Suppression of crystallization in ZBLAN glass by rapid heating and cooling processing

Ong, Teng-Cheong and Fogarty, Ben and Steinberg, Ted and Jaatinen, Esa and Bell, John (2019) Suppression of crystallization in ZBLAN glass by rapid heating and cooling processing. International Journal of Applied Glass Science, 10 (3). pp. 391-400. ISSN 2041-1286


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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: No
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - USQ Other
Faculty/School / Institute/Centre: Current - USQ Other
Date Deposited: 17 Sep 2020 05:05
Last Modified: 24 Sep 2020 05:56
Uncontrolled Keywords: cooling rate; crystallization; diffraction experiment; Joule heating; microscopyohmic heating; rapid cooling; rapid heating; ZBLAN
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401699 Materials engineering not elsewhere classified
Socio-Economic Objectives (2008): B Economic Development > 85 Energy > 8505 Renewable Energy > 850599 Renewable Energy not elsewhere classified
Socio-Economic Objectives (2020): 17 ENERGY > 1708 Renewable energy > 170899 Renewable energy not elsewhere classified
Identification Number or DOI: https://doi.org/10.1111/ijag.13096
URI: http://eprints.usq.edu.au/id/eprint/39381

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