Molar volume, glass-transition temperature, and ionic conductivity of Na- and Rb-borate glasses in comparison with mixed Na–Rb borate glasses

Berkemeier, Frank; Voß, S.; Imre, Árpád W.; Mehrer, H.

doi:10.1016/j.jnoncrysol.2005.10.010

Cited by 100 publications

(60 citation statements)

References 24 publications

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“…Above x = 0.55 the increase in NaPSS content is then accompanied by a much stronger increase of σ dc and decrease of ΔH dc , respectively. The strong increase of σ dc with x is reminiscent of inorganic glasses in which the dc conductivity increases with the number density of mobile ions in a power-law fashion [40][41][42][43]. The latter finding is attributed to a strong increase in ion mobility [40].…”

Section: Conductivities Of Pecmentioning

confidence: 95%

Mechanisms of Ion Conduction in Polyelectrolyte Multilayers and Complexes

Schönhoff¹,

Imre

Bhide

et al. 2010

Zeitschrift Für Physikalische Chemie

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This paper reviews the progress made in understanding of the mechanisms of ion conduction in polyelectrolyte multilayers (PEM) and polyelectrolyte complexes (PEC). The basis are experimental conductivity data obtained by impedance spectroscopy as a function of relative humidity and temperature, respectively. Mechanically stable thin films of PEM have interesting perspectives as ion conductors, however, being prepared by self-assembly, their stoichiometry and content of ionic charge carriers is unknown. Therefore PEC act as a model material with a variable stoichiometry and known ion content.Employing poly(sodium 4-styrene sulfonate) (NaPSS) and poly(diallyldimethyl ammoniumchloride) (PDADMAC), we present conductivity spectra of dried polyelectrolyte complexes of type x NaPSS · (1 − x)PDADMAC as a function of temperature and composition, respectively. The dependence of the dc conductivity is discussed along with scaling properties of the spectra. The results show that the conductivity is always determined by the sodium ions, even in PEC with an excess of PDADMAC. The ion dynamics and transport mechanisms are, however, different in PDADMAC-rich than in NaPSS-rich PEC.PEM of different polyionic compounds are investigated in dependence on relative humidity. A general law of an exponential increase of the dc conductivity with relative humidity is found. Absolute values of the conductivity and the strength of the humidity dependence are different for different polyion materials, however, they do not depend on the type of small counterion employed in layer formation. Therefore, it is concluded that in hydrated PEM, protons are the dominant charge carriers.For both PEM and PEC we show that the MIGRATION concept developed by Funke and co-workers can be used for describing the experimental spectra over wide ranges in frequency. This implies that forward-backward hopping motions of small ions play a vital role in solid polyelectrolyte materials. Apart from these potentially successful hops, localized motions of charged particles are found to influence the conductivity spectra as well.

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Section: Conductivities Of Pecmentioning

confidence: 95%

Mechanisms of Ion Conduction in Polyelectrolyte Multilayers and Complexes

Schönhoff¹,

Imre

Bhide

et al. 2010

Zeitschrift Für Physikalische Chemie

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“…It is observed that the density decreases from 2.45 to 2.33 g cm −3 with increase in Na 2 SO 4 :Na 2 O ratio which indicates that the structure of glass samples becomes less compact. In pure sodium borate glasses density increases with increase in Na 2 O content [18]. In the present system Na 2 SO 4 replaces Na 2 O keeping the concentration of Na + ions in the glasses constant.…”

Section: Density and Molar Volumementioning

confidence: 67%

Conductivity and dielectric relaxation in sodium borosulfate glasses

Pal

Agarwal

Sanghi

et al. 2009

Journal of Alloys and Compounds

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“…15 [4,5] and serve as targets in an ion beam sputter process: An electricalneutral argon beam of well-defined energy (500 eV) and intensity (3.5 mA/cm 2 ) is focused on the glass target so that atoms are sputtered off and deposited onto a water-cooled silicon substrate, forming a thin glass layer. The layer thickness, which is controlled via the deposition time, varies between a few tens of nanometers and about 1 μm, and can be measured in situ by a quartz sensor with an accuracy of about 1 nm.…”

Section: Methodsmentioning

confidence: 99%

“…Temperature-dependent impedance spectroscopy of the target materials is obtained at slices 10 mm in diameter and 1 mm in thickness [4,5]. As shown in Figs.…”

Section: Impedance Spectroscopymentioning

confidence: 99%

Sputter-deposited network glasses

Berkemeier

Abouzari

Schmitz

2008

Ionics

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Thin films of lithium borate, sodium borate, rubidium borate, and lithium silicate glasses are prepared by ion beam sputter deposition in a thickness range between 70 and 1,400 nm. The chemical, structural, and electrical properties of the films are determined by transmission electron microscopy and impedance spectroscopy. A comparison between the thin glass layers and the corresponding bulk glasses, prepared from the melt, shows that both have similar chemical compositions and atomic short range orders. In contrast, the ionic conductivities of the borate glass films are found to be significantly increased compared to the corresponding bulk materials, while the increase depends on the chemical composition of the glasses and is not observed in the case of the silicate system. We propose a modified network structure of the sputterdeposited glass layers, namely, an increased nonbridging oxygen concentration, to be responsible for the elevated ionic conductivity.

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Molar volume, glass-transition temperature, and ionic conductivity of Na- and Rb-borate glasses in comparison with mixed Na–Rb borate glasses

Cited by 100 publications

References 24 publications

Mechanisms of Ion Conduction in Polyelectrolyte Multilayers and Complexes

Mechanisms of Ion Conduction in Polyelectrolyte Multilayers and Complexes

Conductivity and dielectric relaxation in sodium borosulfate glasses

Sputter-deposited network glasses

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