Determination of lattice plane curvature and dislocation Burgers vector density in crystals by rocking curve imaging technique

Claudio Ferrari; Nicola Verdi; Daniel Luebbert; Dusan Korytar; Petr Mikulik; Tilo Baumbach; Lukas Helfen; Petra Pernot

doi:10.1117/12.507495

23 December 2003 Determination of lattice plane curvature and dislocation Burgers vector density in crystals by rocking curve imaging technique

Claudio Ferrari, Nicola Verdi, Daniel Luebbert, Dusan Korytar, Petr Mikulik, Tilo Baumbach, Lukas Helfen, Petra Pernot

Author Affiliations +

Proceedings Volume 5195, Crystals, Multilayers, and Other Synchrotron Optics; (2003) https://doi.org/10.1117/12.507495
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

In the present work the lattice plane curvature of a nearly dislocation free S:doped InP and a semi-insulating GaAs wafer crystals has been investigated using the method of X-ray rocking curve imaging based on the FRELON CCD area detector with a pixel resolution from 10 to 40 μm at the ID19 ESRF beamline. The geometry of the experiment is based on a vertical Si (111) monochromator and a horizontal sample scattering planes in the Bragg geometry (σ-π geometry). To determine the local lattice inclination, the effect of such dispersive setup on the measured local diffraction peak position has been accurately determined and the equations to determine the lattice plane curvature of the crystals under the condition of isotropic distribution of dislocation Burgers vectors are obtained. The analysis of the data showed that the shift of the Bragg condition is almost completely due to the lattice tilt rather than to the lattice parameter variation. Lattice displacements from the ideal lattice as large as 200 μm are found at the edges of the InP crystal. Non random distributions of dislocation Burgers vectors are observed in both samples.

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Claudio Ferrari, Nicola Verdi, Daniel Luebbert, Dusan Korytar, Petr Mikulik, Tilo Baumbach, Lukas Helfen, and Petra Pernot "Determination of lattice plane curvature and dislocation Burgers vector density in crystals by rocking curve imaging technique", Proc. SPIE 5195, Crystals, Multilayers, and Other Synchrotron Optics, (23 December 2003); https://doi.org/10.1117/12.507495

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