The preparation of crackfree and transparent SiO$-2$/ coatings on soda lime glass with thicknesses of about 8 $mu@m after densification at 500$DGR@C is presented. The high thickness can be obtained by using an 80:20 mixture of methyltriethoxysilane and tetraethyl orthosilicate as alkoxide precursors in combination with an aqueous colloidal SiO$-2$/ sol with particle sizes of about 7 nm. This principle of synthesis is also applied to ZrO$-2$/ containing coatings yielding to thicknesses of about 3 $mu@m. Refractive index measurements indicate that the coatings are nearly completely densified. At higher temperatures tensile stresses appear within the layers and are transmitted to the substrate, increasing its thermal stability.
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