Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 27, Issue 13-15, Pages 4215-4218Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2007.02.118
Keywords
powder solid state reaction; X-ray method; NMR spectroscopy; ionic conductivity; batteries
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Titanium-based Nasicon-type Compounds with formula Li1+xTi2-xAl(PO4)(3) and LiTi2-Zr-x(PO4), have been prepared and studied with X-ray Diffraction (XRD). Nuclear Magnetic Resonance (NMR) and Electric Impedance (EI) techniques. From the analysis of the Li-7 and (31) NMR spectra, cation distribution and Li mobility have been deduced. The substitution of Ti4+ by a large Zr4+, cation expands the unit cell but the grain interior conductivity remains near that of the parent LiTi2(PO4)3 compound. However, substitution of Ti4+ by a smaller Al3+ cation reduces the unit cell dimensions of the Nasicon framework, but enhances about three orders of magnitude the conductivity. In Zr doped samples, the expansion of the unit cell destabilizes Li coordination at M-1 sites; however, in Al doped samples, the increment of Li amount enhances Li-Li repulsions. In both cases. creation of vacancies at M-1 sites increases Li mobility. (c) 2007 Elsevier Ltd. All right reserved.
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