Sintering of Zinc Sulfide

The mechanisms of the sintering of ZnS were determined by measurement of the rate of growth of the necks between polycrystalline spheres. In vacuum (10 −6 mm Hg) at temperatures higher than 600° C the mechanism of sintering is that of volume diffusion with coefficient D v , = 1.06 × 10 −2 exp (‐26,400/RT); below 600°C surface diffusion predominates, with coefficient D 3 , = 9.14 × 10 ‐3 exp (‐5700/RT). In Zn vapor (10 −2 mm Hg) between 550° and 650°C the predominating mechanism of sintering is surf ace diffusion, D 3 , = 7.06 × 10 −2 exp (‐8600/RT). It has been found that in an argon atmosphere the diffusion coefficient is much lower.