2014
DOI: 10.1016/j.saa.2014.04.073
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Voids in mixed-cation silicate glasses: Studies by positron annihilation lifetime and Fourier transform infrared spectroscopies

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Cited by 18 publications
(6 citation statements)
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“…The ceramization process reduces the intensity of the doublet responsible for the nonbridging oxygen to the level of 10%‐14% if carried out in H 2 /N 2 forming gas and even less if ceramization occurs in air (Table ). This effect correlates well with the intensity of the second component in the PAL spectra ( I 2 , Table ), which suggests that the main sites responsible for positron trapping in the investigated glasses and glass‐ceramics may be associated with nonbridging oxygen, in good agreement with Reference. Unfortunately, this contribution overlaps with the signal we expect from Ti 3+ /Ti 4+ ‐associated free volumes, making their quantification by PAL spectroscopy almost impossible.…”
Section: Resultssupporting
confidence: 77%
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“…The ceramization process reduces the intensity of the doublet responsible for the nonbridging oxygen to the level of 10%‐14% if carried out in H 2 /N 2 forming gas and even less if ceramization occurs in air (Table ). This effect correlates well with the intensity of the second component in the PAL spectra ( I 2 , Table ), which suggests that the main sites responsible for positron trapping in the investigated glasses and glass‐ceramics may be associated with nonbridging oxygen, in good agreement with Reference. Unfortunately, this contribution overlaps with the signal we expect from Ti 3+ /Ti 4+ ‐associated free volumes, making their quantification by PAL spectroscopy almost impossible.…”
Section: Resultssupporting
confidence: 77%
“…All remaining components with longer lifetimes, like (s 3 , I 3 ) in the present Ti:CMAS glasses and glass-ceramics, are associated with pick-off annihilation of ortho-positronium (o-Ps), whose lifetime depends on the size and shape of holes, giving important information on the void structure at subnanometer scale. 24 This component, however, is weak (I 3 <1%) in the investigated glasses and glass-ceramics (Table 1) as compared to other silica-based materials, 26,27 which leads to a conclusion that the size and concentration of subnanometer voids in materials of this family are not high.…”
Section: Resultsmentioning
confidence: 91%
“…18 The PALS measurements were performed at room temperature using an ORTEC spectrometer (ORTEC, Oak Ridge, USA), based on a "start-stop" method. 19,20 A spectrometer with a lifetime resolution -the full width at half maximum (FWHM) of 250 ps, monitored with a Cobalt-60 ( 60 Co) source, was used to record all the PALS spectra. Each sample consisted of 6 layers of contact lenses with a diameter of 10 mm and a thickness of 1 mm.…”
Section: Methodsmentioning
confidence: 99%
“…The PALS measurements were performed at room temperature using an ORTEC spectrometer, based on a "start-stop" method [20,21]. The spectrometer, with a lifetime resolution of FWHM = 270 ps, was monitored with a 60 Co source and was used to record all PALS spectra.…”
Section: Methodsmentioning
confidence: 99%