First topographic results at the European synchrotron radiation facility

Abstract

The first topographic observations performed at the ESRF using the white beam of the ID11 Materials Science wiggler beamline, are described. Several plate-shaped single crystals (Si, Ge, quartz, Ga–YIG, Fe–3%Si, AlPdMn quasicrystals, …), with thicknesses ranging from 0.3 mm (Ge) to 1.4 mm (Fe-3%Si) and even 1 cm (Si), are investigated in the transmission mode. The heat load associated with the wiggler beam has to be reduced. The main features of the topographs are the short exposure times (≈5 × 10−3 to 101 s), the high photon energies corresponding to the recorded Bragg spots (up to ≈ 110 keV), and the good spatial resolution obtained even when setting the film far (from 17 cm to more than 1 m) from the sample. The contrast of dislocation images is consistent with the presently accepted theoretical models.