Stable and transient color centers in Gd3Ga5O12 crystals by A. Matkovskii, P. Potera, D. Sugak, L. Grigorjeva, D. Millers, V. Pankratov, and A. Suchocki

Crystal Research and Technology

Cryst. Res. Technol. 39, 788 (2004) - Abstract -

Stable and transient color centers in Gd₃Ga₅O₁₂ crystals

A. Matkovskii, P. Potera, D. Sugak*, L. Grigorjeva**, D. Millers**, V. Pankratov**, and A. Suchocki***

Institute of Physics, University of Rzeszow, Rzeszow, Poland
*Lviv Polytechnic National University, Lviv, Ukraine
**Institute of Solid State Physics, University of Latvia, Riga, Latvia
***Institute of Physics PAS, Warsaw, Poland

Keywords	Gd₃Ga₅O₁₂, optical absorption, color centers, γ irradaiation
PACS	61.72.Ji, 42.70.Hj, 61.80.Ed, 76.30.Mi
DOI	10.1002/crat.200310254

The work is devoted to investigation of stable color centers (CC) that are created in Gd₃Ga₅O₁₂ (GGG) crystals under irradiation with γ-quanta (E=1.25 MeV, D= 10⁵ Gy ) as well as transient CC created in the crystals under irradiation with pulsed electron beam (E=0.25 MeV, pulse duration 10 ns, fluence 10¹² cm^-2, time interval of registration 0-500 ns). On the basis of the performed study of optical absorption spectra of the as-grown and irradiated crystals it was established the correlation between a defect subsystem of as-grown crystals and a type of CC induced by radiation in the crystals. The role of Ca²⁺ dopant ions in the processes of CC formation is examined. Models of the stable and transient CC are proposed.

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