Optical properties of Al-8 at.% Ce alloy in liquid, amorphous and crystal states

Abstract. The optical constants of liquid, amorphous and polycrystalline Al-8 at.% Ce alloy were measured by spectroscopic ellipsometry method in the 0.52-2.7 eV spectral range. For that purpose the special installation was created. It allows one to carry out experiments up to 1600 K in vacuum 10-5 Pa or in the controllable atmosphere. Using the results obtained, disperse dependences of optical conductivity, reflective ability and functions of characteristic losses of electrons energy in this alloy were calculated. It was found, that optical properties in amorphous and polycrystalline states are determined by interband transitions. On the other hand, the essential differences in properties caused by the difference in the structure of the alloys were fixed. Two peaks of absorption in the spectra of optical conductivity of these alloys are observed. For the amorphous alloy these peaks have maxima at 1.72 eV and 0.69 eV. As for polycrystalline state, the optical conductivity curve lies higher in near IR-spectral range than for amorphous one, and the peaks of absorption are located at 1.55 eV and 1.03 eV. It is necessary to note, that for pure polycrystalline aluminum the maximum on the spectrum is at 1.5 eV. Reflective ability for liquid and amorphous states is higher, than for polycrystalline