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Dynamical properties of dislocations in silver halide crystals have been studied by an internal friction measurement using a 100 kHz longitudinal composite oscillator. Several sharp peaks of internal friction are observed at temperatures around 310°C, 250°C and 150°C etc. in the case of silver chloride, and at around 230°C, 180°C and 100°C etc. in the case of silver bromide, when the specimens are bent and annealed. The half widths of these peaks are several degrees, which are unreasonably smaller than those predicted by the theory of dislocation diffusion. The peaks are considered to be due to the simultaneous liberation of dense precipitates of lattice defects on dislocations. The elastic moduli of specimens change with temperature remarkably, and the softening due to dislocation is more prominent at low temperatures than at high temperatures.

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