Chromium recharging processes in the Y3Al5O12:Mg,Cr single crystal under the reducing and oxidizing annealing influence

Sergii B. Ubizskii; Sergii S. Melnyk; Bohdan V. Padlyak; Andrej O. Matkovskii; A. Jankowska-Frydel; Zygmunt Frukacz

doi:10.1117/12.435801

10 August 2001 Chromium recharging processes in the Y₃Al₅O₁₂:Mg,Cr single crystal under the reducing and oxidizing annealing influence

Sergii B. Ubizskii, Sergii S. Melnyk, Bohdan V. Padlyak, Andrej O. Matkovskii, A. Jankowska-Frydel, Zygmunt Frukacz

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Proceedings Volume 4412, International Conference on Solid State Crystals 2000: Growth, Characterization, and Applications of Single Crystals; (2001) https://doi.org/10.1117/12.435801
Event: International Conference on Solid State Crystals 2000, 2000, Zakopane, Poland

Abstract

The influence of reducing and oxidizing annealing on optical absorption spectra of the yttrium aluminium garnet (YAG) single crystal co-doped with Mg and Cr is investigated using step-by-step isothermal and isochronous thermal treatment in H₂ or air flow. The changes in the spectral were analyzed using decomposition on elementary absorption bands of Gaussian shape. The separated absorption bands attributed to the Cr⁴⁺ ions occupying octahedral and tetrahedral sites in garnet lattice demonstrate different behavior. The analysis allows to distinguish the electronic recharging process Cr⁴⁺ $ARLR Cr³⁺ taking place in the octahedral sites of garnet lattice and having lower activation energy from the chromium migration process Cr⁴⁺ $ARLR Cr⁴⁺ happening at higher temperatures or longer exposure. Estimations show that approximately 0. 2 percent of total number of chromium ions occupied tetrahedral sites forming phototropic centers in the YAG: Mg, Cr crystal.

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Sergii B. Ubizskii, Sergii S. Melnyk, Bohdan V. Padlyak, Andrej O. Matkovskii, A. Jankowska-Frydel, and Zygmunt Frukacz "Chromium recharging processes in the Y₃Al₅O₁₂:Mg,Cr single crystal under the reducing and oxidizing annealing influence", Proc. SPIE 4412, International Conference on Solid State Crystals 2000: Growth, Characterization, and Applications of Single Crystals, (10 August 2001); https://doi.org/10.1117/12.435801

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