Electrical transport properties of new ZrF4-based glasses

Ravaine, D.; Leroy, D. B.

doi:10.1016/0022-3093(80)90498-6

Cited by 29 publications

(7 citation statements)

References 8 publications

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“…Quelques électrolytes vitreux moins courants, et aussi moins conducteurs, présentent une conduction anionique. C'est le cas de verres à base de fluorures ou de silicates contenant des halogénures de plomb, conducteurs par les anions halogénures [2] [3].…”

Section: Conduction Ionique : Les Faits Experimentauxunclassified

Thermodynamique des porteurs de charges dans les verres à conduction ionique

Souquet

Coppo

1992

J. Phys. IV France

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Ionic conductivity in plasses is mainly cationic, singly charged cation leading to the highest conductivities. Despite a large variety of chemical compositions (oxide or chalcogenide glasses) and a very large spread for room temperature conductivity (over 6 orders of magnitude) al1 glasses present important similarities. Below their vitreous transition temperature Tg, ionic conductivity is an activated process 0 = o0 exp (-E,/RT) and isothermal conductivity variations with composition are mainly the result of the activation energy variations (E,) since dl the extrapolated values of conductivity when T tends to infinity (a,) are within only one or two orders of magnitude. This behaviour is explained assurning an ionic displacement due to interstitial pairs in very low concentration. Interstitial pairs formation and migration are activated mechanisms and both contribute to the measured activation energy for ionic conduction. The usual approach developed by physicists for defect formation in ionic crystals explains very simply the similar values obtained for 0, but not the E , variations with composition. The dissociation theory, more familiar to chemists, completes this approach and links o0 and E, to partial entropy and enthalpy of the alkali salts dissolved in the glassy matrix. From these relationships conductivity variations with composition or quenching rate are interpreted.

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Section: Conduction Ionique : Les Faits Experimentauxunclassified

Thermodynamique des porteurs de charges dans les verres à conduction ionique

Souquet

Coppo

1992

J. Phys. IV France

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“…In the ZBLAN glasses, non-bridging fluoride ions are the dominant charge carriers [9]. The glasses seemed to be prospective as vitreous solid electrolytes due to their highly coordinated cations and highly polarizable modifiers.…”

Section: Zblan Glassesmentioning

confidence: 99%

“…As heavy metal fluorides are usually good fluoride ion conductors [7,8], heavy metal fluoride glasses and fibers based on ZrF4, PbF 2 or ZnF 2 are prospective materials also for a development of glassy superionics and of superionic fibers [9][10][11]. The preparation of glassy fluoride superionics is technologically more simple and cheaper NaF ZBA 62 33 ---5 ---ZBLA 57 34 5 4 ---ZBLAN4 55 31 5 5 4 ZBLAN7 57 30 3 3 7 ZBLAN20 53 20 4 3 20 ZBISN30 30 20 10 l 0 ---30 ZBISN40 40 20 10 10 ---20 ZBISAN50 50 10 10 10 10 10 than the preparation of fluoride single crystals or ceramics.…”

Section: Introductionmentioning

confidence: 99%

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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“…Since fluorozirconate glasses were discovered by Poulain et al [1] in 1975, these glasses have attracted considerable attention owing to their possible applications as device materials. Fluorozirconate glasses exhibit remarkably high ionic conductivity [2,3], good optical transparency, and the ability to contain a large amount of additives, such as rare-earth ions, which are important for applications in optically active devices. Although the static structures of these glasses are rather well understood [4], the mechanism of the ionic conduction is not yet understood very well.…”

Section: Introductionmentioning

confidence: 99%

Computer simulation of ionic conduction in glass: II. Normal-mode analysis

Yamamoto

Kano

Kawamoto

1997

J. Phys.: Condens. Matter

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Ionic conduction in ZrF 4 -BaF 2 glass is investigated using normal-mode analysis (NMA). The origin of two distinct timescales observed in an earlier nuclear magnetic resonance (NMR) study (Y Kawamoto and J Fujiwara 1990 Phys. Chem. Glasses 31 117) is considered. First, it is shown that the present NMA gives a result that is satisfactorily consistent with molecular dynamics (MD) simulations. This indicates that the NMA method could be successfully applied to the present topic, as well as providing added support to the MD result. The two methods give a consistent explanation for the origin of the NMR observation; the fact that there are two timescales is attributable to the difference in mobility between two classes of fluoride ions, i.e., bridging fluoride (BF) and non-bridging fluoride (NBF). The present NMA also provides information additional to that from the MD results. The difference in mobility between BF and NBF becomes significant only below the glass transition temperature T g . Further analysis has been made to characterize the conduction mechanism more clearly, by the use of normal-mode excitations. The main finding is that an activation process becomes important for BF conduction below T g , whereas no such process is observed for NBF.

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Electrical transport properties of new ZrF4-based glasses

Cited by 29 publications

References 8 publications

Thermodynamique des porteurs de charges dans les verres à conduction ionique

Thermodynamique des porteurs de charges dans les verres à conduction ionique

Physical properties of multicomponent fluoride glasses for photonic and superionic applications

Computer simulation of ionic conduction in glass: II. Normal-mode analysis

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