S/Zn의 몰비에 따른 중적외선 투과용 ZnS 세라믹스의 소결과 광학적 특성
Optical Properties of Mid-infrared Transparent ZnS Ceramics with Different Molar Ratio of S/Zn
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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 °C toprevent the occurrence of the hexagonal phase featuring optical anisotropy. The phase composition, microstructure, and optical prop-erties of the ZnS ceramics were subsequently investigated by employing X-ray diffraction, scanning electron microscopy, and Fourier-transform 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% owingto the reduced occurrence of the hexagonal phase and a high density of 99.8%.
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 °C toprevent the occurrence of the hexagonal phase featuring optical anisotropy. The phase composition, microstructure, and optical prop-erties of the ZnS ceramics were subsequently investigated by employing X-ray diffraction, scanning electron microscopy, and Fourier-transform 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% owingto the reduced occurrence of the hexagonal phase and a high density of 99.8%.
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