???TiN, Titanium nitride
Titanium nitride (TiN) is an extremely hard ceramic material, often used as a coating on titanium alloys, steel, carbide, and aluminium components to improve the substrate's surface properties.
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Refractive Index Reference - J. Pfl¨¹ger, J. Fink, W. Weber, and K.P. Bohnenn, Phys. Rev. B 30, 1155 (1984)
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