Counteracting methods of nodular growth in CVD-ZnS

Chemical vapor deposition method was used to manufacture bulk ZnS materials (CVD-ZnS). Nodular growth phenomenon in bulk CVD-ZnS was studied systematically. Through the analysis of microstructure and macrostructure, some growth centers with larger size were seen as the origin of nodular cells. Growth direction of nodular cells was changed to cross direction, while growth rate of nodular cells was faster than other normal grains. All of these factors led to the spherical objects on the surface of products. A turbinate structure was observed from nodular cell in cut-plane samples as well. Meanwhile, according to the different nodular phenomena, the main mechanisms of different growth centers were discussed. The counteracting methods, based on above conclusions, were explored and confirmed through different deposited experiments. Thus, the nodular growth in CVD-ZnS could be restrained effectively.