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- W2477398439 abstract "Aluminum oxide crystallizes in the corundum (α-Al2O3) rhombohedral structure. It is also known as sapphire. The system is uniaxial and optical properties measured on a single crystal are, therefore, anisotropic. The structure of the oxygen sublattice is close-packed. As a result, the anisotropy of the refractive index in the visible region—related to the anisotropy of the oxygen polarizability—is small. In the millimeter-wave range, the anisotropy reaches 10%. The optical constants selected for the same are presented in this chapter. In randomly oriented materials, a reflection band necessarily develops between the two values that cancel the real part of the dielectric response. There is necessarily a maximum between two minima of the dielectric response. In single crystals, the dielectric function can be modeled. As soon as a dielectric function model fits the infrared reflectivity, the optical constants can be deduced more accurately than with a Kramers–Kronig analysis. The absorption coefficient is extremely high. The penetration depth of the infrared radiation is smaller than 1 m at a peak corresponding to a normal vibrational mode. As a result, the infrared beam in these spectral regions probes the surface of the sample rather than the bulk. In the vicinity of vibrational-mode frequencies, the results reflect bulk properties on etched surfaces or annealed crystals. Disorder or alteration of the sample surface increases mode damping and, therefore, lowers the reflectivity level. The higher the reflectivity, the better is the sample quality." @default.
- W2477398439 created "2016-08-23" @default.
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- W2477398439 date "1998-01-01" @default.
- W2477398439 modified "2023-09-27" @default.
- W2477398439 title "Aluminum Oxide (Al2O3)" @default.
- W2477398439 cites W1979009850 @default.
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- W2477398439 doi "https://doi.org/10.1016/b978-0-08-055630-7.50047-x" @default.
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