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- W1632963669 abstract "Abstract : Point defects in lithium niobate and related electro-optic materials have been characterized using electron paramagnetic resonance (EPR), optical absorption, thermally stimulated been used to investigate a radiation-induced trapped-hole center. This new S = 1/2 defect is stable at 77 K but thermally decays near 150 K. Its EPR spectrum exhibits a complex hyperfine equally with three 93 Nb nuclei. We suggest that the hole is equally shared by a set of three equivalent oxygen ions adjacent to a cation vacancy. The photo-induced redistribution of charge has been characterized in Bi12GeO20 and Bi12SiO20 crystals. Optical excitation at 77 K converts Fe (3+) ions to Fe(2+) ions. The source of electrons (i.e., the hole traps) may be other impurities or intrinsic defects such as vacancies or anti-site cations. The intrinsic defects such as vacancies or anti-site cations. The Fe(3+) recovery during warming correlates with thermoluminescence peaks at 145, 165, and 245 K. Our results suggest that Fe(3+) ions may play an important role in the photorefractive effect in these materials. In LiTaO3, the EPR spectrum of Ta(4+) ions have been investigated. The diffusion coefficients of deuterium in single crystals of LiTaO3 have been measured by monitoring the growth of OD (-) infrared absorption bands. (AW)" @default.
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- W1632963669 date "1990-01-01" @default.
- W1632963669 modified "2023-09-28" @default.
- W1632963669 title "Photorefractive Damage Mechanisms in Electro-Optic Materials" @default.
- W1632963669 hasPublicationYear "1990" @default.
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