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Effect of lithium ion content on the lithium ion conductivity of the garnet-like structure Li5+xBaLa2Ta2O11.5+0.5x (x = 0–2)

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Abstract

We report systematic studies on the transport properties by varying the lithium oxide content of the garnet-based solid electrolyte Li5+xBaLa2Ta2O11.5+0.5x (x=0, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00) for understanding the ionic conductivity dependence on the crystal lattice parameter and carrier concentration. Powder X-ray diffraction data of Li5+xBaLa2Ta2O11.5+0.5x (x=0, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00) indicate the existence of the garnet-like structure for any of the compositions. The cubic lattice parameter was found to increase with increasing x and reaches a maximum at x=1.00, then decreases slightly with a further increase in x. Impedance measurements obtained at 50 °C indicate a maximum of the grain-boundary resistance (Rgb) contribution to the total resistance (Rb+Rgb) at x=0.0 and a considerable decrease with increase in lithium concentration. The total (bulk + grain-boundary) and bulk ionic conductivity increase with increasing lithium content and reach a maximum at x=1.00 and then decrease slightly with further increase in x. Among the investigated compounds, Li6BaLa2Ta2O12 exhibits the highest total (bulk + grain-boundary) and bulk ionic conductivity of 1.5×10-4 and 1.8×10-4 S/cm at 50 °C, respectively. The results obtained in the present investigation of the Li5+xBaLa2Ta2O11.5+0.5x (x=0–2) series clearly revealed that the lithium content plays a major role in decreasing the grain boundary resistance contribution to the total resistance and also in increasing the ionic conductivity of the garnet-like compound.

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Authors and Affiliations

  1. Sensors and Solid State Ionics, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143, Kiel, Germany

    R. Murugan & W. Weppner

  2. Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB, T2N 1N4, Canada

    V. Thangadurai

Authors
  1. R. Murugan
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  2. V. Thangadurai
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  3. W. Weppner
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Correspondence to W. Weppner.

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PACS

66.10.Ed; 82.45.Gj; 82.47.Aa

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Murugan, R., Thangadurai, V. & Weppner, W. Effect of lithium ion content on the lithium ion conductivity of the garnet-like structure Li5+xBaLa2Ta2O11.5+0.5x (x = 0–2). Appl. Phys. A 91, 615–620 (2008). https://doi.org/10.1007/s00339-008-4494-2

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