Hi
I working on Titanium sol gel. I dried glass at 100 Celcius for an hour and calsination at 500 Celcius for an hour. After this process, the glass is waiting in furnace all day for cooling. When I was looking my sample, I see cracks on surface. Glass is 24x24x0,14 mm.
Dear Atakan Barkınay
Cracks occurred when the critical value for thickness of the thin films is reached. Now, the thin film thickness is in turn directly proportional to the viscosity of the precursor sol. So controlling of the viscosity to an optimum range is very important in the deposition process to obtain a crack-free TiO2 thin film where at below and higher this range, cracks observes in different types. Therefore you should practice different ionic concentration of sol., in [1] and [2] you find a helpful methodology.
Best regards
[1]https://iopscience.iop.org/article/10.1088/1757-899X/340/1/012009/pdf
[2]Conference Paper Understanding the cause of cracking in sol-gel-derived films
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