소결온도에 의한 중적외선 투과용 ZnS 세라믹스의 광학적 특성
Optical Properties of Middle Infrared Transparent ZnS Ceramics at Various Sintering Temperatures
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Infrared transparent ZnS ceramics were synthesized through hydrothermal synthesis (180oC, 70 h) and sintered using a hot press pro- cess at 750oC-1000oC. We carried out x-ray diffraction, scanning electron microscopy, and Fourier transform-infrared spectroscopy to confirm the optical properties of the ZnS ceramics after sintering at various temperatures. The phase of ZnS nanopowders was a singlephase (cubic) without the hexagonal phase. However, as sintering temperature increased, the formation and increment of hexagonalstructures was confirmed. The ZnS ceramic sintered at a temperature of 750oC showed poor transmittance because it was not completely sintered and because of the pore effect. The ZnS ceramic with the highest transmittance (approximately 69%) was sintered at 800oC. As sintering temperature increased, transmittance gradually decreased owing to the increase in the formation of the hexagonal phase.
Abstract
Infrared transparent ZnS ceramics were synthesized through hydrothermal synthesis (180oC, 70 h) and sintered using a hot press pro- cess at 750oC-1000oC. We carried out x-ray diffraction, scanning electron microscopy, and Fourier transform-infrared spectroscopy to confirm the optical properties of the ZnS ceramics after sintering at various temperatures. The phase of ZnS nanopowders was a singlephase (cubic) without the hexagonal phase. However, as sintering temperature increased, the formation and increment of hexagonalstructures was confirmed. The ZnS ceramic sintered at a temperature of 750oC showed poor transmittance because it was not completely sintered and because of the pore effect. The ZnS ceramic with the highest transmittance (approximately 69%) was sintered at 800oC. As sintering temperature increased, transmittance gradually decreased owing to the increase in the formation of the hexagonal phase.
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