学術雑誌論文

学術雑誌論文

text

Journal of the European Ceramic Society. 2025, 46(4), p. 117927

Development of mid-infrared-transmitting cryolite ceramics via a cold sintering process below 200 °C

Elsevier Ltd

英語

text

2025-11-06

https://doi.org/10.1016/j.jeurceramsoc.2025.117927

Sato N., Yoshioka T., Kitagaki T., et al. Development of mid-infrared-transmitting cryolite ceramics via a cold sintering process below 200 °C. Journal of the European Ceramic Society 46, 117927 (2026); https://doi.org/10.1016/j.jeurceramsoc.2025.117927.

This study demonstrates, for the first time, the successful fabrication of mid-infrared-transmitting cryolite (Na₃AlF₆) ceramics via a cold sintering process (CSP) below 200 °C. Cryolite powders were synthesized by the solution precipitation and followed thermal treatment to control particle size ranging from 140 nm to 1.5 µm and moisture content that effects on the IR transmittance. Bulky dense cryolite ceramics could be obtained by the CSP using optimized synthesized cryolite powders. The resulting ceramics achieved high relative density (∼90 %) and IR transmittance (over 80 % at 1 mm thickness) in the 3.8–5.6 µm wavelength range although relatively low sintering temperature below 200 °C. Furthermore, it was clarified that a critical balance exists between pore size and hydroxyl content for the transmission properties of cryolite ceramics. The present findings thus establish a sustainable, low-temperature route for producing optical fluoride ceramics suitable for infrared applications.

This article is licensed under a Creative Commons Attribution 4.0 International License.

103526

Development of mid-infrared-transmitting cryolite ceramics via a cold sintering process below 200 °C

Elsevier Ltd

英語

2025-11-06

Journal of the European Ceramic Society

46

4

117927

https://doi.org/10.1016/j.jeurceramsoc.2025.117927

https://hdl.handle.net/11094/103526