Abstract
It is well known that the effect of mechanical work, such as grinding or the application of pressure, is progressively to convert zinc sulphide of initially hexagonal structure towards the cubic structure. In the course of an investigation (1) into the effect of grinding on the structure and luminescence of zinc and zinc-cadmium sulphides, it became necessary to measure the relative amounts of cubic and hexagonal stacking after various times of grinding.
Smith (2) and Wecker (3) have both suggested the use of relative intensities of certain x-ray powder reflections for evaluating the hexagonal: cubic stacking ratio. We have used the principle of the method suggested by Smith, but we have found it necessary to make two important modifications to the method as described by him.
