First, I want to know if Lithium Niobate is at a default orientation of 36 degrees? I am also looking for a resource to identify their young's modulus (anisotropic) and their stress matrix.
Manufacturers offere LN in various cuts and orientations. Common are cuts among the main axis (x-cut, y-cut, z-cut), where one of the main axis is perpendicular to the surface, as much as there are special cuts like your 36° cut (which I think is optimized for certain SAW applications?) or other direction. So if you have a wafer at hand, the orientation may be any of those.
Regarding properties: A good place to start for some common values for constants is "Properties of Lithium niobate" by Wong (Ed).
Thank You Michael Rüsing. I will read it. Meanwhile, I have another connecting question. Using the BOND method we can extract relative coefficients of stress, elastic matrix, and permittivity using MATLAB code. How do we validate it?
You can validate your findings by comparison with the available literature, otherwise, you have to report your results by peer review process through a paper. Good luck
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