Mixed Conduction in AgCuSe

Miyatani, Shin-ya; Miura, Y.; Ando, Hirokazu

doi:10.1143/jpsj.46.1825

Cited by 21 publications

(26 citation statements)

References 7 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: 74%

“…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: 74%

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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“…The Cu 2 Se and Ag 2 Se superionic conductors form quasi-binary alloys with mixed cationic conductivity [4,5]. To these belongs CuAgSe, the rare mineral eucairite.…”

Section: Introductionmentioning

confidence: 99%

Phase transformation in CuAgSe: a DSC and electron diffraction examination

Chrissafis¹,

Vouroutzis²,

Paraskevopoulos³

et al. 2004

Journal of Alloys and Compounds

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“…At 300 K, the ZT value is ~0.05 and remains nearly constant up to the β to α transition, Tβα. Above Tβα, the ZT values of the ptype α-CuAgSe phase rapidly increases with temperature reaching ~0.55 at 700 K. Although this number is slightly lower than the value reported for bulk CuAgSe, 9 it indicates that CuAgSe NPs with promising thermoelectric performance can be fabricated easily at 300 K using a simple and rapid ion exchange reaction between Cu2Se and Ag + salt.…”

mentioning

confidence: 73%

Rapid direct conversion of Cu_2−xSe to CuAgSe nanoplatelets via ion exchange reactions at room temperature

et al. 2015

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The use of template nanostructures for the creation of photovoltaic and thermoelectric semiconductors is becoming a quickly expanding synthesis strategy. In this work we report a simple two-step process enabling the formation of ternary CuAgSe nanoplatelets with a great degree of control over the composition and shape. Starting with hexagonal nanoplatelets of cubic Cu2-xSe, ternary CuAgSe nanoplatelets were generated through a rapid ion exchange reaction at 300 K using AgNO3 solution. The Cu2-xSe nanoplatelet template and the final CuAgSe nanoplatelets were analyzed by electron microscopy and X-ray diffraction (XRD). It was found that both the low temperature pseudotetragonal and the high temperature cubic forms of CuAgSe phase were created while maintaining the morphology of the Cu2-xSe nanoplatelet template. Thermal and electronic transport measurements of hot-pressed pellets of the synthesized CuAgSe nanoplatelets showed a drastic reduction in the thermal conductivity and a sharp transition from n-type (S = -45 μV K(-1)) to p-type (S = +200 μV K(-1)) semiconducting behavior upon heating above the structural transition from the low temperature orthorhombic to the high temperature super-ionic cubic phase. This simple reaction process utilizing a template nanostructure matrix represents an energy efficient, cost-efficient, and versatile strategy to create interesting materials with lower defect density and superior thermoelectric performance.

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Mixed Conduction in AgCuSe

Cited by 21 publications

References 7 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 transformation in CuAgSe: a DSC and electron diffraction examination

Rapid direct conversion of Cu_2−xSe to CuAgSe nanoplatelets via ion exchange reactions at room temperature

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Mixed Conduction in AgCuSe

Cited by 21 publications

References 7 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 transformation in CuAgSe: a DSC and electron diffraction examination

Rapid direct conversion of Cu2−xSe to CuAgSe nanoplatelets via ion exchange reactions at room temperature

Contact Info

Product

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Rapid direct conversion of Cu_2−xSe to CuAgSe nanoplatelets via ion exchange reactions at room temperature