Ionic conductivity of Ag (GeSe3)1− (0≤x≤0.571) glasses

Kawasaki, Manabu; Kawamura, J; Nakamura, Yoshio; Aniya, Masaru

doi:10.1016/s0167-2738(99)00117-4

Cited by 68 publications

(41 citation statements)

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“…This is a clear Percolation threshold of Ag 2 Se phase embedded in Ge 0.15 Se 0.85 base is likely to be responsible for the sharp transition from semiconductive to ionic character of Se-rich Ge-Se-Ag glasses. 14,15 This reestablishes the fact that structural heterogeneity or granularity is the main criterion for ionicity in glasses.…”

Section: ͑5͒supporting

confidence: 60%

Signature of a silver phase percolation threshold in microscopically phase separated ternary Ge0.15Se0.85−xAgx (⩽x⩽0.20) glasses

Pattanayak

Asokan

2004

Journal of Applied Physics

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Temperature modulated alternating differential scanning calorimetric studies show that Se rich Ge 0.15 Se 0.85−x Ag x ͑0 ഛ x ഛ 0.20͒ glasses are microscopically phase separated, containing Ag 2 Se phases embedded in a Ge 0.15 Se 0.85 backbone. With increasing silver concentration, Ag 2 Se phase percolates in the Ge-Se matrix, with a well-defined percolation threshold at x = 0.10. A signature of this percolation transition is shown up in the thermal behavior, as the appearance of two exothermic crystallization peaks. Density, molar volume, and microhardness measurements, undertaken in the present study, also strongly support this view of percolation transition. The superionic conduction observed earlier in these glasses at higher silver proportions is likely to be connected with the silver phase percolation.

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Section: ͑5͒supporting

confidence: 60%

Signature of a silver phase percolation threshold in microscopically phase separated ternary Ge0.15Se0.85−xAgx (⩽x⩽0.20) glasses

Pattanayak

Asokan

2004

Journal of Applied Physics

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“…The interest in Ag x (GeSe 3 ) 1-x , ternary alloy based on chalcogenide glass, stems from the extensive compositional range of bulk glass forming [1], and from the rapid enhancement in ionic conductivity from 10 -14 to 10 -4 S/cm of these glasses at Ag concentration of x=0.3 with increasing Ag content [2].…”

Section: Introductionmentioning

confidence: 99%

Local Structure of Superionic Glass Ag_x(GeSe₃)_1-x,x=0.565

Kumara

Ohara

Kawakita

et al. 2011

EPJ Web of Conferences

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Abstract. To investigate relation between inhomogeneous structure of Ag x (GeSe 3 ) 1-x superionic glass and conduction path formation, x-ray diffraction, neutron diffraction and EXAFS measurements on K-edges for each constituent were performed. Reverse Monte Carlo structural modelling based on these experimental data revealed that Ag conduction paths are formed in random glass media of GeSe 4 tetrahedral network. The first sharp diffraction peak (FSDP) located at 1.1 Å -1 is mainly contributed by GeSe 4 network, while an observed intense small angle scattering is contributed also by Ag-Ag as well as GeSe 4 network.

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“…Amorphous Ag-Ge-Se system has a wide range of compositional region where amorphous state can be easily obtained by water or even air quenching 2) . Kawasaki et al 3) reported a large jump in ionic conductivity at the composition around x = 0.3 for Ag x (GeSe 3 ) 1-x , which may support a percolation threshold of the conducting path behavior in the glassy network. 4,5) Recently Naoaki Kuwata et al 6) observed, by scanning electron microscopy, micro phase-separation in Ag x (GeSe 3 ) 1-x system at room temperature between GeSe 3 almost not including Ag ions and Ag x (GeSe 3 ) 1-x with Ag-rich composition of x ~ 0.565.…”

Section: Introductionmentioning

confidence: 90%

“…Superionic glasses of high ionic conductivity, 10 -6 -10 -2 S/cm, could be one of the candidates of such electrolytes 1) . It is well known that, in glasses including Ag, superionic behavior of Ag ions realizes at lower temperature compared with crystalline superionic materials such as AgI and Ag 2 Se 2,3) . Amorphous Ag-Ge-Se system has a wide range of compositional region where amorphous state can be easily obtained by water or even air quenching 2) .…”

Section: Introductionmentioning

confidence: 99%

Structural Study of Ag–Ge–Se Superionic Glass

et al. 2010

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Structural analysis of superionic glass Ag 0.5 (GeSe 3 ) 0.5 and in its molten state was performed by high-energy x-ray diffraction and neutron diffraction measurements at 110 and 300 K for the amorphous, 503 K for the supercooled-liquid state and 1223 K for molten state. Three-dimensional structural model at each temperature was obtained by means of reverse Monte Carlo (RMC) structural modelling on the basis of both diffraction data at 110 and 300K and X-ray data at 503 and 1223 K. It was revealed that the Ag distribution in Ag 0.5 (GeSe 3 ) 0.5 glass has a tendency to form chain-like fragments even in the molten state. With decreasing temperature from the molten state, medium-range order as well as local order appears with extended large fluctuations in Ag distribution.

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Ionic conductivity of Ag (GeSe3)1− (0≤x≤0.571) glasses

Cited by 68 publications

References 50 publications

Signature of a silver phase percolation threshold in microscopically phase separated ternary Ge0.15Se0.85−xAgx (⩽x⩽0.20) glasses

Signature of a silver phase percolation threshold in microscopically phase separated ternary Ge0.15Se0.85−xAgx (⩽x⩽0.20) glasses

Local Structure of Superionic Glass Ag_x(GeSe₃)_1-x,x=0.565

Structural Study of Ag–Ge–Se Superionic Glass

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Ionic conductivity of Ag (GeSe3)1− (0≤x≤0.571) glasses

Cited by 68 publications

References 50 publications

Signature of a silver phase percolation threshold in microscopically phase separated ternary Ge0.15Se0.85−xAgx (⩽x⩽0.20) glasses

Signature of a silver phase percolation threshold in microscopically phase separated ternary Ge0.15Se0.85−xAgx (⩽x⩽0.20) glasses

Local Structure of Superionic Glass Agx(GeSe3)1-x,x=0.565

Structural Study of Ag–Ge–Se Superionic Glass

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Local Structure of Superionic Glass Ag_x(GeSe₃)_1-x,x=0.565