The Transport Properties of Cations in the Superionic Phase of AgxCu1-xI

Kusakabe, Masanobu; Shirakawa, Yoshiyuki; Tamaki, Shigeru; Ito, Yoshio

doi:10.1143/jpsj.64.170

J. Phys. Soc. Jpn.

1995

DOI: 10.1143/jpsj.64.170

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The Transport Properties of Cations in the Superionic Phase of Ag_xCu_1-xI

Masanobu Kusakabe

Yoshiyuki Shirakawa

Shigeru Tamaki

et al.

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Cited by 17 publications

(10 citation statements)

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“…Furthermore, the valence charges of Ag and Cu ions are almost the same [12,13]. However, the concentration dependence of E a for (AgI) 1-x (CuI) x mixtures observed in this study would not be the error, because the similar behavior has also been reported for the solid solution of AgI-CuI system [5]. As also discussed in Ref.…”

supporting

confidence: 82%

“…As also discussed in Ref. 5, the activation energy is sometimes not directly related to the ionic size and mass. Therefore, other reasons except for the size, mass, and valence charge of cations have to be considered in this case.…”

mentioning

confidence: 90%

“…for Cu-rich region) [4,5]. Although the structure and ionic conductivity of AgI-CuI solid solutions have been investigated by several scholars using experimental and simulation techniques [5][6][7], those in molten phase have not been investigated yet.In the present study, we report the ionic conductivities of molten CuI and molten (AgI) 1-x (CuI) x mixtures measured by the four-probe method, and discuss the detailed information on ionic conduction with activation energies.AgI and CuI powder samples were purchased from Wako Pure Chemical Industries. Samples of (AgI) 1-x (CuI) x (x = 0.2, 0.5, 0.8) mixtures were prepared by mixing powder materials of AgI and CuI.…”

mentioning

confidence: 99%

“…In these materials, Ag and Cu ions can migrate through the interstitial space of the sublattice formed by I ions in high temperature solid phase under the melting point [1][2][3]. It is also known that AgI-CuI mixtures form solid solutions, and both Ag and Cu ions can migrate through the anion sublattice in the high temperature superionic phase [4,5]. In the superionic phase of AgICuI mixtures, I ions form lattice, and the lattice type depends on the cationic concentration (b.c.c.…”

mentioning

confidence: 99%

“…for Ag-rich region and f.c.c. for Cu-rich region) [4,5]. Although the structure and ionic conductivity of AgI-CuI solid solutions have been investigated by several scholars using experimental and simulation techniques [5][6][7], those in molten phase have not been investigated yet.…”

mentioning

confidence: 99%

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Ionic Conductivities of Molten CuI and AgI-CuI Mixtures

et al. 2017

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Ionic conductivities σ for molten CuI and AgI-CuI mixtures were measured in the temperature ranges of approximately 580-800 and 500-850 °C, respectively. The value of σ for molten CuI in the range is smaller than that for molten CuBr and CuCl. σ for molten AgI-CuI mixtures decreases with increasing CuI-concentration. The activation energies E a for molten AgI-CuI system were determined from the analysis of temperature dependence of σ by using the by Arrhenius type equation. E a for molten AgI-CuI gradually increase with increasing CuIconcentration.AgI and CuI are well known as superionic conductors. In these materials, Ag and Cu ions can migrate through the interstitial space of the sublattice formed by I ions in high temperature solid phase under the melting point [1][2][3]. It is also known that AgI-CuI mixtures form solid solutions, and both Ag and Cu ions can migrate through the anion sublattice in the high temperature superionic phase [4,5]. In the superionic phase of AgICuI mixtures, I ions form lattice, and the lattice type depends on the cationic concentration (b.c.c. for Ag-rich region and f.c.c. for Cu-rich region) [4,5]. Although the structure and ionic conductivity of AgI-CuI solid solutions have been investigated by several scholars using experimental and simulation techniques [5][6][7], those in molten phase have not been investigated yet.In the present study, we report the ionic conductivities of molten CuI and molten (AgI) 1-x (CuI) x mixtures measured by the four-probe method, and discuss the detailed information on ionic conduction with activation energies.AgI and CuI powder samples were purchased from Wako Pure Chemical Industries. Samples of (AgI) 1-x (CuI) x (x = 0.2, 0.5, 0.8) mixtures were prepared by mixing powder materials of AgI and CuI. A mixture sample was put into an original quartz cell with 4 mm * tahara@sci.u-ryukyu.ac.jp

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supporting

confidence: 82%

mentioning

confidence: 90%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Ionic Conductivities of Molten CuI and AgI-CuI Mixtures

et al. 2017

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Atomic Disorders Induced by Silver and Magnesium Ion Migrations Favor High Thermoelectric Performance in α‐MgAgSb‐Based Materials

Zhao

et al. 2015

Adv Funct Materials

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wileyonlinelibrary.com =, where S , σ , κ , and T are the Seebeck coeffi cient, the electrical conductivity, the thermal conductivity, and the absolute temperature, respectively. Good thermoelectric materials possess the feature of "phonon glass, electron crystal." [ 1 ] The state-of-the-art strategies for improving ZT s for existing materials can generally be divided into two categories: one is to reduce the lattice thermal conductivity through nanostructuring or hierarchical architecturing; [2][3][4] the other is to enhance the electrical transport properties by resonant doping [ 5 ] or heavy band convergence. [ 6,7 ] Recently, Thermoelectric devices can directly convert thermal energy to electricity or vice versa with the effi ciency being determined by the materials' dimensionless fi gure of merit ( ZT ). Since the revival of interests in the last decades, substantial achievements have been reached in search of high-performance thermoelectric materials, especially in the high temperature regime. In the near-room-temperature regime, MgAgSb-based materials are recently obtained with ZT ≈ 0.9 at 300 K and ≈1.4 at 525 K, as well as a record high energy conversion effi ciency of 8.5%. However, the underlying mechanism responsible for the performance in this family of materials has been poorly understood. Here, based on structure refi nements, scanning transmission electron microscopy (STEM), NMR experiments, and density function theory (DFT) calculations, unique silver and magnesium ion migrations in α-MgAg 0.97 Sb 0.99 are disclosed. It is revealed that the local atomic disorders induced by concurrent ion migrations are the major origin of the low thermal conductivity and play an important role in the good ZT in MgAgSb-based materials.

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An experimental investigation of ionic transport properties in CuI–Ag2WO4 and CuI–Ag2CrO4 mixed systems

Suthanthiraraj¹,

Premchand²

2004

Journal of Solid State Chemistry

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The Transport Properties of Cations in the Superionic Phase of Ag_xCu_1-xI

Cited by 17 publications

References 13 publications

Ionic Conductivities of Molten CuI and AgI-CuI Mixtures

Ionic Conductivities of Molten CuI and AgI-CuI Mixtures

Atomic Disorders Induced by Silver and Magnesium Ion Migrations Favor High Thermoelectric Performance in α‐MgAgSb‐Based Materials

An experimental investigation of ionic transport properties in CuI–Ag2WO4 and CuI–Ag2CrO4 mixed systems

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