X-ray Powder Diffraction Study Of $LiLnTiO_4$ (Ln=La, Nd): A Lithium-ion Conductor

Content Provider	Indian Institute of Science (IISc)
Author	Thangadurai, V. Shukla, A. K. Gopalakrishnan, J. Joubert, O. Brohan, L. Tournoux, M.
Copyright Year	2000
Abstract	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) êA, c=12.076(1) êA for La compound; a=3.7465(3) êA, c=11.895(5) êA 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 $(s\≈10^{-4}-10^{-5} S.cm^{-1} at 780ÀC)$ that is higher by about two orders of magnitude than that of$Li_2La_2Ti_3O_10$
File Format	PDF
Journal	PeerReviewed
Language	English
Publisher	Trans Tech Publications
Publisher Date	2000-01-01
Access Restriction	Authorized
Subject Keyword	Solid State & Structural Chemistry Unit
Content Type	Text
Resource Type	Article