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| Home > Publications database > Order–disorder transition in the (1−x)Li $_{2}$ TiO $_{3}$ –xMgO system (0 ≤ x ≤ 0.5) |
| Home > Publications database > Order–disorder transition in the (1−x)Li $_{2}$ TiO $_{3}$ –xMgO system (0 ≤ x ≤ 0.5) |
| Journal Article | FZJ-2015-03973 |
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2012
RSC Publishing
London
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Please use a persistent id in citations: doi:10.1039/C1RA00677K
Abstract: The order–disorder phase transition of magnesium lithium titanate solid–solution (1−x)Li2TiO3–xMgO (0 ≤ x ≤ 0.5) ceramics prepared by conventional solid-state processing has been examined. The phase and structural analysis was carried out using electron diffraction, neutron diffraction and high-resolution transmission electron microscopy. Both electron and neutron diffraction results revealed the onset of an order-to-disorder transition at 0.3 < x < 0.4. Superlattice reflections found in certain regions of x = 0.2 samples and most areas of x = 0.3 samples were caused by a twin structure stabilized by Mg incorporation. Rietveld refinements of neutron diffraction data suggested a random distribution of Mg on the Li 4e sites and equal distribution of Mg on the two Ti 4e sites for x ≤ 0.3. As the Mg content continues to increase, the crystal symmetry transforms from monoclinic to cubic rocksalt. Consequently, the cation ordering on the 8f and 4d sites of the C2/c structure became corrupted and turned into short-range ordering on the 4a sites of a cubic structure with Image ID:c1ra00677k-t1.gif symmetry, resulting in diffuse scattering in electron diffraction patterns.
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