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research papers
X-ray oscillation and Laue photographs of solution-grown single crystals of cadmium iodide frequently show extension of the diffraction spots into small continuous or discontinuous arcs. The phenomenon is satisfactorily explained in terms of tilt boundaries formed by vertical alignment of edge dislocations, created during crystal growth. Measurement of arc lengths affords a convenient method for the estimation of dislocation densities inside the crystals. Calculations made on several crystals give the value of dislocation density, ~ 105 - 106 dislocations cm-1.