Synthese et propriétés de conduction ionique des phases Li 8-2 xCa xCeO 6 (0 < x ≤ 0,5) et Li 6CaCeO 6
Abstract
The solid solution Li 8-2 xCa xCeO 6 (0 < x ≤ 0,5) and the definite phase Li 6CaCeO 6 have been obtained at 800°C through a study of LiCaCeO system. Electrical measurements on the doped phases Li tetr.6 [Li 2-2 xCa xCe□] oct.O 6 show that the conductivity varies slightly with the creation of vacancies in the octahedral layers. This result unambiguously confirms the following diffusion mechanism: the conduction is assumed essentially by lithium ions located in the tetrahedral layers. The compound Li 6CaCeO 6 is isostructural with Li 6In 2O 6. The cell is trigonal, P overline3C1, a = 10,015 Å, c = 10,603 Å, {c}/{a} = 1,058 7, and Z = 6. This new quaternary phase, which belongs to the same structural family of oxides of the type Li 8MO 6, either pure or doped with calcium, may be represented by the formula Li tetr.6[Ca Ce□] oct.O 6. Electrical and structural data are correlated for this compound.
- Publication:
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Journal of Solid State Chemistry France
- Pub Date:
- December 1983
- DOI:
- 10.1016/0022-4596(83)90202-5
- Bibcode:
- 1983JSSCh..50..312B