Extended D.C. Electrical Transport Measurements on the Mixed Conductor Cu<sub>3</sub>Cs<sub>2</sub>

LeMaire, Peter K.; Benoît, Jean; Speel, Rodney

doi:10.1557/proc-500-315

Cited by 1 publication

(2 citation statements)

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“…There are various polarization techniques used in the study of mixed conductors. The one used in this work is the Yokota model 2,3 which suggests that for a small constant current density in a mixed conductor with four lead electronic probes, the voltage is given by…”

Section: Resultsmentioning

confidence: 99%

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Extended Electrical Transport Measurements on the Mixed Conductor Ag[sub 3.0]CS[sub 2]

LeMaire

Speel

Ruotolo

2001

J. Electrochem. Soc.

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Ag 3.0 CS 2 is one of a family of amorphous mixed ionic electronic conductors A x CS 2 ͑A ϭ Cu, Ag, and x between 2.8 and 4.0͒. This work extends the electrical transport measurements over a temperature range 170 to 440 K. Direct current four-probe transient methods were used to acquire voltage vs. time profiles of the material, and the ionic and electronic conductivities, and the chemical diffusion coefficients obtained following Yokota's model for mixed conductors. Differential scanning calorimetry showed phase transitions at about 411 and 451 K. Variations in the electrical transport measurements at around 400 K seem to corroborate the first phase transition. Thermogravimetric analysis shows no decomposition of the material up to about 600 K. The ionic conductivity over the entire temperature range is of the Arrhenius form, supporting hopping as the mode of ionic transport, with an activation energy of about 0.25 eV, and jump and residence times of the order of 10 Ϫ12 and 10 Ϫ8 s, respectively. The electronic conductivity results suggest possible variable range hopping between localized states, in support of earlier results obtained from the estimate of the electronic diffusion. The chemical diffusion coefficients were also of the Arrhenius form, with an activation energy of about 0.24 eV.

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Section: Resultsmentioning

confidence: 99%

“…1 This result is in contrast to that obtained for Cu x CS 2 where the mode of electron transport over a similar temperature range was by thermal activation. 3 The possibility of a phase transition is also seen at about 400 K in the electronic conductivity plots. As seen from the inset in Fig.…”

Section: Electronic Conductivitymentioning

confidence: 87%