EPR of radiation centers in ion-implanted glasses simulating vitrified radioactive wastes
- Moscow State Univ. (Russian Federation). Inst. of Nuclear Physics
- SIA Radon, Moscow (Russian Federation)
EPR study of paramagnetic defects induced in borosilicate and aluminophosphate glasses simulating vitrified radioactive wastes by bombardment with heavy charge particles are studied. In order to understand the nature of interaction between heavy particles and the surface of oxide glass the authors used the particles of different mass (N, O, Ar, Mn, Cu, Pb). It is shown that two kinds of EPR spectra are induced after bombardment: the broad anisotropic spectrum with g{sub z}=2.016-2.055; g{sub y}=2.01 and g{sub x}=2.002 (A) and narrow symmetric line with g=2.0030{+-}0.0005 and linewidth 0.3-0.4 mT (S). The appearance of similar spectra in glasses of different compositions indicates these spectra belong to common for all the glasses constituent. Such constituent is oxygen, i.e. two kinds of spectra are due to oxygen-associated centers. The relationship between spectral parameters of A is characteristic of different centers: oxygen hole centers, peroxy radicals and molecular O{sub 2}{sup {minus}2} ions. The absence of hyperfine structure of EPR spectra of glasses containing cations with non-zero nuclear magnetic moments suggests that A belongs to the defects which are weakly coupled with glass network. The authors assume that Ais induced mainly by O{sub 2}{sup {minus}} molecular ions. The narrow isotropic S-signal has the maximum intensity in glasses irradiated by oxygen for all the glasses examined. However, for the majority of known oxygen-associated defects the EPR spectra are anisotropic excepting for exotic O{sub 4}{sup {minus}} ions which exhibit almost symmetric narrow line with g=ge (were ge is g-factor of free electron). The authors assume that during bombardment with heavy energetic particles the cavities which are able to accumulate large molecules are formed. Ionizing of these molecules leads to the formation of ions O{sup {minus}}, O{sub 2}{sup {minus}}, O{sub 3}{sup {minus}}, O{sub 4}{sup {minus}}, etc., whose features manifest in EPR spectra.
- OSTI ID:
- 178105
- Report Number(s):
- CONF-950917-; ISBN 0-7918-1219-7; TRN: 96:006618
- Resource Relation:
- Conference: 5. international conference on radioactive waste management and environmental remediation, Berlin (Germany), 3-9 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Fifth international conference on radioactive waste management and environmental remediation -- ICEM `95: Proceedings. Volume 1: Cross-cutting issues and management of high-level waste and spent fuel; Slate, S.; Feizollahi, F.; Creer, J. [eds.]; PB: 900 p.
- Country of Publication:
- United States
- Language:
- English
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