Lithium distribution and conduction paths in a new Li conductor tetragonal garnet Li7Sr2LaNb2O12.
In this proposal we plan to analyze the influence of the Li ion distribution in the three possible crystallographic sites of Li conductors with garnet-type structure. In particular, we will analyze the influence of the carrier number, and their distribution, on the transport properties. For this purpose we will analyze three samples of the Li5+xSrxLa3-xNb2O12 (for x = 0, 1, and 2), in which La3+ is substituted by (Sr2+ and Li+). On the other hand, we will also study the effect of quenching treatment on the Li distribution in order to understand the enhancement of ionic conductivity (more than one order of magnitude) that has been recently found in these materials after this thermal treatment. The analysis of the ND data will allow to correlate the structural data with those data obtained by 6Li and 7Li MAS-NMR and impedances spectroscopies. Furthermore, the analysis of Fourier Map difference of ND data recorded at low temperature (4K) will permit to determine the exact Li location. The analysis of data at different temperatures also will permit to determine diffusion path. In the case of the tetragonal phase, we will analyze the origin of the tetragonal-cubic phase transition.
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VAREZ Alejandro; CLIMENT PASCUAL Esteban; FERNANDEZ DIAZ Maria Teresa; SANZ Jesus and WEST A.R.. (2015). Lithium distribution and conduction paths in a new Li conductor tetragonal garnet Li7Sr2LaNb2O12.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1087