Electronic and Ionic Conduction in (AgxCu1-x)2Se

Miyatani, Shin-ya

doi:10.1143/jpsj.34.423

Cited by 47 publications

(26 citation statements)

References 10 publications

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“…1a). This is in agreement with calorimetric, XRD and ionic conductivity data from the literature [1,2,5,7,9,10]. The TG curve clearly indicates an increase of the sample weight during heating in air.…”

Section: Stability Of the Samplesupporting

confidence: 91%

“…Note that diffraction results on a number of copper-and silver based halides and chalcogenides (for instance, [22,25,26]) imply that ionic conductivity can be sensitive to details of the cation redistribution between available interstitial sites vs. temperature or the stoichiometry of samples. Taking this into account, we can propose a correlation between the results of the electrochemical measurements from Miyatani et al [1,2], which revealed only a relatively modest increase in ionic conductivity with temperature within α-AgCuSe, and our diffraction results, which show no pronounced cation redistribution. The same correlation was reported for superionic fcc-Ag x Pb 1−x I 2−x with x = 1/3 and 2/3 [25].…”

Section: Structural Behaviour Of Agcuse At High Temperaturessupporting

confidence: 75%

“…Recently, the high ionic conductivity renewed the practical interest in silver copper selenide, AgCuSe. In the superionic α-phase of AgCuSe the ionic conductivity at temperatures above 473 K is as high as 1.5 Ω cm −1 [1,2]. Superionic conductors find technological applications in energy storage devices and selective gas pressure monitors.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature behaviour of average structure and vibrational density of states in the ternary superionic compound AgCuSe

et al. 2006

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Abstract.Results of simultaneous thermal analysis (STA), synchrotron powder diffraction (in the range 300-973 K) and inelastic neutron scattering (at 285 and 505 K) on non-superionic β-and superionic α-AgCuSe are reported. The sample is stable in argon on heating. The volume change at the superionic phase transition is about 5%. A model for the average structure of α-AgCuSe is proposed. No anomalies in the temperature dependence of the parameters of the average structure were revealed. Ionic conductivity in α-AgCuSe can originate from cation jumps in "skewed" 100 directions between nearest-neighbour tetrahedral sites via the peripheries of the octahedral cavities. A correlation between the temperature dependence of the cation redistribution in α-AgCuSe and the temperature dependence of the ionic conductivity is supposed. Various contributions (anharmonic effects, time-average static disorder and phononphonon scattering) to the widths of individual phonons upon temperature increase lead to pronounced changes in the neutron-weighted densities of states of β-and α-AgCuSe and accompany the superionic phase transition as well. PACS

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Section: Stability Of the Samplesupporting

confidence: 91%

Section: Structural Behaviour Of Agcuse At High Temperaturessupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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High-temperature behaviour of average structure and vibrational density of states in the ternary superionic compound AgCuSe

et al. 2006

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“…It was shown in [4] that this method gives the total ionic conductivity caused by copper and silver ions. The separation of the partial ionic conductivity was performed by means of weight and electric measurements using the cell of type (i) with the sample divided into two parts.…”

Section: Experimental Techniquementioning

confidence: 99%

Phase relations, ionic transport and diffusion in the alloys of Cu2S-Ag2S mixed conductors

Kadrgulov

Yakshibaev

Khasanov

2001

Ionics

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Abstract.Results are reported of the phase relations in the (Agx.~2Cu~.x)2 S system, ionic conductivity, self-diffusion and chemical diffusion coefficients for the solid solutions as a function of the composition x, degree of non-stoichiometry 8, and temperature in the range 473 -673 K. The extensions of the homogeneity regions for single-phases are determined. Total and partial ionic conductivity values are given for copper and silver ions for the solid solutions. Measurements ot" the self-diffusion coefficient and the correlation factors are reported. It is shown that for solid solutions that the chemical diffusion is well described in terms of the phenomenological theory of ionic transport in mixed ionic electronic conductors.

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“…The stationary potential difference Vii measured between two ionic probes of the Cu|CuBr type (contacts 3, 4 in Figure 1) at the passage of a low-density direct current through the sample (contacts 1 and 2 of the cell) makes it possible to determine the value σ i of the ionic conductivity. Under the condition that only copper ions can pass through ion filters ( Cu 4 RbCl 3 I 2 , or CuBr or CuI), and lithium ions are blocked, the applied measurement method determines the value of the total ionic conductivity accordingly to the theory developed by Miyatani [39]. Taking into account the dependence of the ion-ic conductivity, chemical diffusion coefficient, and electronic conductivity on grain sizes [35,40,41], these measurements were carried out on coarse-grained samples with an average grain size of 80-100 µm .…”

Section: Experimental Methodsmentioning

confidence: 99%

Effect of lithium doping on electrophysical and diffusion proper-ties of nonstoichiometric superionic copper selenide Cu1.75Se

Balapanov¹,

Kuterbekov²,

Kubenova³

et al. 2017

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The results of studies of the ionic conductivity and the conjugated chemical diffusion coefficients (CCDC) in the nonstoichiometric Li x Cu 1.75 Se (0 ≤ x ≤ 0.25) ternary alloys are presented. It has been observed that the values of the ionic conductivity of Cu 1.75 Se copper selenide decreases with lithium doping in general owing to increasing the the activation energy. The increasing of the conjugate chemical diffusion coefficients of the cations and electron holes was observed with increasing of lithium content, despite the decreasing of self-diffusion coefficients of the cations and decreasing of electron mobilities. The behavior of the conjugate chemical diffusion coefficients explained by a decrease in the degree of non-stoichiometry of the composition, leading to an increase of the internal electric field accelerating the motion of slower particles.

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Electronic and Ionic Conduction in (Ag_xCu_1-x)₂Se

Cited by 47 publications

References 10 publications

High-temperature behaviour of average structure and vibrational density of states in the ternary superionic compound AgCuSe

High-temperature behaviour of average structure and vibrational density of states in the ternary superionic compound AgCuSe

Phase relations, ionic transport and diffusion in the alloys of Cu2S-Ag2S mixed conductors

Effect of lithium doping on electrophysical and diffusion proper-ties of nonstoichiometric superionic copper selenide Cu1.75Se

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