Fibrous single crystals of BiSr-Ca-Cu-0 have been grown from the melt of t h e corresponding oxides and carbonates. The crystals are mostly flat ribbon-like whiskers with t h e long edge in the a direction and thec axis perpendicular to the face. There exists a superstructure in the b direction. Dislocations observed are mainly parallel to the a axis. The whiskers are elastic and they can b e bent with a radius of curvature of down to 0.02 mm. The whiskers show a single-phase behaviour in the temperature deoendence of the electrical resistivity with a critical temperature T,, = 81.5 K
Cryst. Res. Technol. 34 1999 4 509-517Compositional inhomogeneities of (Si,Ge) single crystals grown by the radio frequency (RF) heated float zone technique have been studied using the back-scattered electron (BSE) mode of a scanning electron microscope. Numerical analysis of the images by Fast Fourier Transformation (FFT) showed that the number of spatial frequencies with substantial amplitudes is increased when investigating longitudinal sections of crystals containing dislocations instead of dislocation-free crystals. This can be attributed to different growth conditions in terms of super-cooling.keywords: fourier analysis, scanning electron microscopy, doping and impurity implantation
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