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Visible to deep ultraviolet range optical absorption of electron irradiated borosilicate glass |
Wang Tie-Shan (王铁山), Duan Bing-Huang (段丙皇), Tian Feng (田丰), Peng Hai-Bo (彭海波), Chen Liang (陈亮), Zhang Li-Min (张利民), Yuan Wei (袁伟) |
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China |
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Abstract To study the room-temperature stable defects induced by electron irradiation, commercial borosilicate glasses were irradiated by 1.2 MeV electrons and then ultraviolet (UV) optical absorption (OA) spectra were measured. Two characteristic bands were revealed before irradiation, and they were attributed to silicon dangling bond (E'-center) and Fe3+ species, respectively. The existence of Fe3+ was confirmed by electron paramagnetic resonance (EPR) measurements. After irradiation, the absorption spectra revealed irradiation-induced changes, while the content of E'-center did not change in the deep ultraviolet (DUV) region. The slightly reduced OA spectra at 4.9 eV was supposed to transform Fe3+ species to Fe2+ species and this transformation leads to the appearance of 4.3 eV OA band. By calculating intensity variation, the transformation of Fe was estimated to be about 5% and the optical absorption cross section of Fe2+ species is calculated to be 2.2 times larger than that of Fe3+ species. Peroxy linkage (POL, ≡Si–O–O–Si≡), which results in a 3.7 eV OA band, is speculated not to be from Si–O bond break but from Si–O–B bond, Si–O–Al bond, or Si–O–Na bond break. The co-presence defect with POL is probably responsible for 2.9-eV OA band.
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Received: 08 October 2014
Revised: 26 January 2015
Accepted manuscript online:
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PACS:
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61.43.Fs
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(Glasses)
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61.80.Fe
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(Electron and positron radiation effects)
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Fund: Project supported by the Fundamental Research Funds for the Central Universities of China (Grant No. lzujbky-2014-16). |
Corresponding Authors:
Wang Tie-Shan
E-mail: tswang@lzu.edu.cn
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Cite this article:
Wang Tie-Shan (王铁山), Duan Bing-Huang (段丙皇), Tian Feng (田丰), Peng Hai-Bo (彭海波), Chen Liang (陈亮), Zhang Li-Min (张利民), Yuan Wei (袁伟) Visible to deep ultraviolet range optical absorption of electron irradiated borosilicate glass 2015 Chin. Phys. B 24 076102
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