X-ray topographic study of growth defects of trans-stilbene crystals grown from solutions

Abstract

Cite this article as: Helmut Klapper, Natalia Zaitseva, Leslie Carman, X-ray topographic study of growth defects of trans-stilbene crystals grown from solutions, Journal of Crystal Growth, http://dx. AbstractSingle crystals of trans-stilbene, C 14 H 12, with properties suitable for high-energy neutron detection were grown from solution in anisole and toluene by the temperature reduction method with growth rates up to 6 mm/day. From these crystals, slices of appropriate orientation and thickness of 2 -4 mm were cut and studied by X-ray diffraction topography applying the Lang method using CuKα radiation. The topographs exhibit growth defects such as liquid inclusions, dislocations, striations, and faulty growth-sector boundaries. These defects occur in the same typical arrangements and geometries as is observed in all kinds of crystals grown on habit faces from solution. Besides growth dislocations originating from inclusions and propagating with the growth front, many plastic glide dislocations in the shape of loops or half-loops emitted from inclusions by stress relaxation are observed. The glide system underlying this plasticity is discussed.

X-ray Diffraction Topography (Imaging) of Crystals Grown from Solution: A Short Review

“…He presented an example of the latter in slip dislocations in the form of half-loops originating at a small gas bubble in benzil. A more recent example is of closed dislocation loops nucleated at liquid inclusions of trans -stilbene (C 14 H 12 ). Of dislocations generated during growth, Klapper further distinguished those that are connected with the growth front and those generated behind the growth front .…”

Kyropoulos growth of a 300 g SrB4O7 single crystal using a twin-type stirring blade

“…Moreover, there are inclusions or plane defects along the (101) growth sector similar to those previously reported along growth sector boundaries. [27][28][29][30] Since these inclusions are attributed to the unstable growth of the (101) planes, they can be suppressed by controlling the crystal shape during growth.…”