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X-ray powder diffraction study of $LiLnTiO_4$ (Ln=La, Nd): a lithium-ion conductor

Thangadurai, V and Shukla, AK and Gopalakrishnan, J and Joubert, O and Brohan, L and Tournoux, M (2000) X-ray powder diffraction study of $LiLnTiO_4$ (Ln=La, Nd): a lithium-ion conductor. In: European Powder Diffraction. Sixth European Powder Diffraction Conference. EPDIC 6, Aug 22-Aug 25 1998, Budapest, Hungary, pp. 965-970.

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We report the synthesis, structure and ionic conductivity of new layered perovskite oxides of the formula $LiLnTiO_4$ (Ln=La, Nd). These oxides were synthesized from their sodium analogues, $NaLnTiO_4$, by ion-exchange using molten LiNO3. Determination of crystal structure by Rietveld analysis of powder X-ray diffraction data reveals that $LiLnTiO_4$ compounds crystallize in a tetragonal structure, P4/nmm space-group (a=3.7700(2) Å, c=12.076(1) Å for La compound; a=3.7465(3) Å, c=11.895(5) Å for Nd compound), related to the parent $NaLnTiO_4$. While the Na atoms in $NaLnTiO_4$ are 9-coordinated as in the $K_2NiF_4$ structure, the Li atoms in $LiLnTiO_4$ are 4-coordinated (tetrahedral); other structural features of $NaLnTiO_4$ are retained in $LiLnTiO_4$. $LiLnTiO_4$ oxides show moderate lithium-ion conductivity $(s\≈10^{-4}-10^{-5} S.cm^{-1} at 780°C)$ that is higher by about two orders of magnitude than that of$Li_2La_2Ti_3O_10$

Item Type: Conference Paper
Publication: Materials Science Forum
Publisher: Trans Tech Publications
Additional Information: Copyright of this article belongs to Trans Tech Publications
Keywords: bond lengths;crystal chemistry;crystal structure;ion exchange;ionic conductivity;lanthanum compounds;lithium compounds;neodymium compounds;powder technology;solid electrolytes
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 30 Jul 2007
Last Modified: 27 Aug 2008 12:43
URI: http://eprints.iisc.ac.in/id/eprint/10339

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