchrotron X-ray topographs are explained by 3D DuMond diagrams for a flat double-crystal
monochromator and a curved sample. Symmetric Bragg-case reflections are assumed for all crystals. σ–σ and σ–π geometries are
considered, where the diffraction plane of the sample is parallel and perpendicular, respectively, to the vertical diffraction
plane of the monochromator (σ polarization). It is shown that the shape of the sample image is closely connected to the shape
of the volume shared by the diffraction domains of monochromator and sample in the 3D DuMond diagram. In particular, for the
σ–π set-up, the image shape depends on the curvature value and sign. An experiment is reported for this latter crystal geometry
to determine lattice mismatch, its lateral homogeneity and curvature value and sign in a sample made of epilayer and substrate.
Received: 31 July 2000 / Accepted: 25 January 2001 / Published online: 26 April 2001 |
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Keywords: | PACS: 61 10 -i |
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