Cracks and dislocations at Vickers, Berkovich and cube corner indentations in (0001) GaN single crystals

Autor:	Hartmut S. Leipner, Gunnar Leibiger, Wolfgang Fränzel, I. Ratschinski, J. Michler, Frank Heyroth, Frank Habel, W. Mook
Rok vydání:	2012
Předmět:	Materials science business.industry Scanning electron microscope Cathodoluminescence Condensed Matter Physics Secondary electrons Symmetry (physics) law.invention Optics Optical microscope law Indentation Cube Composite material Deformation (engineering) business
Zdroj:	physica status solidi c. 10:76-79
ISSN:	1610-1642 1862-6351
DOI:	10.1002/pssc.201200388
Popis:	(0001) GaN single crystals having a thickness of 3.4 mm and a density of in-grown dislocations of 3.5 x 106 cm-2 have been deformed at room temperature using a cube corner, a Berkovich and a Vickers indenter, respectively. Cube corner indentations were performed in a scanning electron microscope in order to observe the deformation in situ. Subsequently, cracks and dislocations at the indentations were investigated by means of optical microscopy, scanning electron microscopy in secondary electron contrast and cathodoluminescence imaging. The arrangement of dislocations is determined by the symmetry of the indented surface. In contrast, the formation of cracks depends on both the shape and the orientation of the indenter. (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Databáze:	OpenAIRE
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