Corrosion behaviors of the precursor glass (ZBLAN) of fluoride fibers in solutions of different pH values are studied. After seven d of corrosion, the infrared transmittance of ZBLAN decreases to almost 0 in acidic and neutral environments. However, there is no significant loss of transmittance in an alkaline environment. Similarly, the surfaces of the samples in acidic or neutral environments are severely corroded, whereas in alkaline environments, they are slightly corroded. In addition, it is found that samples corroded in neutral water have a complete crystallization phenomenon, wherein complex crystal phases emerged. However, no characteristic peaks of the crystal phase are observed in the samples corroded in the acidic and alkaline environments. The corrosion mechanism is investigated based on the change in the concentration of ZBLAN constituent elements in the solution via inductively coupled plasma (ICP) emission spectrometry.
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