Crystal Research and Technology
Cryst. Res. Technol. 34 (1999) 729 - Abstract -

S.M. Kaczmarek, R. Jablonski*, I. Pracka*, M. Swirkowicz*, J. Wojtkowska**, S. Warchol***

Military University of Technology Warsaw
*Institute of Electronic Materials Technology Warsaw
**Soltan Institute of Nuclear Studies, Swierk
***Institute of Nuclear Chemistry and Technology Warsaw, Poland

Radiation Defects in LiNbO3 Single Crystals Doped with Cr3+ Ions

Absorption and additional absorption of LiNbO3 crystals doped with Cr3+ during growth or by diffusion process were investigated before and after γ-irradiation with a dose of 105 Gy and also before and after proton irradiation with a fluency of 1014 cm-2. It was found that chromium ions may be introduced into LiNbO3 crystals also as Cr2+. ESR measurements of Cr:LiNbO3 crystals irradiated by γ-rays and electrons were performed. Paramagnetic peak after γ and electron irradiation was observed, which vanishes after annealing at 400°C for 3h both in optical and ESR spectra. Mn2+ lines were also observed, which diminish after electron irradiation only.

Keywords: gamma, proton and electron irradiations; additional absorption; electron spin resonance; radiation defects; chromium valency


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