Synchrotron Diffraction topo-gra-phy in Studying of the Defect Structure in Crystals Grown by the Czochralski Method
W. Wierzchowski a, K. Wieteska b, A. Malinowska a, E. Wierzbicka a, M. Lefeld-Sosnowska c, M. Świrkowicz a, T. Łukasiewicz a, A. Pajączkowska a and C. Paulmann d
a Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland
b National Centre for Nuclear Research, A. Sołtana 7, 05-400 Otwock-Świerk, Poland
c Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
d HASYLAB at DESY, Notkestr. 85, D-22607 Hamburg, Germany
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The synchrotron diffraction topo-gra-phy had been widely used for investigation of the structural defects in crystals grown by the Czochralski method. Similarly as conventional diffraction topo-gra-phy, the synchrotron topo-gra-phy consists in recording with high spatial resolution of the beam formed by the Bragg reflection from the crystal. The advantages of synchrotron sources come from the possibilities of using the wavelength from a wide spectral range, improved high spatial resolution and collimation of the beam as well as from shortening the time necessary for the investigation. The synchrotron diffraction topo-gra-phy includes experimentally simpler white beam topo-gra-phy and more complicated monochromatic beam (multicrystal) topo-gra-phy, where the beam is formed by monochromators. In the case of Czochralski-grown crystals the synchrotron diffraction topo-gra-phy can be used for studying of the individual dislocations and their complexes such as glide bands or sub-grain boundaries, individual blocks, twinning, the domain structure and various segregation effects negatively affecting crystal properties. In addition, the topographical investigation can provide information concerning the reasons for the generation of defects, useful in the improving of the technology. In the present paper the possibilities of the synchrotron diffraction topo-gra-phy are discussed on the basis of several investigations of the Czochralski-grown oxide and semiconductor crystals, performed by the authors at HASYLAB. The majority of the results concern the oxide crystals grown at the Institute of Electronic Materials Technology, in particular garnets, orthovanadates, mixed calcium barium and strontium niobates as well as praseodymium lanthanum aluminates.

DOI: 10.12693/APhysPolA.124.350
PACS numbers: 61.72.Ff