Ultraviolet photoluminescence from nonbridging oxygen hole centers in porous silica

2001 ◽  
Vol 78 (2) ◽  
pp. 174-176 ◽  
Author(s):  
Baodian Yao ◽  
Huazhong Shi ◽  
Xinyi Zhang ◽  
Lide Zhang
Keyword(s):  
Porous Silica ◽  
Nonbridging Oxygen ◽  
Oxygen Hole ◽  
Hole Centers

Defect Induced by Heated Treatment in Silica Fiber Material

2011 ◽  
Vol 304 ◽  
pp. 160-164
Author(s):  
Zhong Yin Xiao ◽  
Wen Yun Luo ◽  
Jian Xiang Wen ◽  
Jian Zhong Yin ◽  
Ting Yun Wang
Keyword(s):  
Thermal Treatment ◽  
Treatment Process ◽  
Defect Formation ◽  
Fiber Material ◽  
Nonbridging Oxygen ◽  
Pure Silica ◽  
Conversion Frequency ◽  
Oxygen Hole ◽  
Strained Bonds ◽  
Hole Centers

In this paper, defect induced by heated treatment in silica is studied. The formation process of defect is analyzed by the thermodynamic model. The results show that defect can be produced by thermal treatment process. The concentration of defect can be affected by many factors. The defect formation induced by heated treatment is related to the initial precursors. To pure silica glass, the precursors mainly come from the strained bonds of network. It can produce centers and nonbridging oxygen hole centers (NBOHCs). These defects are also related to the temperature of heated treatment and the conversion frequency between precursors and defects. The changes of defect concentration with temperature and conversion frequency are also discussed in detail.

The Effect of Electron Irradiation on the Structure of Sodium Aluminum-Iron Phosphate Glasses

MRS Advances ◽  
2016 ◽  
Vol 1 (63-64) ◽  
pp. 4227-4232 ◽  
Author(s):  
S.V. Stefanovsky ◽  
O.I. Stefanovsky ◽  
M.I Kadyko ◽  
V.A. Zhachkin ◽  
L.D. Bogomolova
Keyword(s):  
Room Temperature ◽  
Structural Evolution ◽  
Iron Phosphate ◽  
Esr Spectra ◽  
Phosphate Glasses ◽  
Water Molecules ◽  
Oxygen Hole ◽  
Bending Modes ◽  
Iron Phosphate Glasses ◽  
Hole Centers

ABSTRACTGlasses of the series (mol.%) 40 Na2O, (20-x) Al2O3, x Fe2O3, 40 P2O5 were irradiated with 8 MeV electrons to doses equivalent of 0.1, 0.5, and 1.0 MGy and characterized by FTIR spectroscopy and ESR at room temperature. FTIR spectra of all the glasses consist of strong bands due to O-P-O stretching modes in (PO4)3- and (P2O7)4- units at 1000-1200 cm-1, P-O-P stretching modes at 900-950 cm-1 (νas) and 700-750 cm-1 (νs), and bending modes in the PO4 units. The wavenumber range lower 800 cm-1 has some contribution due to stretching modes in MO4 and MO6 (M = Al, Fe) units. Moreover the bands at 3300-3700 cm-1 and 1550-1650 cm-1 due to stretching and bending modes in both absorbed and structurally bound H2O molecules were present. As irradiation dose increases the bands due to stretching and bending modes in water molecules and M-O-H bonds become stronger and are split. No essential changes with increasing dose were observed within the spectral range of stretching modes of the O-P-O and P-O-P bonds. Irradiation yields phosphorus-oxygen hole centers - PO42- (D5) and PO42- (D6), and PO32- ion-radicals (D2) observable in ESR spectra of low-Fe glasses. At x>5 their responses are overlapped with strong broad line due to Fe(III). On the whole, with the increase in iron content the glass structural evolution decrease.

Nonuniform distribution of oxygen hole centers in silica optical fibers

1993 ◽  
Vol 63 (25) ◽  
pp. 3440-3442 ◽  
Author(s):  
S. Kannan ◽  
M. E. Fineman ◽  
J. Li ◽  
G. H. Sigel
Keyword(s):  
Optical Fibers ◽  
Nonuniform Distribution ◽  
Oxygen Hole ◽  
Hole Centers

scholarly journals Change of silica luminescence due to fast hydrogen ion bombardment

Nukleonika ◽  
2015 ◽  
Vol 60 (2) ◽  
pp. 289-292 ◽  
Author(s):  
Vitaliy P. Zhurenko ◽  
Oganes V. Kalantaryan ◽  
Sergiy I. Kononenko
Keyword(s):  
Extended Period ◽  
Implantation Dose ◽  
Visible Range ◽  
Blue Band ◽  
Dose Accumulation ◽  
Oxygen Hole ◽  
Mathematical Processing ◽  
Luminescent Radiation ◽  
Luminescent Spectra ◽  
Hole Centers

AbstractThis paper deals with the luminescence of silica (KV-type) induced by beam of hydrogen ions with the energy of 210 keV per nucleon. An average implantation dose of up to 3.5 × 1021cm−3(5 × 1010Gy) was accumulated during irradiation over an extended period. The luminescent spectra consisted of the blue band (maximum at 456 nm) and the red band (650 nm) in the visible range. It was shown that increase in the absorption dose had an effect on the silica luminescence. It was found that the most significant changes in the spectrum occurred during the dose accumulation in the region of 550–700 nm. The shape of the spectrum of the luminescent radiation in this wavelength range was affected both by the oxygen deficient centres (blue band) and non-bridging oxygen hole centers (red band). Mathematical processing of the experimental spectra permitted to identify contributions to the luminescent radiation coming from both types of defects.

Influence of fluorine on the fiber resistance studied through the nonbridging oxygen hole center related luminescence

2013 ◽  
Vol 113 (19) ◽  
pp. 193107 ◽  
Author(s):  
L. Vaccaro ◽  
M. Cannas ◽  
S. Girard ◽  
A. Alessi ◽  
A. Morana ◽  
...  
Keyword(s):  
Nonbridging Oxygen ◽  
Hole Center ◽  
Oxygen Hole
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