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Niobium, also known as columbium, is the chemical element with the symbol Nb and the atomic number 41. It is a rare, soft, grey, ductile transition metal.
For a typical sample of Nb the refractive index and extinction coefficient at 632.8 nm are 2.82677 and 2.860968. Below are files of complete refractive index and extinction coefficients. If the file is not available for download, you can request our proprietary file by clicking "Request".
Refractive Index Reference - J. H. Weaver, D. W. Lynch, and C. G. Olson, Phys. Rev. B7, 4311 (1973)
No guarantee of accuracy - use at your own risk.
Tab-delimited data file for unrestricted use: