INVESTIGATION OF THE DISLOCATION STRUCTURE IN HCP SINGLE CRYSTALS BY MEANS OF THE ROCKING CRYSTAL METHOD
摇摆晶体法研究六角密堆单晶体中的位错结构

A single crystal contains a large number of dislocations after its growth, which can give rise to deflection and distortion of the crystal lattice. In this study the disloctaion struc-ture of hcp single crystals was investigated by means of the rocking crystal method.The theoretical calculation is based on the Krivoglaz model which was developed fromthe kinematic diffraction theory. Beryllium single crystals. due to their excellent opticalproperties as X-ray monochromators. were chosen as a specimen and their rockingcurves were investigated. The dislocations generated on different glide systems- for ex-ample basal and prismatic dislocations. contribute differently to each reflection. There-fore by studying the rocking curves of different reflections it is possible to determinethe dislocation structure within the crystal This is of great imprortance in developingthe crystal monochromators. which usually require tailored dislocation structures byoptimising the growth and heat treatment conditions.