Wondering if a glass sheet coated with ITO be used with liquid sodium at very high temperatures. Does ITO reacts with Na at all?
Firstly the glass substrate will soften, and even melt, and the ITO coating will diffuse into it. ITO coated glass will not work at 800 C, in fact beyond it gets affected beyond 300 deg C. Some SnO2 coated glass can go slightly to much higher temperatures, say upto 500 to 600 deg C. BUt the conductivityof the transparent conductor (SnO2) gets affected.
Secondly if you deposit ITO on quartz substrate, now the substrate will not get affected.
But the ITO coating will pick up too much oxygen, and will no longer be conducting as it was before at room temperature.
If you need conducting oxide electrodes, then coating of some different oxides like SrRuO3, Lanthanum nickelate (LaNiO3) can with stand high temperatures. But you have to deposit such oxide by pulsed laser ablation upon a high temperature withstanding substrate like quartz. At the moment I am sure such electrodes materials can work, but whether they will be optically transparent or not, needs to be checked.
K. Sreenivas
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