Extended D.C. Electrical Transport Measurements on the Mixed Conductor Cu3Cs2

1997 ◽  
Vol 500 ◽  
Author(s):  
P. K. Lemaire ◽  
J. Benoit ◽  
R. Speel
Keyword(s):  
Ionic Conductivity ◽  
Electrical Transport ◽  
Electronic Conductivity ◽  
Ionic Transport ◽  
Mixed Conductor ◽  
Chemical Diffusion Coefficient ◽  
Mixed Conductors ◽  
Voltage Versus ◽  
Temperature Range ◽  
Transport Measurements

ABSTRACTD.C. electrical transport measurements have been done over the temperature range 200 K. to 450 K on the mixed conductor Cu3.0CS2 This work extends the original work done on CuxCS2 over the temperature range 260 K to 350 K. Above 220 K, the voltage versus time curves follow the Yokota model for mixed conductors. Below 220K, the voltage versus time curves were practically constant, suggesting very little ionic transport below this temperature, and an electronic conductivity of the order of 10−5 (Ω cm)−1 at 200 K. At ambient temperatures, the ionic conductivity and electronic conductivity were both of the order of 10−3 (Ω cm)−1, and the chemical diffusion coefficient found to be of the order of 10−6 cm2s−1, in agreement with earlier work on Cu3CS2. Above 220 K, the ionic conductivity versus temperature plots were of the Arrhenius form with an activation energy of about 0.36 eV. The jump time and residence time were estimated to be of the order of 10−12s and 10−6s respectively, confirming hopping as the mode of ionic transport. The electronic conductivity versus temperature plot confirmed thermal activation as the mode of electronic transport. The results suggest CuxCS2 to be very stable and the Yokota model, with very little modification, to be very reliable for the analysis of these mixed conductors.

Mixed Conductors: Synthesis, Properties, Applications

MRS Bulletin ◽  
1989 ◽  
Vol 14 (9) ◽  
pp. 31-38 ◽  
Author(s):  
M. Stanley Whittingham
Keyword(s):  
Ionic Conductivity ◽  
Solid Electrolytes ◽  
Structural Changes ◽  
Electronic Conductivity ◽  
Electron System ◽  
Inorganic Materials ◽  
Mixed Conductors ◽  
Delocalized Electron ◽  
Synthesis Properties ◽  
Fixed Composition

Only in the last two decades has the full realization been made that many materials can incorporate atoms or ions into their structures around room temperature. This incorporation frequently occurs with minimal structural changes so that the reaction can be reversed by appropriate chemical or electrical means. These materials include metals, inorganics, and organics. The driving force for reaction is a gain in free energy and is frequently associated with a transfer of electron density between the guest and host species. Thus by definition the host material must contain an electronic structure that can be readily oxidized or reduced, and hence for inorganic materials normally contains transition metals with their variable valences, or for organics a delocalized electron system.The systems described here frequently exhibit both electronic and ionic conductivity, i.e., they are mixed conductors over at least part of their composition range. They tend to have variable composition; this contrasts with solid electrolytes such as β-alumina which may also be nonstoichiometric but are of fixed composition at normal temperatures. Materials in this last category include the β-aluminas and aluminosilicates such as vermiculite and montmorillonite, both of which can be used as electrolytes due to their high ionic conductivity and low electronic conductivity.

Chemical Diffusion in Mixed Conductors with Comparable Ionic and Electronic Transport Numbers: Results for Ag1.92Te

1996 ◽  
Vol 453 ◽  
Author(s):  
W. Preis ◽  
W. Sitte
Keyword(s):  
Diffusion Coefficient ◽  
Electronic Transport ◽  
Chemical Diffusion ◽  
Mixed Conductor ◽  
Chemical Diffusion Coefficient ◽  
Transport Numbers ◽  
Mixed Conductors ◽  
Galvanostatic Polarization ◽  
Van Der Pauw

AbstractGalvanostatic polarization of a mixed conductor located between an ionically blocking electrode and an electronically blocking electrode in an asymmetric electrochemical cell is treated in detail. Evaluation formulae for the determination of the chemical diffusion coefficient of mixed conductors with comparable ionic and electronic transport numbers are introduced. They allow the determination of the chemical diffusion coefficient of Ag1.92Te as a function of composition at 160°C from galvanostatic polarization and depolarization experiments on the asymmetric cell Ag | AgI | Ag1.92Te | Pt. The chemical diffusion coefficient shows composition dependent values between 0.002 and 0.004 cm2s-1. The electronic transport numbers are obtained independently from four-point van der Pauw measurements with typical values around 0.8–0.9.

Changing the Static and Dynamic Lattice Effects for the Improvement of the Ionic Transport Properties Within the Argyrodite Li6PS5-xSexI

2019 ◽  
Author(s):  
Roman Schlem ◽  
Michael Ghidiu ◽  
Sean Culver ◽  
Anna-Lena Hansen ◽  
Wolfgang Zeier
Keyword(s):  
Ionic Conductivity ◽  
Activation Barrier ◽  
Parent Compound ◽  
Ionic Transport ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lattice Effects ◽  
Solid State Batteries ◽  
All Solid State Batteries ◽  
Pulse Echo

<p>The lithium argyrodites Li<sub>6</sub>PS<sub>5</sub>X (X = Cl, Br, I) have been gaining momentum as candidates for electrolytes in all-solid-state batteries. While these materials have been well-characterized structurally, the influences of the static and dynamic lattice properties are not fully understood. Recent improvements to the ionic conductivity of Li<sub>6</sub>PS<sub>5</sub>I (which as a parent compound is a poor ionic conductor) via elemental substitutions have shown that a multitude of influences affect the ionic transport in the lithium argyrodites, and that even poor conductors in this class have room left for improvement.</p><p>Here we explore the influence of isoelectronic substitution of sulfur with selenium in Li<sub>6</sub>PS<sub>5-<i>x</i></sub>Se<i><sub>x</sub></i>I. Using a combination of X-ray diffraction, impedance spectroscopy, Raman spectroscopy, and pulse-echo speed of sound measurements,we explore the influence of the static and dynamic lattice on the ionic transport. The substitution of S<sup>2-</sup>with Se<sup>2- </sup>broadens the diffusion pathways and structural bottlenecks, as well as leading to a softer more polarizable lattice, all of which lower the activation barrier and lead to an increase in the ionic conductivity. This work sheds light on ways to systematically understand and improve the functional properties of this exciting material family. </p>

Four-probe electrical transport measurements on individual metallic nanowires

2007 ◽  
Vol 18 (6) ◽  
pp. 065204 ◽  
Author(s):  
A S Walton ◽  
C S Allen ◽  
K Critchley ◽  
M Ł Górzny ◽  
J E McKendry ◽  
...  
Keyword(s):  
Electrical Transport ◽  
Metallic Nanowires ◽  
Transport Measurements

Ionic transport of alkali in borosilicate glass. Role of alkali nature on glass structure and on ionic conductivity at the glassy state

2015 ◽  
Vol 410 ◽  
pp. 74-81 ◽  
Author(s):  
Muriel Neyret ◽  
Marion Lenoir ◽  
Agnès Grandjean ◽  
Nicolas Massoni ◽  
Bruno Penelon ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Borosilicate Glass ◽  
Glassy State ◽  
Glass Structure ◽  
Ionic Transport

scholarly journals Electrical transport measurements for superconducting sulfur hydrides using boron-doped diamond electrodes on beveled diamond anvil

2020 ◽  
Vol 33 (12) ◽  
pp. 124005
Author(s):  
Ryo Matsumoto ◽  
Mari Einaga ◽  
Shintaro Adachi ◽  
Sayaka Yamamoto ◽  
Tetsuo Irifune ◽  
...  
Keyword(s):  
Electrical Transport ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Transport Measurements ◽  
Diamond Anvil

scholarly journals Mixed Ionic-Electronic Conductors Based on PEDOT:PolyDADMA and Organic Ionic Plastic Crystals

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1981
Author(s):  
Rafael Del Olmo ◽  
Nerea Casado ◽  
Jorge L. Olmedo-Martínez ◽  
Xiaoen Wang ◽  
Maria Forsyth
Keyword(s):  
Energy Storage ◽  
Ionic Conductivity ◽  
Electronic Devices ◽  
Electronic Conductivity ◽  
Ionic Conductivities ◽  
New Materials ◽  
Plastic Crystals ◽  
Energy Storage Applications ◽  
Mixed Ionic Electronic Conductors ◽  
Electronic Conductors

Mixed ionic-electronic conductors, such as poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) are postulated to be the next generation materials in energy storage and electronic devices. Although many studies have aimed to enhance the electronic conductivity and mechanical properties of these materials, there has been little focus on ionic conductivity. In this work, blends based on PEDOT stabilized by the polyelectrolyte poly(diallyldimethylammonium) (PolyDADMA X) are reported, where the X anion is either chloride (Cl), bis(fluorosulfonyl)imide (FSI), bis(trifluoromethylsulfonyl)imide (TFSI), triflate (CF3SO3) or tosylate (Tos). Electronic conductivity values of 0.6 S cm−1 were achieved in films of PEDOT:PolyDADMA FSI (without any post-treatment), with an ionic conductivity of 5 × 10−6 S cm−1 at 70 °C. Organic ionic plastic crystals (OIPCs) based on the cation N-ethyl-N-methylpyrrolidinium (C2mpyr+) with similar anions were added to synergistically enhance both electronic and ionic conductivities. PEDOT:PolyDADMA X / [C2mpyr][X] composites (80/20 wt%) resulted in higher ionic conductivity values (e.g., 2 × 10−5 S cm−1 at 70 °C for PEDOT:PolyDADMA FSI/[C2mpyr][FSI]) and improved electrochemical performance versus the neat PEDOT:PolyDADMA X with no OIPC. Herein, new materials are presented and discussed including new PEDOT:PolyDADMA and organic ionic plastic crystal blends highlighting their promising properties for energy storage applications.

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