Dielectric characteristics of fast Li ion conducting garnet-type Li5+2xLa3Nb2 xYxO12 (x = 0.25, 0.5 and 0.75)

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dc.contributor.authorNarayanan, Sumaletha
dc.contributor.authorBaral, Ashok Kumar
dc.contributor.authorThangadurai, Venkataraman
dc.date.accessioned2016-09-09T14:33:40Z
dc.date.available2016-09-09T14:33:40Z
dc.date.issued2016
dc.description.abstractHere, we report the dielectric characteristics of Li-stuffed garnet-type Li5+2xLa3Nb2−xYxO12 (x = 0.25, 0.5 and 0.75) in the temperature range about −53 to 50 °C using AC impedance spectroscopy. All the investigated Li-stuffed garnet compounds were prepared, under the same condition, using conventional solid-state reaction at elevated temperature in air. The Nyquist plots show mainly bulk contribution to the total Li+ ion conductivity for Li5.5La3Nb1.75Y0.25O12 (Li5.5–Nb) and Li6La3Nb1.5Y0.5O12 (Li6–Nb), while both bulk and grain-boundary effects are visible in the case of Li6.5La3Nb1.25Y0.75O12 (Li6.5–Nb) phase at ∼−22 °C. Non-Debye relaxation process was observed in the modulus AC impedance plots. The dielectric loss tangent of Li5+2xLa3Nb2−xYxO12 are compared with that of the corresponding Ta analogue, Li5+2xLa3Ta2−xYxO12 and showed a decrease in peak intensity for the Nb-based garnet samples which may be attributed to a slight increase in their Li+ ion conductivity. The relative dielectric constant values were also found to be higher for the Ta member (>60 for Li5+2xLa3Ta2−xYxO12) than that of the corresponding Nb analogue (∼50 for Li5+2xLa3Nb2−xYxO12) at below room temperature. A long-range order Li+ ion migration pathway with relaxation time (τ0) 10−18–10−15 s and an activation energy of 0.59–0.40 eV was observed for the investigated Li5+2xLa3Nb2−xYxO12 garnets and is comparable to that of the corresponding Ta-based Li5+2xLa3Ta2−xYxO12 garnets.
dc.description.refereedYesen_US
dc.identifier.citationNarayanan, S., Baral, A. K., & Thangadurai, V. (2016). Dielectric characteristics of fast Li ion conducting garnet-type Li5+2xLa3Nb2−xYxO12 (x = 0.25, 0.5 and 0.75). Physical Chemistry Chemical Physics, 18(22), 15418–15426. https://doi.org/10.1039/c6cp02287a
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/35419
dc.identifier.issn1463-9084
dc.identifier.urihttp://hdl.handle.net/1880/51574
dc.language.isoenen_US
dc.publisherRoyal Society of Chemistryen_US
dc.publisher.departmentDepartment of Chemistryen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.publisher.urlhttp://pubs.rsc.org/en/journals/journal/cpen_US
dc.rightsUnless otherwise indicated, this material is protected by copyright and has been made available with authorization from the copyright owner. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.rights.urihttp://creativecommons.org/licenses/by-nc/3.0
dc.titleDielectric characteristics of fast Li ion conducting garnet-type Li5+2xLa3Nb2 xYxO12 (x = 0.25, 0.5 and 0.75)en_US
dc.typejournal article
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