Local structures of rare-earth ions in glasses: the ‘crystal-chemistry’ approach

Wang, J.; Brocklesby, W.S.; Lincoln, John R.; Townsend, J.E.; Payne, D.N.

doi:10.1016/0022-3093(93)91303-k

Cited by 96 publications

(49 citation statements)

References 28 publications

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“…However, we need to keep in mind that different rare earth ions can behave quite differently due to their different ionic radii resulting from the well known lanthanide contraction effect [1,45]. The ionic radius of lanthanum is around 1.18 Å while that of erbium ions is around 0.88 Å [45], resulting in a 20% different in ionic strength. Much higher ionic strength of erbium ions suggests a higher tendency of clustering.…”

Section: Discussionmentioning

confidence: 99%

The structure of erbium doped sodium silicate glasses

Cormack

2005

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 99%

The structure of erbium doped sodium silicate glasses

Cormack

2005

Journal of Non-Crystalline Solids

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“…Sen 70) performed EXAFS spectroscopy on NdAl-codoped SiO 2 glass, and revealed that the oxygen coordination number of the Al was 4, and the AlO distance was 1.761.77 ¡. Monteil et al 71 72) proposed that the oxygen coordination number of Al should be 6 based on the coordination in alkali-free aluminosilicate crystals and glasses. 73),74) Saitoh et al 75) elucidated the local structure around an Er 3+ ion using electron spin echo envelope modulation (ESEEM) spectroscopy.…”

Section: Mechanism Of Codoping Effectmentioning

confidence: 99%

Doping effects in amorphous oxides

Funabiki

Kamiya

Hosono

2012

J. Ceram. Soc. Japan

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Impurity doping of crystalline Si is one of the most striking techniques in semiconductor technology. A rigid and perfect crystalline lattice is prerequisite for effective doping. However, it has been reported to date that introducing a small amount of impurities drastically improves also the properties of amorphous materials. This paper reviews three pronounced doping effects on optical and electrical properties of amorphous oxides; i.e., (i) F-doping of silica glass to improve the vacuum-ultraviolet optical transmission and radiation toughness, (ii) codoping effects on solubility enhancement of rare earth ions in silica glass melt, and (iii) electron-carrier generation in transparent amorphous oxide semiconductors. It is emphasized that effectiveness of electron doping is determined by the magnitude of electron affinity and stabilization energy of a dopant. Importance of the local structure formed around a dopant ion and the location of conduction band minimum measured from the vacuum level is addressed to understand the doping effects in amorphous oxides.

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“…Large Pb 2+ and Ba 2+ ions are modifiers, which create nonbridging fluoride ions and enhance the fluoride-ion conductivity [12]. EXAFS studies of the near neighborhood of modifiers in silicate [21] and fluoride [22] glasses showed that channels filled with modifiers are formed in the glassforming network. These channels have a distinct composition, structure and properties.…”

Section: Pibal Glassesmentioning

confidence: 97%

Physical properties of multicomponent fluoride glasses for photonic and superionic applications

Trnovcová

Zakalyukin

Сорокин

et al. 2001

Ionics

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Abstract. Heavy metal fluoride glasses are promising materials for ultra-low loss mid-infrared optical fibers. The fibers are applied in remote spectroscopy, laser surgery, and thermal imaging. Upon doping with rare earth ions, heavy metal fluoride fibers are suitable for a development of high power laser materials, up-conversion lasers, and optical amplifiers for telecommunications systems. As heavy metal fluorides are prospective fast fluoride ion conductors, fluoride glasses based on ZrF4, BaF2, LaF3, AIF3 and NaF (ZBLAN), PbF2, InF3, BaF2, A1F3, LaF3 (PIBAL) or ZnF2, BaF2, InF3, SrF2, A1F3, NaF (ZBISAN) are interesting for a development of glassy or fibrous ionic conductors. In this paper, the ionic conductivity and dielectric response of the abovementioned multicomponent fluoride glasses is studied. The influence of the glass composition on the glass transition temperature (Tg) and on the crystallization temperature (Tcr) is also reported. The optimum composition and drawing temperature for fluoride glass fibers is specified. IntroductionAt first, fluorozirconate glasses were studied from the point of view of ultra-low mid-infrared optical loss [1] and optical fiber preparation [2]. A need of ultra-low-loss fibers for the long-distance telecommunications system was the driving force for a development of heavy metal oxide, fluoride and chalcogenide glass fibers. Because of a significant shift of the multiphonon edge, in comparison to silicate glasses, fluoride glass fibers have a low-loss window at 2.13 -2.55 ~tm, with a theoretical intrinsic loss minimum which is lower than 10 2 dB/km. Both the absorption by impurities and the extrinsic scattering by local inhomogeneities result in the actual intrinsic loss minimum of about 0.45 dB/km, at 2.35 gm [3]. Therefore, the infrared fluoride fibers are mostly applied in remote spectroscopy, laser surgery and thermal imaging [4].

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Local structures of rare-earth ions in glasses: the ‘crystal-chemistry’ approach

Cited by 96 publications

References 28 publications

The structure of erbium doped sodium silicate glasses

The structure of erbium doped sodium silicate glasses

Doping effects in amorphous oxides

Physical properties of multicomponent fluoride glasses for photonic and superionic applications

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