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Stoichiometry Dependence of Li+ Diffusivity in LiNbO3 Crystal in Off-Congruent, Li-Deficient Regime.
- Source :
- Journal of the American Ceramic Society; Mar2012, Vol. 95 Issue 3, p1018-1022, 5p, 5 Graphs
- Publication Year :
- 2012
-
Abstract
- Diffusivity at 1130°C of Li<superscript>+</superscript> in LiNbO<subscript>3</subscript> crystal in off-congruent, Li-deficient regime has been studied as a function of Li<subscript>2</subscript>O-content. A diffusion-limited Li<subscript>2</subscript>O-content reduction depth profile in an X- or Z-cut plate, ranging from 47.2 to 48.5 mol%, was produced by carrying out Li-poor vapor transport equilibration ( VTE) treatment on 1-mm-thick, initially congruent plates at 1130°C for 150 h. The profile was obtained by alternatively doing the optical polish to one crystal surface and the Li<subscript>2</subscript>O-content characterization on the polished surface through the measurement on birefringence. The Boltzmann-Matano mathematical analysis was applied to the profile to obtain the Li<subscript>2</subscript>O-content dependence of Li<superscript>+</superscript> diffusivity. The results show that the diffusivity decreases with the decreased Li<subscript>2</subscript>O-content and the decrease is by at least one order of magnitude as the Li<subscript>2</subscript>O-content decreases by 1 mol% from 48.5 mol%. The diffusion shows slight anisotropy and is faster along the optical axis direction of crystal. In combination with previously reported result in the near-stoichiometric regime, the diffusivity over the Li<subscript>2</subscript>O-content range from 47 to 50 mol% is presented. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 95
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 72459509
- Full Text :
- https://doi.org/10.1111/j.1551-2916.2011.04906.x