In my 3D printing of zirconia research, I have found a common trend to be an increase of transmittance (%) with increasing wavelength for my sintered samples. I have attached one example plot of this. The zirconia is tetragonal phase and has around 3mol% of yttria.
The samples are thin, maybe 0.5mm or less. The test performed is UV-Vis. There is a sharp increase around 360-420 nm and then has a small slope slightly increasing until 850 nm.
Why might I see this trend in my samples?
Because refractive index (n) and extinction coefficient (k) decrease with increasing incident light wavelength, in general.
The sharp transmittance increase in your sample around wavelength of 360-420 nm is the most probably caused by sharp decrease of n and k, i.e. your sample absorbs less light in this region. Quite normal behaviour.
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