the defect
disorder of Li2TiO3 was determined using the DFT method by
Murphy [44] and Murphy and Hine [45]. It has been shown that
the preferred occupation sites for tritium in the Li2TiO3 lattice
are the octahedral sites near the lithium layers [46]. However,
the presence of lithium vacancies in the lithium layers would
enable tritium to migrate to these empty sites. Therefore, the
transport of tritium in lithium layers is profoundly influenced
by the concentration of lithium vacancies. This conclusion is
supported by the results of Wu et al., [47] on ionic charge
transport, who observed that Mg-doped Li2TiO3 exhibits larger
lithium ionic conduction than that of pure Li2TiO3. In the latter
case, magnesium incorporation is responsible for the formation
of lithium vacancies. A similar effect has been observed
for Ta-doped Li2TiO3. In that case tantalum ions are incorporated
into the Ti sites .