OAO Fomos Materials

O. A. Buzanov

National University of Science and Technology MISiS

I. S. Didenko, N. S. Kozlova, A. P. Kozlova, E. A. Skrylyova, N. A. Siminel

The influence of isothermal annealing on the optical parameters (transmission and diffused reflection spectra) of La₃Ga_5.5Ta_0.5O₁₄ (langatate, LGT) crystals was studied. The experiment required using the polar cut {1010} samples made from crystals grown in athmospheres of argon (Ar), argon with oxygen (Ar + 0,5 % O₂) and (Ar +2 % O₂). The samples were annealed in vacuum and in air at temperatures from 500 to 1000 ^oC. Additional investigations were conducted using methods of optical microscopy, atomic force microcopy and diffused reflection spectroscopy.

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