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Proceedings Paper

High Purity Zirconium Tetrafluoride For Fluoride Glass Applications
Author(s): H. P. Withers; V. A. Monk; G. A. Cooper
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Paper Abstract

A totally anhydrous process has been developed for the preparation of high purity zirconium tetrafluoride for use in low loss fluoride glass applications. The ZrF4 purityis 99.99997% with respect to all transition elements (excluding HO based on analysis by spark source mass spectrometry (SSMS) and graphite furnace/atomic absorption spectroscopy (GF/AA). The only transition elements detected by these techniques were Fe, Ni and Cr, while Co and Cu were consistently below the detection limits. The anhydrous nature of the process, which is strictly maintained by the choice of reactants, affords product with very low oxide and hydroxide content. Total oxygen concentrations of less than 10 ppm have been measured by the inert gas fusion technique. A ZBLAN glass composition prepared using this ZrF4 showed extremely low UV absorption having an absorption constant of 1 cm-1 at 198 nm. ZrF4 from this process was also used in a ZBLAN glass fiber whose minimum optical loss was measured at 6.3 dB/km over 150 meters of fiber. The process is straightforward to scale up and has also been demonstrated to be useful for the preparation of HfF4, BaF2, A1F3 and LaF3.

Paper Details

Date Published: 2 June 1989
PDF: 8 pages
Proc. SPIE 1048, Infrared Fiber Optics, (2 June 1989); doi: 10.1117/12.951384
Show Author Affiliations
H. P. Withers, Air Products and Chemicals, Inc. (United States)
V. A. Monk, Air Products and Chemicals, Inc. (United States)
G. A. Cooper, Air Products and Chemicals, Inc. (United States)

Published in SPIE Proceedings Vol. 1048:
Infrared Fiber Optics
James A. Harrington; Abraham Katzir, Editor(s)

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