Cr (Chromium)

Metals and conductors

4 datasets, together covering 0.188–61.99 µm. Default: Johnson and Christy 1974: n,k 0.188–1.937 µm.

Compare datasets

Tick datasets in the list to add them to the plot (up to 12).

Datasets

Experimental data

Models and simulations

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# Cr (Chromium): Johnson and Christy 1974: n,k 0.188–1.937 µm
cr = ls.fetch_refractiveindex("main", "Cr", "Johnson", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cr.range_nm)  # (188, 1937) nm
eps = cr.eps([633])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_85941b07b712/lightsmith"
cr = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(cr.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (cr/johnson-christy-1974).

# ... load cr as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=cr)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

Same spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).

Materials guide Open a sphere of it in Studio Quick start Ask the community

Lightsmith is open source (MIT): Mie, T-matrix, BEM, DDA, FDTD, RCWA, TMM, mode solvers and inverse design behind one spec, on CPU or GPU. GitHub.

About Cr (Chromium)

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.

Other names: Chromium

API: /v1/materials/mat_c26943acad91 · slug cr