Optical absorption spectra of as-grown and neutron-irradiated amorphous SiO2, both fused natural quartz and synthetic silica, have been analysed in the ultraviolet region below the fundamental edge. The description of the optical spectrum has been further clarified by a detailed study of the spectral components as a function of the neutron irradiation in different types of silica; we have verified known correlations between optical bands and between bands and paramagnetic centres. In 'as-grown' fused quartz samples, a previously unreported band at 6.2 eV has been detected. 'As-grown' synthetic silicas do not show any band, up to the intrinsic absorption edge. In the irradiated samples, the experimental results suggest a correlation between two bands at 5.8 and 7.1 eV, while previous attribution of the bands at 5.0 eV (B-2 band) and 7.6 eV (E band) to the same defect is discussed. The role of impurities in the optical absorption and in the radiation hardness is also considered.

Guzzi, M., Martini, M., Paleari, A., Pio, F., Vedda, A., & Azzoni, C. (1993). NEUTRON-IRRADIATION EFFECTS IN AMORPHOUS SIO2 - OPTICAL-ABSORPTION AND ELECTRON-PARAMAGNETIC-RESONANCE. JOURNAL OF PHYSICS. CONDENSED MATTER, 5(43), 8105-8116 [10.1088/0953-8984/5/43/022].

NEUTRON-IRRADIATION EFFECTS IN AMORPHOUS SIO2 - OPTICAL-ABSORPTION AND ELECTRON-PARAMAGNETIC-RESONANCE

GUZZI, MARIO;MARTINI, MARCO;PALEARI, ALBERTO MARIA FELICE;VEDDA, ANNA GRAZIELLA;
1993

Abstract

Optical absorption spectra of as-grown and neutron-irradiated amorphous SiO2, both fused natural quartz and synthetic silica, have been analysed in the ultraviolet region below the fundamental edge. The description of the optical spectrum has been further clarified by a detailed study of the spectral components as a function of the neutron irradiation in different types of silica; we have verified known correlations between optical bands and between bands and paramagnetic centres. In 'as-grown' fused quartz samples, a previously unreported band at 6.2 eV has been detected. 'As-grown' synthetic silicas do not show any band, up to the intrinsic absorption edge. In the irradiated samples, the experimental results suggest a correlation between two bands at 5.8 and 7.1 eV, while previous attribution of the bands at 5.0 eV (B-2 band) and 7.6 eV (E band) to the same defect is discussed. The role of impurities in the optical absorption and in the radiation hardness is also considered.
Articolo in rivista - Articolo scientifico
Scientifica
neurton irradiation; insulators; silica; optical absorption
English
8105
8116
12
Guzzi, M., Martini, M., Paleari, A., Pio, F., Vedda, A., & Azzoni, C. (1993). NEUTRON-IRRADIATION EFFECTS IN AMORPHOUS SIO2 - OPTICAL-ABSORPTION AND ELECTRON-PARAMAGNETIC-RESONANCE. JOURNAL OF PHYSICS. CONDENSED MATTER, 5(43), 8105-8116 [10.1088/0953-8984/5/43/022].
Guzzi, M; Martini, M; Paleari, A; Pio, F; Vedda, A; Azzoni, C
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/32284
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