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Investigations of the Optical Properties of LaNi5 and LaNi4.5Sn0.5

The reflectivity, loss function, refractive index, extinction coefficient and dielectric function of the LaNi5 and LaNi4.5Sn0.5 intermetallic compounds are investigated through the plane-wave pseudo-potential method based on the density functional theory. The effects of Sn impurity are discussed and some interesting features are found in the low frequency region. Some important optical properties such as static dielectric constant and static refractive index are obtained. The equation [n (0)]2=ε1(0) is satisfied according to our calculation, which indicates that our results are correct and reasonable. Nevertheless, the calculated results need to be testified in the future due to the lack of experimental data.