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A surface characterisation and microstructural study by Scanning Electron Microscopy of the N-methyl-N-alkylpyrrolidinium tetrafluoroborate organic salts

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Abstract

A microstructural characterisation of the family of N-methyl-N-alkylpyrrolidinium tetrafluoroborate organic salts was carried out by observation of powder surface morphologies with the aim of extending the microstructure-property correlation. Inherent difficulties limiting extensive studies of organic solids by SEM, including volatility under vacuum, charging due to electron beam irradiation, and air-sensitivity were overcome with the use of a Field Emission SEM and cryostage attachment. This technique, providing considerable improvements in image quality at low accelerating voltages, enabled direct observation of complex microstructural features in samples exhibiting high temperature plastic crystalline phases (N,N-dimethylpyrrolidinium tetrafluoroborate [P11BF4]; N-methyl-N-ethylpyrrolidinium tetrafluoroborate [P12BF4]; N-methyl-N-propylpyrrolidinium tetrafluoroborate [P13BF4]). Extensive lattice imperfections including grain boundaries, slip planes and dislocation pits were observed within particles of approximately 200 μm diameter. The N-methyl-N-butylpyrrolidinium tetrafluoroborate (P14BF4) sample in this series revealed columnar single crystals with high aspect ratios. The origin of plastic flow properties is discussed using single crystal and polycrystalline slip observations and a relationship proposed between defect characteristics and transport properties.

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Authors and Affiliations

  1. School of Physics and Materials Engineering, Monash University, PO Box 69M, Clayton, Victoria, 3800, Australia

    J. Efthimiadis, M. Forsyth & D. R. MacFarlane

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  1. J. Efthimiadis
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  2. M. Forsyth
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  3. D. R. MacFarlane
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Efthimiadis, J., Forsyth, M. & MacFarlane, D.R. A surface characterisation and microstructural study by Scanning Electron Microscopy of the N-methyl-N-alkylpyrrolidinium tetrafluoroborate organic salts. Journal of Materials Science 38, 3293–3301 (2003). https://doi.org/10.1023/A:1025142106139

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