X-Ray Topographic Studies of Defect Structure in YVO_4 Crystals

• Authors: K. Wieteska , W. Wierzchowski , T. Łukasiewicz , E. Wierzbicka , A. Malinowska , M. Lefeld-Sosnowska , W. Graeff
• Languages of publication: EN

Abstracts

EN

The perfection of YVO_4 crystals, which are predicted to replace formerly used YAG garnets due to higher quantum efficiency and lower excitation level, was studied. The investigations of Czochralski grown undoped YVO_4 single crystals were performed mainly by means of X-ray topographic methods. Both synchrotron and conventional X-ray sources were used. The study revealed relatively high density of weak point-like contrasts which can be most probably interpreted as dislocation outcrops. In regions of the crystal close to its boundary we observed glide bands. It was also found that in some regions the dislocations form local subgrain boundaries. The white beam back reflection and monochromatic beam topography allowed to evaluate a local misorientation which not exceeded several angular minutes. No segregation fringes were observed proving a good homogeneity of chemical composition.

Keywords

EN

61.72.Ff

Discipline

• 61.72.Ff: Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 114
• Issue: 2
• Pages: 455-461

Dates

published

2008-08

received

2007-09-24

Contributors

author

K. Wieteska

• Institute of Atomic Energy, 05-400 Otwock-Świerk, Poland

author

W. Wierzchowski

• Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland

author

T. Łukasiewicz

• Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland

author

E. Wierzbicka

• Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland
• Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

author

A. Malinowska

• Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland
• Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

author

M. Lefeld-Sosnowska

• Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

author

W. Graeff

• HASYLAB at DESY, Notkestr. 85, 22-603 Hamburg, Germany

References

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Identifiers

DOI

10.12693/APhysPolA.114.455