Refractive index database

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Optical constants of Chromium (Cr)
Rakić et al. 1998: Brendel-Bormann model; n,k 0.248–62.0 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

n_is_absolute: true
wavelength_is_vacuum: true


Fit of experimental data from several sources to Brendel-Bormann (BB) model


A. D. Rakić, A. B. Djurišic, J. M. Elazar, and M. L. Majewski. Optical properties of metallic films for vertical-cavity optoelectronic devices, Appl. Opt. 37, 5271-5283 (1998)
[Calculation script (Python)]


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Chromium, Cr

Chromium (Cr) is a hard, brittle, silver-gray metal that belongs to the transition metals group in the periodic table. It has a body-centered cubic structure and exhibits various oxidation states, but Cr(III) and Cr(VI) are the most stable and commonly observed. Chromium is best known for its role in the production of stainless steel, where it provides corrosion resistance, and in chrome plating for decorative and protective finishes. It is also used in various other alloys to improve hardness and resistance to wear. In specialized applications, chromium compounds are employed as catalysts, pigments, and tanning agents. Of particular note are its magnetic properties, which are exploited in data storage and other magnetic applications. On the environmental front, certain chromium compounds, particularly those in the hexavalent state (Cr(VI)), are highly toxic and carcinogenic, requiring strict handling and disposal protocols. Overall, chromium is an industrially significant metal with a wide range of applications, but its use is tempered by environmental and health considerations.

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