ChemInform Abstract: Mixed Oxides La2/3‐xLi3xTiO3

Abstract

024ChemInform Abstract with 1/24 < x < 1/6 are obtained by precipitation of the components from solutions and subsequent heating to 1250-1330 rc C for 2-3 h. The title compounds possess a perovskite type structure within the range of x given above. The main contribution to the perovskite structure is made by the lanthanum ions, which fulfil the structural requirements necessary for the sublattice A. The lithium ions stabilize the structure by lowering the number of vacancies. Substitution of the lanthanum ions by lithium ions changes the crystal structure from rhombic to tetragonal. The electrical conductivity of the title compounds reveals a high cationic conductivity due to the lithium ions.

Non-Arrhenius Temperature Dependence of Conductivity in Lanthanum Lithium Tantalate

“…Lanthanum lithium titanates with the A-site deficient perovskite structure are well-known as crystalline fast lithium-ionic conductors, whose crystal structure, electrical properties and ion dynamics have been minutely investigated 7 since the earlier work of Belous et al 8 and Inaguma et al 9 Similarly, we have conducted a lot of investigations about lanthanum lithium tantalates which also have the A-site deficient perovskite structure. 10 -16 The purpose of the present work is to discuss the non-Arrhenius ionic conductivity observed in lanthanum lithium tantalates, on the basis of the data on the ion dynamics obtained by means of nuclear magnetic resonance NMR and impedance spectroscopy.…”

Temperature Trends of the Permittivity in Complex Oxides of Rare-Earth Elements With Perovskite-Type Structure

“…These materials are urgently required to reduce the size and the weight of radio equipment. Recently, very promising temperature stable ceramic materials with high permittivity (of about 100) have been developed on the basis of the defect perovskite Ln 2/3 TiO 3 (Ln is rare-earth element) [1,2]. This structure contains 1/3 vacant positions in the lanthanum sublattice that permits aliovalent substitution of the lanthanum ions by lower valence ions, for example, alkali and/or alkaline-earth ions.…”

“…This structure contains 1/3 vacant positions in the lanthanum sublattice that permits aliovalent substitution of the lanthanum ions by lower valence ions, for example, alkali and/or alkaline-earth ions. When vacant sites are filled with alkali ions M for instance, by sodium ions -according to the formula Ln 2/3−x M 3x TiO 3 , highpermittivity dielectrics with the perovskite structure are formed [2].…”

Relevance of solid electrolytes for lithium-based batteries: A realistic view

“…To date, one of the best oxide Li ion conductors is the solid s o l u t i o n l i t h i u m l a n t h a n u m t i t a n a t e ( L LT O ) Li 3x La (2/3)−x □ (1/3)−2x TiO 3 (0.06 < x < 0.16, highest Li conductivity of 1.4 × 10 −3 S/cm observed for x = 0.11) [53], which is d e r i v e d f r o m t h e p a r e n t A B O 3 -t y p e p e r o v s k i t e La (2/3) □ (1/3) TiO 3 [54]. Substitution of La by Li and the presence of a large A-site vacancy concentration in the tetragonal perovskite structure allows for facile diffusion of Li through vacant A-site cages, separated by oxygen bottlenecks.…”