On the formation of radiation-induced defects in fluoroaluminate glasses

Богомолова, Л.Д.; Teplyakov, Yu.G.; Jachkin, V.A.; Prushinsky, S.A.; Богданов, В. Л.; Khalilev, V. D.; Caccavale, F.; LoRusso, Stephen

doi:10.1016/0925-3467(95)00069-0

Cited by 18 publications

(6 citation statements)

References 17 publications

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“…5 (curves 1'-3') that, with an increase in the dopant concentration, the intensity of 0.71 ± 0.08 * According to the terminology used in [30]. ** From the estimates made in [14].…”

Section: Resultsmentioning

confidence: 99%

A model of the capture volume of free carriers in fluorophosphate glasses doped with terbium

Bocharova

2005

Glass Phys Chem

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INTRODUCTIONThe particular interest expressed by researchers in the study of the behavior of rare-earth ions in glassforming matrices has stemmed, to a large extent, from new possibilities offered by optical fiber amplifiers based on Er 3+ , Pr 3+ , and Nd 3+ ions [1,2]. Until recently, many attempts have been made to elucidate the nearest environment of dopant ions and to determine their spatial distribution in different matrices [3][4][5]. In our opinion, investigation into the properties of fluorophosphate and fluoride glasses doped with rare-earth ions holds the greatest interest today. This is associated with the unique spectroscopic properties exhibited by rare-earth ions in these matrices (specifically with the high efficiency of excitation energy transfer from Yb 3+ ions to Er 3+ ions as compared to silicate and borate matrices [6,7]), on the one hand, and with the low energy of phonons in the fluoride matrix (which makes it promising for use in fabricating fibers with low losses in the IR range [1, 2]), on the other hand.Traditionally, the local environment of dopant ions has been examined using spectroscopic methods, including the study of luminescence spectra, luminescence decay kinetics, and IR absorption spectra. In particular, Hiroyuku et al. [8] investigated the Eu 3+ luminescence spectra of fluoroaluminate and fluorophosphate glasses (containing 1 mol % EuF 3 ) at 80 K and revealed that the nearest environment of Eu 3+ ions involves oxygen. Kolobkov et al. [9] refined the dependence of the local environment of rare-earth ions in glasses of the MgF 2 -(0.6CaF 2 + 0.4AlF 3 )-Ba(PO 3 ) 2 system on the content of the fluoride component in the initial matrix. In [9], the authors analyzed the Eu 3+ and Nd 3+ luminescence spectra and nonradiative nonresonant energy transfer between Er 3+ and Ho 3+ ions and established that, in fluorophosphate glasses containing up to 40-50 mol % of fluorides, the nearest environment of rare-earth ions is predominantly formed by phosphate groupings. In this case, the dopant content was equal to 1 wt % (5 wt % for Eu 2 O 3 ). More recently, Zhmyreva et al.[10] studied the vibronic and Raman spectra of doped glasses in systems with a similar composition (the Eu 2 O 3 content was 5 wt %). It was shown that the presence of fluorophosphate groups in the vicinity of rare-earth ions manifests itself in the spectral characteristics of glasses containing 30 and 10 mol % of barium metaphosphate and that, at a higher barium metaphosphate content, the dopant ions are incorporated into regions in the immediate vicinity of the phosphate structural units of the glass network. Karapetyan et al. [11] observed the concentration quenching of neodymium luminescence in glasses of the MgCaSrBaAl 2 F 14 -Ba(PO 3 ) 2 pseudobinary system. It was found that the concentration quenching limits for glasses containing 60 and 7 mol % Ba(PO 3 ) 2 are equal to 2 × 10 20 and 1 × 10 20 ions cm -3 , respectively. Comparison of the results obtained with the data on the absorption spectra allowed those aut...

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“…5 (curves 1'-3') that, with an increase in the dopant concentration, the intensity of 0.71 ± 0.08 * According to the terminology used in [30]. ** From the estimates made in [14].…”

Section: Resultsmentioning

confidence: 99%

A model of the capture volume of free carriers in fluorophosphate glasses doped with terbium

Bocharova

2005

Glass Phys Chem

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“…The unique inference cannot be made, because the recorded EPR spectrum of glasses 9 and 10 is an intense signal with a g factor of 2.016 and the linewidth ∆H ≈ 65 G (the so-called CR line) [35]. According to the analysis performed in [13, 31,35], the parameters of the recorded spectrum correspond to a superposition of signals from defects with structures involving fluorine and oxygen and also from molecular ions. The contribution of the third signal to the superposition of the EPR absorption signals cannot be revealed.…”

Section: Discussionmentioning

confidence: 99%

Effect of Gamma Radiation on Optical and EPR Absorption Spectra of Phosphate and Fluoride Glasses Containing Lead

Bocharova

Karapetyan

2005

Glass Phys Chem

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The induced optical and EPR absorption spectra of phosphate and fluoride glasses containing lead are investigated. It is revealed that exposure to gamma radiation leads to the formation of radiation-induced defects responsible for the induced absorption band with a maximum at 12500-13500 cm -1 and the EPR signal in the form of an almost symmetric line with a g factor of 1.999 and a linewidth of ≈ 26 Oe. Analysis of the intensities of the absorption bands and the EPR signals in the spectra of glasses with low terbium, tin, and carbon contents and the study of their thermal bleaching demonstrate that the color centers are electron traps, whereas the paramagnetic centers are hole-trapping centers. Examination of the change in the parameters of the absorption bands in the spectra of glasses with different R 2 O contents ( R = Na, K, Rb, Cs) makes it possible to determine the location of the color centers associated with the Pb + ions in the structure. It is established that the glasses under investigation are characterized by the nonlinear absorption of radiation at a wavelength of 1.06 µ m. The mechanism of formation of radiation-induced defects is considered.

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“…Especially, metal fluoride glasses based on GaF 3 , A1F 3 , ZnF 2 , InF 3 etc., which present a high optical transparency in the mid-infrared, have been extensively applied in optical sensors, fiber laser, optical amplifier, optical fibers [5][6][7], etc. Nowadays, it is important and interesting thing to investigate the compound and local lattice distortion structure of fluoride glasses by EPR using Fe 3 + and Cr 3 + probes.…”

Section: Introductionmentioning

confidence: 99%

Theoretical studies of the optical and EPR spectra for Fe3+ ion in the MF3:Fe3+ (M=Al, Ga) systems

Kuang

Mao

2010

Journal of Luminescence

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On the formation of radiation-induced defects in fluoroaluminate glasses

Cited by 18 publications

References 17 publications

A model of the capture volume of free carriers in fluorophosphate glasses doped with terbium

A model of the capture volume of free carriers in fluorophosphate glasses doped with terbium

Effect of Gamma Radiation on Optical and EPR Absorption Spectra of Phosphate and Fluoride Glasses Containing Lead

Theoretical studies of the optical and EPR spectra for Fe3+ ion in the MF3:Fe3+ (M=Al, Ga) systems

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