Abstract
ZnS nanopowders annealed at low temperatures (≤550 °C) have a pure cubic structure, while a small amount of hexagonal phase formed in specimens annealed at temperatures ≥700 °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 (≤550 °C) exhibited low transmittance, because of their porous microstructure. ZnS ceramics that were synthesized using ZnS powders annealed at high temperatures (≥800 °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 1020 °C using the nanopowders annealed at 750 °C exhibited dense microstructure, with a large transmittance, 68%, in the wavelength range 6.0–12 μm.
| Original language | English |
|---|---|
| Journal | Journal of the European Ceramic Society |
| DOIs | |
| Publication status | Accepted/In press - 2018 Jan 1 |
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Keywords
- Annealing
- Fourier transform infrared spectroscopy(FTIR)
- Microstructure
- Nano-powder
- ZnS transparent ceramics
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry
Cite this
Microstructural and optical properties of the ZnS ceramics sintered by vacuum hot-pressing using hydrothermally synthesized ZnS powders. / Lee, Ku Tak; Choi, Boo Hyun; Woo, Jong Un; Kang, Jeong Su; Paik, Jong Hoo; Chu, Byoung Uck; Nahm, Sahn.
In: Journal of the European Ceramic Society, 01.01.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Microstructural and optical properties of the ZnS ceramics sintered by vacuum hot-pressing using hydrothermally synthesized ZnS powders
AU - Lee, Ku Tak
AU - Choi, Boo Hyun
AU - Woo, Jong Un
AU - Kang, Jeong Su
AU - Paik, Jong Hoo
AU - Chu, Byoung Uck
AU - Nahm, Sahn
PY - 2018/1/1
Y1 - 2018/1/1
N2 - ZnS nanopowders annealed at low temperatures (≤550 °C) have a pure cubic structure, while a small amount of hexagonal phase formed in specimens annealed at temperatures ≥700 °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 (≤550 °C) exhibited low transmittance, because of their porous microstructure. ZnS ceramics that were synthesized using ZnS powders annealed at high temperatures (≥800 °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 1020 °C using the nanopowders annealed at 750 °C exhibited dense microstructure, with a large transmittance, 68%, in the wavelength range 6.0–12 μm.
AB - ZnS nanopowders annealed at low temperatures (≤550 °C) have a pure cubic structure, while a small amount of hexagonal phase formed in specimens annealed at temperatures ≥700 °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 (≤550 °C) exhibited low transmittance, because of their porous microstructure. ZnS ceramics that were synthesized using ZnS powders annealed at high temperatures (≥800 °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 1020 °C using the nanopowders annealed at 750 °C exhibited dense microstructure, with a large transmittance, 68%, in the wavelength range 6.0–12 μm.
KW - Annealing
KW - Fourier transform infrared spectroscopy(FTIR)
KW - Microstructure
KW - Nano-powder
KW - ZnS transparent ceramics
UR - http://www.scopus.com/inward/record.url?scp=85047223575&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85047223575&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2018.05.018
DO - 10.1016/j.jeurceramsoc.2018.05.018
M3 - Article
AN - SCOPUS:85047223575
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
ER -