Hi dear friends
I've faced a problem. working on garnet-type All-Solid-State lithium-ion batteries, I carried out a Raman test on Li7La3Zr2O12 solid-state electrolyte with two different wavelengths (532nm & 785nm). surprisingly, some peaks disappeared, and some others popped up! resulting in completely different graphs. I repeated the tests, but the results were the same. Do you have any idea about the problem? I thought the peaks' location is independent from test conditions.
Thanks for your time, in advance.
Sajjad Mohammadi
With two different laser wavelengths, there can be different Raman spectra.
1. You change the wavelengths, but you also change the place where the beam falls on the crystal structure.
2. Raman spectra are complicated by fluorescence.
https://www.edinst.com/blog/lasers-for-raman-spectroscopy/
Article The Solubility and Site Preference of Fe in Li7-3xFexLa3Zr2O12 Garnets
The spectra at different wavelengths can appear different if there is a resonant enhancement of some peaks.
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