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Microstructural and molecular level characterisation of plastic crystal phases of pyrrolidinium trifluoromethanesulfonyl salts

Hill, A. J., Huang, J., Efthimiadis, J., Meakin, P., Forsyth, M. and MacFarlane, D. R. 2002, Microstructural and molecular level characterisation of plastic crystal phases of pyrrolidinium trifluoromethanesulfonyl salts, Solid state ionics, vol. 154-155, pp. 119-124.

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Title Microstructural and molecular level characterisation of plastic crystal phases of pyrrolidinium trifluoromethanesulfonyl salts
Author(s) Hill, A. J.
Huang, J.
Efthimiadis, J.
Meakin, P.
Forsyth, M.
MacFarlane, D. R.
Journal name Solid state ionics
Volume number 154-155
Start page 119
End page 124
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2002-12-02
ISSN 0167-2738
1872-7689
Keyword(s) plastic crystals
ionic conductivity
vacancies
positron lifetimes
Summary Ambient temperature conductive plastic crystal phases of alkylmethylpyrrolidinium trifluoromethanesulfonyl amide (TFSA) salts are studied using positron annihilation lifetime spectroscopy (PALS) to examine the role of vacancy size and concentration in conductivity. The ethyl methylpyrrolidinium TFSA salt (P12 TFSA) has larger vacancies and a greater concentration of vacancies than the dimethylpyrrolidinium TFSA salt (P11 TFSA) over the temperature range investigated. The relative vacancy size and concentration vary with temperature and reflect the solid–solid transitions as measured by differential scanning calorimetry (DSC). P12 TFSA has greater conductivity than P11 TFSA and has furthermore been observed to exhibit slip planes at room temperature. P12 TFSA has greater entropy changes associated with solid–solid phase transitions below the melting point than P11 TFSA possibly indicating greater rotational freedom in P12 TFSA. These results support the notion that the diffusion, conduction, and plastic flow properties of the pyrrolidinium TFSA salts are derived from the lattice vacancies.
Language eng
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2002, Elsevier Science B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030163

Document type: Journal Article
Collections: Institute for Technology Research and Innovation
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.