The Phase Transformation during Crystallization of ZnS

Abstract

In order to investigate the cubic → hexagonal transformation during crystallization of , microcrystalline and microcrystalline containing or with various ratios were thermally treated at 850° or 1150°C in atmospheres of He, , , or their mixtures, and the cubic content in the crystals obtained was estimated by the x‐ray powder diffraction method. The cubic →hexagonal transformation in crystal containing was promoted with a certain amount of blended at 850°C in all atmospheres. In, the percent cubic in unblended decreased rapidly in the initial stage, then increased over 0.5 hr ("retransformation"). The percent cubic in blended samples also decreased temporarily but the degrees of retransformation decreased with increasing content. In , unblended remained cubic, while it transformed to hexagonal due to blending with . The transformation reaction in the sample was followed by using a high temperature x‐ray diffractometer. The result showed that the cubic peak intensity for decreased with temperature and disappeared near 550°C, while the hexagonal peak intensity for the solid solution emerged near 650°C. The cubic → hexagonal transformation in microcrystalline containing was inhibited with the amount of blended at 1150°C in all atmospheres.