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- Title
Effect of Synthesis Conditions on the Lithium Nonstoichiometry and Properties of La<sub>2/3 – x</sub>Li<sub>3x</sub>□<sub>4/3 – 2x</sub>M<sub>2</sub>O<sub>6</sub> (M = Nb, Ta) Perovskite-like Solid Solutions.
- Authors
Belous, A. G.; Gavrilenko, O. N.; Pashkova, E. V.; Danil'chenko, K. P.; V'yunov, O. I.
- Abstract
The effects of the nominal composition and synthesis conditions on the lithium nonstoichiometry of La2/3-xLi3x...4/3-2xNb2O6 (I) and La2/3-xLi3x...4/3-2xTa2O6 (II) solid solutions are studied. The results demonstrate that lithium losses can be reduced from 26-30 to 14-15 mol % in system I and from 15 to 4 mol % in system II. It is shown that the disturbance of electroneutrality caused by Li non stoichiometry in the solid solutions is eliminated via the formation of oxygen vacancies in positions O(1) (1f: ½ ½ 0) and O(2) (1h: ½ ½ ½) of the cation-deficient perovskite structure. The optimal lithium ion conductivity is offered by solid solutions with .../3x ... 2.6 and x ... 0.136-0.143.
- Subjects
SOLID solutions; PEROVSKITE; INORGANIC synthesis; LITHIUM compounds; OXYGEN; CRYSTAL defects
- Publication
Inorganic Materials, 2004, Vol 40, Issue 8, p867
- ISSN
0020-1685
- Publication type
Article
- DOI
10.1023/B:INMA.0000037935.60011.1b