Please use this identifier to cite or link to this item: https://doi.org/10.1039/b110863h
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dc.titleFast ion conduction in the Li-analogues of Nasicon, Li1 + x [(Ta1 - xGex)Al](PO4)3
dc.contributor.authorLeo, C.J.
dc.contributor.authorSubba Rao, G.V.
dc.contributor.authorChowdari, B.V.R.
dc.date.accessioned2014-10-16T09:25:27Z
dc.date.available2014-10-16T09:25:27Z
dc.date.issued2002
dc.identifier.citationLeo, C.J., Subba Rao, G.V., Chowdari, B.V.R. (2002). Fast ion conduction in the Li-analogues of Nasicon, Li1 + x [(Ta1 - xGex)Al](PO4)3. Journal of Materials Chemistry 12 (6) : 1848-1853. ScholarBank@NUS Repository. https://doi.org/10.1039/b110863h
dc.identifier.issn09599428
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/96609
dc.description.abstractFast lithium ion conducting Nasicon compounds, Li1 + x [(Ta1 - xGex)Al](PO4)3, x = 0-1.0 have been synthesized, characterized by X-ray diffraction and X-ray photoelectron spectroscopy (XPS) and their ionic conductivities were determined as a function of temperature (T) and frequency (f) by the impedance technique. The hexagonal lattice parameters and cell volume showed a systematic change with the germanium dopant, x. The XPS Li(1s) spectra show two peaks with binding energies (BEs) of 55.0 and 55.9 eV for all the Ge-doped compounds, due to lithium ion occupation in the Type I and II lattice sites. The measured σionic at 60 °C varies from 2.1-5.5 × 10-5 S cm-1 for x in the range 0.4-0.8 and Ea and log σo go through a broad minimum and maximum respectively. From an analysis of σionic vs. f at various T, the f-independent σionic(dc), the hopping frequency (fp) of the mobile lithium ions and the exponent n of the ac dispersive regime were determined. The values of the activation energies of the ac and dc conductivity and that of the hopping process were found to be the same, implying that the mobile ion concentration is T-independent. Also, the low-frequency dispersion due to the electrode polarization appears to correlate with that of the f-independent dc conductivity.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1039/b110863h
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1039/b110863h
dc.description.sourcetitleJournal of Materials Chemistry
dc.description.volume12
dc.description.issue6
dc.description.page1848-1853
dc.description.codenJMACE
dc.identifier.isiut000175768600041
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