Monocrystals were grown from the vapor by using a continuous pulling technique. Large crystals (up to 4.5mm x 3.0mm x 1.5mm) were obtained. The structures of the as-grown crystals were studied by means of X-ray topography and etching. The grown-in dislocation density was estimated to be of the order of 104/cm2. The slip which was introduced by micro-indentation was investigated by using etching techniques.

M.Tachibana, M.Michiyama, H.Sakuma, K.Kikuchi, Y.Achiba, K.Kojima: Journal of Crystal Growth, 1996, 166, 883-7