Defect Structure Formed at Different Stages οf Growth Process in Erbium, Calcium and Holmium Doped YVO4 Crystals

A. Malinowskaa, E. Wierzbickaa, M. Lefeld-Sosnowskab, K. Wieteskac, W. Wierzchowskia, T. Łukasiewicza, M. Świrkowicza and W. Graeffd a Institute of Electronic Materials Technology, Wólczyńska 133, PL-01-919 Warsaw, Poland b Institute of Experimental Physics, University of Warsaw, Hoża 69, PL-00-681 Warsaw, Poland c Institute of Atomic Energy, PL-05-400 Otwock-Świerk, Poland d HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg, Germany

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The defect structure of YVO4 single crystals doped with Er3+, Ho3+ and Ca2+ were studied by X-ray diffraction topographic methods, using laboratory and synchrotron radiation sources. Variously developed block structure was the dominating imperfection of the investigated crystals observed both in conventional Lang and synchrotron topographs. The evaluation of block misorientation was realised by means of superimposed projection and section white beam synchrotron radiation topographs. More possibilities of following the mutual rotation of blocks were provided by means of white beam synchrotron radiation WBSR projection topographs exposed through the fine mesh.

DOI: 10.12693/APhysPolA.117.328 PACS numbers: 61.72.Ff