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Conduction in ionic organic plastic crystals: the role of defects
journal contribution
posted on 2006-10-31, 00:00 authored by J Huang, A Hill, Maria ForsythMaria Forsyth, D MacFarlane, A HollenkampThis paper describes the relationship between the ionic conduction and the characteristics of defects in plastic crystalline phases of N,N-dimethylpyrrolidinium bis(trifluoromethanesulfonyl)amide (P 11 TFSA). Positron annihilation lifetime spectroscopy (PALS) shows that the phase III to phase II transition involves the generation and expansion of vacancies, which is confirmed by measurement of volumetric expansion. The vacancies expand to match the cation size in phase II and this gives rise to an increase in the conductivity. The relationship between the vacancy volume and the conductivity obeys a Cohen-Turnbull free volume conduction model. The critical volume matches the volume of a cation-anion pair in phase III, which indicates a Schottky mechanism. The critical volume shows a greater value in phase II, which is probably indicative of a pipe diffusion mechanism.
History
Journal
Solid state ionicsVolume
177Issue
26-32Season
Special issue: Solid state ionics 15: proceedings of the 15th international conference on solid state ionics, part IIPagination
2569 - 2573Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0167-2738eISSN
1872-7689Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2006, Crown CopyrightUsage metrics
Keywords
plastic crystalsdefectsionic conductivitypositron lifetimesvolumetric expansionScience & TechnologyPhysical SciencesChemistry, PhysicalPhysics, Condensed MatterChemistryPhysicsELECTRICAL-CONDUCTIVITYTHERMAL MEASUREMENTSMAGNETIC-RESONANCESELF-DIFFUSIONROTATOR PHASEPIVALIC ACIDSALTSH-1Condensed Matter Physics
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