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http://dx.doi.org/10.5369/JSST.2019.28.4.256

Optical Properties of Mid-infrared Transparent ZnS Ceramics with Different Molar Ratio of S/Zn  

Yeo, Seo-Yeong (Electronic Convergence Division, Korea Institute of Ceramic Engineering & Technology)
Park, Buem-Keun (Electronic Convergence Division, Korea Institute of Ceramic Engineering & Technology)
Kim, Chang-Il (Electronic Convergence Division, Korea Institute of Ceramic Engineering & Technology)
Paik, Jong-Hoo (Electronic Convergence Division, Korea Institute of Ceramic Engineering & Technology)
Publication Information
Journal of Sensor Science and Technology / v.28, no.4, 2019 , pp. 256-261 More about this Journal
Abstract
In this study, mid-infrared transparent zinc sulfide (ZnS) ceramics were fabricated through hydrothermal synthesis with different molar ratios of S/Zn (S/Zn = 0.8, 1.0, 1.2, 1.4, and 1.6). The ZnS ceramics were sintered at a relatively low temperature of $850^{\circ}C$ to prevent the occurrence of the hexagonal phase featuring optical anisotropy. The phase composition, microstructure, and optical properties of the ZnS ceramics were subsequently investigated by employing X-ray diffraction, scanning electron microscopy, and Fouriertransform infrared spectroscopy. The results obtained indicate that the ZnS nanoparticles feature the cubic phase, without the hexagonal phase. Moreover, with increasing S, the crystallinity and particle size of the ZnS nanoparticles increased. The crystallinity and density of the ZnS ceramics improved when the molar ratio of S was higher than the molar ratio of Zn, thereby enhancing the transmittance. Furthermore, the ZnS ceramic with an S/Zn value of 1.2 was found to exhibit the highest transmittance of approximately 69% owing to the reduced occurrence of the hexagonal phase and a high density of 99.8%.
Keywords
Hotpress; Sintering; ZnS; infrared lens; Hydrothermal synthesis;
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Times Cited By KSCI : 1  (Citation Analysis)
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