The compound is a very hard material that has a Wurtzite crystal structure. For a typical sample of GaN the refractive index and extinction coefficient at 632.8 nm are 2.37966 and 0. Below are files of complete refractive index and extinction coefficients. GaN, Wurtzite. Refractive index n versus wavelength on sapphire at 300 K Yu et al. (1997) GaN, Wurtzite sructure. Long-wavelength refractive index normalized to the 0 K value vs. GaN, Wurtzite. Reflectance R as a function of photon energy for single crystals (platelets). T = 2 K Dingle et al. (1971) GaN, Wurtzite.
Option A: see RefractiveIndex.INFO
Option B: If you have access, see the article
http://dx.doi.org/10.1016/S0022-3697(96)00219-3
which has both theoretical and experimental data. It depends onfrequency, of course, and also whether you're talking aboutzincblende or wurtzite GaN. For wurtzite, it also depends ondirection.
If I'm reading Figure 4 correctly, the zero-frequency index ofrefraction is supposed to vary between about 2.25 and 2.4,depending on structure and direction.
The article is from 1996, so presumably there are newer, betterpapers since then.
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Option A: see RefractiveIndex.INFO
Option B: If you have access, see the article
http://dx.doi.org/10.1016/S0022-3697(96)00219-3
which has both theoretical and experimental data. It depends onfrequency, of course, and also whether you're talking aboutzincblende or wurtzite GaN. For wurtzite, it also depends ondirection.
If I'm reading Figure 4 correctly, the zero-frequency index ofrefraction is supposed to vary between about 2.25 and 2.4,depending on structure and direction.
The article is from 1996, so presumably there are newer, betterpapers since then.