Hi Anindya, although Lumerical has collected many often used material data in the database,there are still many that are not included. However Lumerical gives the flexibility for customers to add new materials. For ternary material please refer to https://optics.ansys.com/hc/en-us/articles/360034398514-Tips-for-creating-a-new-alloy-material
that said, you will need to find material properties (optical, electrical and thermal) by your self, either from lab measurements, or from literature.
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