Study on Mechanism of Twin Plane Formation in AgBr and AgCl Grains

Abstract

A study was made on the mechanism of twin plane formation during the nucleation ofAgBr and AgCl grains. The nuclei were set to grow without dissociation and re-nucleation. The grains thus obtained had (111) faces on the surface and the number of twin planes in each grain was judged according to a conventional way on the basis of its shape. The dependence of the number of twin planes per grain on the probability of twin plain formation was in accordance with binominal distribution. The ratio of the number ofAgBr grains with parallel twin planes to all the grains with multi twin planes got to more than 50% while that ofAgCl grains was about 10%. The result was explained by the difference of growth rate of (111) and (100) faces between AgBr and AgCl grains.