Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7897823 | Journal of the European Ceramic Society | 2018 | 8 Pages |
Abstract
ZnS nanopowders annealed at low temperatures (â¤550â¯Â°C) have a pure cubic structure, while a small amount of hexagonal phase formed in specimens annealed at temperatures â¥700â¯Â°C. The particle sizes of the ZnS nanopowders increased with the annealing temperature. ZnS ceramics that were sintered using ZnS nanopowders annealed at low temperatures (â¤550â¯Â°C) exhibited low transmittance, because of their porous microstructure. ZnS ceramics that were synthesized using ZnS powders annealed at high temperatures (â¥800â¯Â°C) containing large agglomerated particles, also exhibited low transmittance, due to the presence of a liquid phase. A carbonate absorption band was found from the ZnS ceramics with small grains, because carbon ions diffused from the graphite mold into the ZnS ceramics during sintering, probably through the grain boundaries, and formed carbonates. A ZnS ceramic that was sintered at 1020â¯Â°C using the nanopowders annealed at 750â¯Â°C exhibited dense microstructure, with a large transmittance, 68%, in the wavelength range 6.0-12â¯Î¼m.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Ku-Tak Lee, Boo-Hyun Choi, Jong-Un Woo, Jeong-Su Kang, Jong-Hoo Paik, Byoung-Uck Chu, Sahn Nahm,