Paramagnetic defects in neutron-irradiated phenakite crystals |
| |
Authors: | V B Guseva A F Zatsepin V A Vazhenin M Yu Artyomov and A I Kukharenko |
| |
Institution: | 1.Gor’ki? Ural State University,Yekaterinburg,Russia;2.Ural State Technical University (UPI),Yekaterinburg,Russia |
| |
Abstract: | 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 O2− molecular ions with different local environments. The theoretical models of radiation-induced centers have been discussed
by comparing the EPR and optical spectroscopic data. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|