Refractive Index of Nb, Niobium

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 2.827 and 2.861. 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".

  • Tab-delimited data file for unrestricted use
Wavelength (nm)

Refractive Index Reference - J. H. Weaver, D. W. Lynch, and C. G. Olson, Phys. Rev. B7, 4311 (1973)

Wikipedia: Niobium
Weaver, J. H., Lynch, D. W., Olson, C. G. (1973) "Optical Properties of Niobium from 0.1 to 36.4 eV" Phys. Rev. B 7, 4311-4318 (1973) doi: 10.1103/PhysRevB.7.4311

No guarantee of accuracy - use at your own risk.