Paramagnetic defects in neutron-irradiated phenakite crystals
| Autor: | V. A. Vazhenin, M. Yu. Artyomov, V. B. Guseva, Andrey I. Kukharenko, A. F. Zatsepin |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Solid-state physics engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials Ion law.invention Crystal Crystallography Paramagnetism Nuclear magnetic resonance Phenakite law Vacancy defect engineering Electron paramagnetic resonance Hyperfine structure |
| Zdroj: | Physics of the Solid State. 52:691-699 |
| ISSN: | 1090-6460 1063-7834 |
| DOI: | 10.1134/s1063783410040049 |
| Popis: | Radiation-disordered crystals of phenakite Be2SiO4 (at fast neutron fluences of (0.75, 1.0, 1.2, 6.6, 8.5) × 1018 cm−2) have been investigated using EPR spectroscopy. It has been established that the main radiation damages predominantly occur in the silicon-oxygen sublattice of the crystal. Vacancy centers (E′ centers, g = 2.0015), defects of the displaced oxygen type, and O− hole-type centers have been revealed. The paramagnetic absorption signal with the parameters g x = 2.0218, g y = 2.0124, and g z = 2.0027 has been identified with the [SiO4]3− complex (a variety of O− centers). The intense EPR signals with the parameters g x = 2.0526, g y = 2.0020, g z = 2.0066 and g x = 2.0290, g y = 2.0030, g z = 2.0099 have been assigned to two types of O 2 − molecular ions with different local environments. The theoretical models of radiation-induced centers have been discussed by comparing the EPR and optical spectroscopic data. |
| Databáze: | OpenAIRE |
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