2008
DOI: 10.1016/j.ssi.2008.01.047
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Synthesis and structural characterisation of the Li ion conducting garnet-related systems, Li6ALa2Nb2O12 (A=Ca, Sr)

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Cited by 44 publications
(42 citation statements)
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“…A structural analysis of Li 6 La 2 SrNb 2 O 12 shows the same complex distribution of lithium across octahedra and tetrahedra but identified a small reduction in the occupancy of the tetrahedra, from 0.59 at room temperature to 0.55 at 350°C. [177] Whilst this change is at the detection limits of the structural refinement, conductivity data show a clear change in the performance of this material depending on the sample history. If the material is quenched from high temperature then the low temperature conductivity is increased by a factor of five compared with a sample that has been slowly cooled to room temperature as shown in Figure 3.29.…”
Section: Doping Studies Of Lithium Perovskitesmentioning
confidence: 96%
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“…A structural analysis of Li 6 La 2 SrNb 2 O 12 shows the same complex distribution of lithium across octahedra and tetrahedra but identified a small reduction in the occupancy of the tetrahedra, from 0.59 at room temperature to 0.55 at 350°C. [177] Whilst this change is at the detection limits of the structural refinement, conductivity data show a clear change in the performance of this material depending on the sample history. If the material is quenched from high temperature then the low temperature conductivity is increased by a factor of five compared with a sample that has been slowly cooled to room temperature as shown in Figure 3.29.…”
Section: Doping Studies Of Lithium Perovskitesmentioning
confidence: 96%
“…The displacement from the centre of the octahedron reduces four and increases two of the Li-O distances and gives what can be considered as a distorted tetrahedral coordination environment that is a consistent observation in these lithium-stuffed compositions. [173][174][175][176][177] By studying these structures over the temperature range 2 K to 873 K it was established that the lithium distribution is largely temperature independent indicating that the time and spatially averaged structural picture represents static disorder of lithium ions, rather than a dynamic motion of cations inside the octahedron. In addition to (a) the three tetrahedral sites occupied in conventional garnets there are (b) two trigonal prismatic and (c) six large octahedral sites per formula unit that are capable of accommodating Li þ [165,173] The presence of shared polyhedral faces between the oxide tetrahedra and octahedra necessarily leads to the presence of short Li Á Á Á Li distances in the structure.…”
Section: Doping Studies Of Lithium Perovskitesmentioning
confidence: 99%
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“…In addition, our previous work revealed that partially substituting Sb 5 þ for Zr 4 þ introduces a special grain boundary layer, which improves grain boundary and then total conductivity [22]. It is reported that ionic conductivity has been enhanced by increase in the occupancy of Li2 site while reduction in the occupancy of Li1 site through the substitution of divalent alkaline-earth metal ions (Ca 2 þ , Sr 2 þ , Ba 2 þ ) for La 3 þ in garnet structure electrolyte [23,24].…”
Section: Introductionmentioning
confidence: 99%