Sintering and optical properties of transparent ZnS ceramics by pre-heating treatment temperature |
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Authors: | Seo-Yeong Yeo Tae-Hyeong Kwon Chang-Sun Park Chang-Il Kim Ji-Sun Yun Young-Hun Jeong Youn-Woo Hong Jeong-Ho Cho Jong-Hoo Paik |
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Affiliation: | 1.Electronic Convergence Materials Division,Korea Institute of Ceramic Engineering & Technology,Jinju,South Korea |
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Abstract: | The main objective of our work is to increase transmittance in the mid infrared region by removing impurities through the pre-heating treatment of zinc sulfide (ZnS) produced by hydrothermal synthesis. The pre-heating treatment proceeded at 450 to 600 °C for 2 h under vacuum atmosphere (10?2 Torr). It was confirmed that the particle size increased as the pre-heating temperature increased. Additionally, all ZnS nano powders had a sphalerite (cubic) structure unaffected by pre-heating treatment. The ZnS nano powders were sintered by hot-press sintering method. As the pre-heating temperature increased, transmittance was improved due to the decreasing of porosity, increase of particle size, and the removal of impurities (carbon and sulfate). However, when the pre-heating treatment temperature was 600 °C, the transmittance slightly decreased due to the formation of a hexagonal phase. The ZnS ceramic with pre-heating treatment at 550 °C showed the highest transmittance (71.6%) and density (99.9%). |
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