Please use this identifier to cite or link to this item:
|Title:||Preparation and mobile ion transport studies of Ta and Nb doped Li 6Zr2O7 Li-fast ion conductors||Authors:||Rao, R.P.
|Keywords:||Bond valence approach
Molecular dynamics simulations
|Issue Date:||25-Jan-2012||Citation:||Rao, R.P., Reddy, M.V., Adams, S., Chowdari, B.V.R. (2012-01-25). Preparation and mobile ion transport studies of Ta and Nb doped Li 6Zr2O7 Li-fast ion conductors. Materials Science and Engineering B: Solid-State Materials for Advanced Technology 177 (1) : 100-105. ScholarBank@NUS Repository. https://doi.org/10.1016/j.mseb.2011.09.015||Abstract:||Pure and doped Li6-x(Zr2-xMx)O 7, M = Nb and Ta; x = 0, 0.15 compounds have been prepared by the urea combustion method followed by annealing at 950 °C for 8 h. The samples are characterized by X-ray diffraction and impedance spectroscopy. Ionic conductivities, σionic, were determined in the temperature range of 60-360 °C by impedance spectroscopy. We observe that the Ta doped Li6Zr2O7 has a measurable σ ionic at ∼160 °C, and at 300 °C exhibits a conductivity value of 1 × 10-3 S/cm. The temperature dependence of the conductivity in the range 100-360 °C obeys an Arrhenius relation, yielding an activation energy of Ea = 0.95 eV (for M = Ta and x = 0.15). The bond valence approach has been used to visualise Li+ ion migration pathways and the conductivity mechanism in these compounds. The lowest energy pathway is found to extend along the [0 1 2] direction. The Bond valence analysis also indicates a significantly anisotropic Li-ion conductivity in compounds with Li6Zr2O7 type structure, predicting activation energies of 1.1 and 0.9 eV for the low energy pathway in undoped and doped Li6Zr2O7. © 2011 Elsevier B.V. All rights reserved.||Source Title:||Materials Science and Engineering B: Solid-State Materials for Advanced Technology||URI:||http://scholarbank.nus.edu.sg/handle/10635/86663||ISSN:||09215107||DOI:||10.1016/j.mseb.2011.09.015|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Aug 23, 2019
WEB OF SCIENCETM
checked on Aug 14, 2019
checked on Aug 17, 2019
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.