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@ARTICLE{Leu:201679,
author = {Leu, Lii-Cherng and Bian, Jianjiang and Gout, Delphine and
Letourneau, Steve and Ubic, Rick},
title = {{O}rder–disorder transition in the (1−x){L}i $_{2}$
{T}i{O} $_{3}$ –x{M}g{O} system (0 ≤ x ≤ 0.5)},
journal = {RSC Advances},
volume = {2},
number = {4},
issn = {2046-2069},
address = {London},
publisher = {RSC Publishing},
reportid = {FZJ-2015-03973},
pages = {1598 - 1604},
year = {2012},
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.},
cin = {ICS-1 / Neutronenstreuung ; JCNS-1},
ddc = {540},
cid = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106},
pnm = {451 - Soft Matter Composites (POF2-451) / 54G - JCNS
(POF2-54G24)},
pid = {G:(DE-HGF)POF2-451 / G:(DE-HGF)POF2-54G24},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000299695300052},
doi = {10.1039/C1RA00677K},
url = {https://juser.fz-juelich.de/record/201679},
}