Crystal growth and crystal structures of the layered ionic conductors - sodium lithium titanium oxides

Citation
Gv. Shilov et al., Crystal growth and crystal structures of the layered ionic conductors - sodium lithium titanium oxides, INT J INORG, 2(5), 2000, pp. 443-449
Citations number
35
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
INTERNATIONAL JOURNAL OF INORGANIC MATERIALS
ISSN journal
14666049 → ACNP
Volume
2
Issue
5
Year of publication
2000
Pages
443 - 449
Database
ISI
SICI code
1466-6049(200010)2:5<443:CGACSO>2.0.ZU;2-H
Abstract
Single crystals of four structure types have been grown from melts of the N a2O-Li2O-TiO2 system. Structures of two of them have been determined by the single-crystal X-ray diffraction. The both structures comprise brucite-lik e octahedral (Ti,Li)O-2 layers with random Li/Ti distribution. One of them, (Na0.73Li0.24)(Li0.32Ti0.68)O-2, is rhombohedral (alpha -NaFeO2 type), whe reas the other, Na-0.66(Li0.22Ti0.78)O-2, hexagonal containing sodium ions in trigonal prisms of two kinds with occupancies 0.36(1) and 0.29(3), respe ctively. One more crystal, (Na,Li)(3)(LiTi2)O-6, is a superlattice of the a lpha -NaFeO2 type due to Li/Ti ordering. Relationships between the cation-c ation repulsion, cationic disorder, relative stability of the structure typ es and their cation transport properties have been discussed. (C) 2000 Else vier Science Ltd. All rights reserved.