Cerium/aluminum correlation in aluminosilicate glasses and optical silica fiber preforms

Systematic investigation of composition effects on the radiation-induced attenuation mechanisms of aluminosilicate, Yb-doped silicate, Yb- and Yb,Ce-doped aluminosilicate fiber preforms [Invited]

“…Given that irradiation leads to a large loss of Ce 3+ ions, the reduction of native Ce 4+ into Ce 3+ ions by electron trapping must be much less efficient than the destruction of Ce 3+ . This is by the way consistent with the fact that Ce 3+ ions are expected to be much more abundant than Ce 4+ ions in pristine aluminosilicate glasses, even in MCVD samples [45]. The minority process during irradiation, namely the creation of Ce 3+ ions by electron trapping at Ce 4+ ions, cannot become responsible for the dominant Ce 3+ restoration process reflected by the VIS TSL (electron detrapping and recombination at Ce 3++ ions).…”

“…In Yb,Ce-co-doped aluminosilicate glasses, Ce can be present under the form of both Ce 3+ and Ce 4+ ions [44]. It was however demonstrated recently that the trivalent form is substantially prevalent (at least 85%) in preforms containing similar concentrations of Al as ours, although these preforms were also made in the oxidizing conditions of MCVD [45]. The pristine attenuation of the AS:Yb,Ce sample of Fig.…”

“…What matters is determining whether this emission is due to the restoration of the VIS emission bands from Si-or Al-ODCs (at 470 nm (2.7 eV) and 405 nm (3.1 eV)) respectively, since they were previously shown to be suppressed by the introduction of Yb, or if it relates to Ce 3+ ions. PL characterizations of Ce-doped MCVD preforms brought out a Ce 3+ emission band around 400 nm (3.1 eV) for Al-containing samples [45]. In addition, XRL measurements conducted on Al-free Ce-doped sol-gel silica glasses revealed a composite Ce 3+ emission made of two overlapping bands, one around 2.7 eV and the other around 3 eV [46].…”

“…Obviously, the negative RIA above 3.7 eV is also due to Ce. If Ce 4+ ions only represent a small fraction of Ce ions in the glass [45], it most likely reflects a massive loss of Ce 3+ ions. The deficit of AlOHCs related to the disappearance of Ce 3+ ions is a priori consistent with the standard vision of the role of Ce: trivalent ions may have disappeared by capturing holes, thus competing with AlOHC precursors.…”

Effect of TiO2 and 11 minor elements on the reactivity of ground‐granulated blast‐furnace slag in blended cements

“…Some elements, however, can be present in multiple sites and oxidation states in the glass. [47][48][49] To be able to estimate the effect of a certain addition on GGBS reactivity in blended cements, an index based on field strength of the element and the added amount is suggested here. The field strength of Mg was chosen to be used as a cutoff value between positive and negative impact of an addition.…”