Dual percolation transition of an ionic conductor in the AgI–BN composite system

Nozaki, Kiyoshi; Itami, Toshio

doi:10.1088/0953-8984/16/43/015

Cited by 9 publications

(6 citation statements)

References 19 publications

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“…The inter-dendritic channel is composed of many branches and turning points, as shown in Figure 12. According to the percolation theory, obstruction of the supply of liquid Na up to the burning site at the top is realized if only some branches, for example, 17% [51][52][53][54], are blocked by Ti oxide plugs. This is the reason why a small amount of Ti nanoparticles in the LSnanop is very effective in the suppression of burning.…”

Section: The Suppression Of Reaction Of Lsnanop To Oxygenmentioning

confidence: 99%

The Promising Features of New Nano Liquid Metals—Liquid Sodium Containing Titanium Nanoparticles (LSnanop)

Itami

Saito

Ara

2015

Metals

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Abstract:A new kind of suspension liquid was developed by dispersing Ti nanoparticles (10 nm) in liquid Na, which was then determined by TEM (transmission electron microscopy) analysis. The volume fraction was estimated to be 0.0088 from the analyzed Ti concentration (2 at. %) and the densities of Ti and Na. This suspension liquid, Liquid Sodium containing nanoparticles of titanium (LSnanop), shows, despite only a small addition of Ti nanoparticles, many striking features, namely a negative deviation of 3.9% from the ideal solution for the atomic volume, an increase of 17% in surface tension, a decrease of 11% for the reaction heat to water, and the suppression of chemical reactivity to water and oxygen. The decrease in reaction heat to water seems to be derived from the existence of excess cohesive energy of LSnanop. The excess cohesive energy was discussed based on simple theoretical analyses, with particular emphasis on the screening effect. The suppression of reactivity is discussed with the relation to the decrease of heat of reaction to water or the excess cohesive energy, surface tension, the action as a plug of Ti oxide, negative adsorption on the surface of LSnanop, and percolation.

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Section: The Suppression Of Reaction Of Lsnanop To Oxygenmentioning

confidence: 99%

The Promising Features of New Nano Liquid Metals—Liquid Sodium Containing Titanium Nanoparticles (LSnanop)

Itami

Saito

Ara

2015

Metals

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“…Therefore, GEM, in which percolation threshold value and the tendency of the conductivity changes can be arbitrarily selected, was adopted to analyze the composition dependence. The GEM equation successfully simulated conductivity changes for AgIBN, 20) 23) In the present study, the proton conductivity of the percolated PAMPS-multilayer in the composite was estimated from the fitting of volume fraction dependence of conductivity using the GEM approximation. The volume fraction of the PAMPS-multilayer in the composite was controlled by the change of the PhSiO 3/2 particle diameter.…”

Section: Introductionmentioning

confidence: 95%

Estimation of interfacial proton conductivity by effective media approximation for sheet-like composite electrolyte prepared from poly(2-acrylamido-2-methyl-1-propanesulfonic acid)-deposited core-shell particles

Sakamoto

Daiko

Muto

et al. 2011

J. Ceram. Soc. Japan

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Proton conductive poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) ultrathin film was deposited as a multilayer on the size-controlled phenylsilsesquioxane (PhSiO 3/2 ) particles via layer-by-layer (LbL) assembly. The composite electrolyte prepared from the PAMPS-multilayer deposited PhSiO 3/2 had a grain boundary composed of the proton conductive multilayer. The interfacial conducting path having a honeycomb structure was percolated in the composite. The conductivity of the interfacial conducting path was estimated from general effective media (GEM) approximation. The interfacial conductivities of the composite under the conditions of 70 and 95%R.H. at 80°C were calculated from the fitting by GEM approximation to be 0.03 and 0.2 S cm ¹1, respectively.

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“…In principle the ionic system has advantages for the study of the percolation phenomena because of the freedom from the scattering or tunnelling phenomena in the boundary region, which may occur in the case of electron conduction systems. Unfortunately, the determination of s was not performed in that previous study [22] because of the too small electrical conductivity of the lower conductivity phase, BN.…”

Section: Introductionmentioning

confidence: 99%

“…Quite recently the present authors [22] studied the percolation behaviour of a composite system of the Ag + ion conductor, AgI-BN, by which two kinds of percolation behaviour were able to be studied, that is the α-AgI-BN composite system at 453 K and the β-AgI-BN composite at room temperature. The determined φ c and t for both systems were in good agreement with universal values.…”

Section: Introductionmentioning

confidence: 99%

The determination of the full set of characteristic values of percolation, percolation threshold and critical exponents for the artificial composite with ionic conduction Ag₄RbI₅–(β-AgI)

Nozaki¹,

Itami²

2006

J. Phys.: Condens. Matter

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The dc electrical conductivity, σ dc , of the composite system Ag 4 RbI 5 -(β-AgI), which is composed of a good ionic conductor and a bad one, was measured by the ac impedance method. The obtained σ dc increases with the volume fraction, φ, of the good conductor, Ag 4 RbI 5 . This φ dependence of σ dc was analysed based on the generalized effective medium (GEM) theory. The scaling law analysis was also applied. The obtained threshold value of the volume fraction, φ c , was 0.162 ± 0.005. The critical exponents, t and s, were determined to be 2.0 ± 0.05 and 0.88 ± 0.005 respectively. These values are in almost complete agreement with the universal values of φ c , t and s predicted by the computer simulation for the electrical conduction. So far as the present authors know, this study is the first to provide the full set of universal characteristic values of percolation, φ c , t and s, for the electrical conduction from a single experimental study for the artificial composite material.

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Dual percolation transition of an ionic conductor in the AgI–BN composite system

Cited by 9 publications

References 19 publications

The Promising Features of New Nano Liquid Metals—Liquid Sodium Containing Titanium Nanoparticles (LSnanop)

The Promising Features of New Nano Liquid Metals—Liquid Sodium Containing Titanium Nanoparticles (LSnanop)

Estimation of interfacial proton conductivity by effective media approximation for sheet-like composite electrolyte prepared from poly(2-acrylamido-2-methyl-1-propanesulfonic acid)-deposited core-shell particles

The determination of the full set of characteristic values of percolation, percolation threshold and critical exponents for the artificial composite with ionic conduction Ag₄RbI₅–(β-AgI)

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Dual percolation transition of an ionic conductor in the AgI–BN composite system

Cited by 9 publications

References 19 publications

The Promising Features of New Nano Liquid Metals—Liquid Sodium Containing Titanium Nanoparticles (LSnanop)

The Promising Features of New Nano Liquid Metals—Liquid Sodium Containing Titanium Nanoparticles (LSnanop)

Estimation of interfacial proton conductivity by effective media approximation for sheet-like composite electrolyte prepared from poly(2-acrylamido-2-methyl-1-propanesulfonic acid)-deposited core-shell particles

The determination of the full set of characteristic values of percolation, percolation threshold and critical exponents for the artificial composite with ionic conduction Ag4RbI5–(β-AgI)

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The determination of the full set of characteristic values of percolation, percolation threshold and critical exponents for the artificial composite with ionic conduction Ag₄RbI₅–(β-AgI)