Suppression of crystallization in ZBLAN glass by rapid heating and cooling processing
Article
Article Title | Suppression of crystallization in ZBLAN glass by rapid heating and cooling processing |
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ERA Journal ID | 200676 |
Article Category | Article |
Authors | Ong, Teng-Cheong (Author), Fogarty, Ben (Author), Steinberg, Ted (Author), Jaatinen, Esa (Author) and Bell, John (Author) |
Journal Title | International Journal of Applied Glass Science |
Journal Citation | 10 (3), pp. 391-400 |
Number of Pages | 10 |
Year | 2019 |
Place of Publication | United States |
ISSN | 2041-1286 |
2041-1294 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/ijag.13096 |
Web Address (URL) | https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1111/ijag.13096 |
Abstract | ZBLAN glass is a heavy metal fluoride glass that tends to undergo heavy devitrification, resulting in a crystalline material. It has many applications, including its use as an optical waveguide for fiber-optic technology. However, when the glass is processed with traditional casting techniques, crystallites form readily that act as scattering centers, which results in large attenuation losses. In this study, it has been experimentally demonstrated that processing ZBLAN rapidly with a heating rate of 25 000 K/min and cooling rate of 4000 K/min yields test samples that are fully amorphous and retain a disordered molecular arrangement characteristic of its molten state. This novel method was developed using a specifically designed equipment named a Rapid Electro-thermal Processing Device, or “REPD.” The REPD applies ohmic heating and thermal conduction to a heat sink to rapidly process the ZBLAN material. The absence of crystallites in the rapidly processed ZBLAN test samples were verified using transmission electron microscopy (TEM) analysis. Applying a theoretical algorithm, the critical cooling rate for yielding fully amorphous ZBLAN glass was determined to be 1081 K/min for a sample volume of 9.4 × 10−8 m3. |
Keywords | cooling rate; crystallization; diffraction experiment; Joule heating; microscopyohmic heating; rapid cooling; rapid heating; ZBLAN |
ANZSRC Field of Research 2020 | 401699. Materials engineering not elsewhere classified |
Byline Affiliations | Queensland University of Technology |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5x40/suppression-of-crystallization-in-zblan-glass-by-rapid-heating-and-cooling-processing
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