Abstract
The average structure of congruent lithium niobate has been reexamined by X-ray and neutron powder diffraction. The Rietveld refinements show that the Li-site vacancy model [Li1 - 5xNbx□4x]NbO3 in which the Nb site is fully occupied describes best the average defect structure. The Nb-site vacancy model [Li1 - 5x Nb5x][Nb1 - 4x □4x]O3 and the Li split model [Li1 - 5x - yNbx □4x + y][Liy]NbO3 can be definitely rejected. Several Nb split models in which the excess Nb atoms are distributed among the Li and the vacant cation sites, however, are also possible. The necessity of combined X-ray and neutron refinements is pointed out.
| Item Type: | Journal article |
|---|---|
| Faculties: | Geosciences > Department of Earth and Environmental Sciences > Crystallography and Materials Science |
| Subjects: | 500 Science > 550 Earth sciences and geology |
| Language: | English |
| Item ID: | 18611 |
| Date Deposited: | 10. Mar 2014, 14:11 |
| Last Modified: | 29. Apr 2016, 09:15 |
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