Abstract
The behavior of a BaF2-ThF4 based glass when exposed to humid air environments and when immersed in several aqueous solutions has been examined by using infrared transmission spectroscopy, scanning electron microscopy and fluoride ion analysis.
The ε OH values at 2.9 μm are 31 ℓ.mol−1.cm−1 for this glass and 19.5 ℓ.mol−1.cm−1 for a fluorozirconate based glass. At temperatures higher than 150°C an hydroxylation process involving a F /OH exchange occurs with an activation energy of 95 kJ.mol−1. At 344°C the diffusion profile of OH groups into the glass shows a penetration depth of 10 μm after 22.5 hours which corresponds to a diffusion coefficient of 1.8.10−12cm2.s−1.
Corrosion tests which have been carried out in several aqueous solutions show that the BaF2-ThF4, based glass is not affected in neutral or basic conditions. On the other hand the samples are highly corroded in acidic solutions and the corrosion rates increase with decreasing pH.
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© 1987 Martinus Nijhoff Publishers, Dordrecht
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Tregoat, D. (1987). Chemical Durability of a BaF2-ThF4 Based Glass. In: Almeida, R.M. (eds) Halide Glasses for Infrared Fiberoptics. NATO ASI Series, vol 123. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3561-7_23
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DOI: https://doi.org/10.1007/978-94-009-3561-7_23
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