TY - JOUR

T1 - Point defects and non-stoichiometry in Li2TiO3

AU - Murphy, Samuel T.

AU - Hine, Nicholas D.M.

PY - 2014/2/25

Y1 - 2014/2/25

N2 - The intermediate-temperature, monoclinic β-phase of Li 2TiO3 shows a stoichiometry range from 47 to 51.5 mol % TiO2. This broad stoichiometric range may be exploited for industrial applications, such as breeder material in a fusion reactor or a microwave dielectric. Here, density functional theory is employed to calculate formation energies for the intrinsic defect species, allowing the identification of the mechanisms responsible for accommodating both excess Li2O and TiO2 across a wide range of temperatures and oxygen partial pressures. The results predict that while the exact mode of accommodating non-stoichiometry depends on factors such as the temperature and oxygen partial pressure, cation disorder plays a major role in the incorporation of non-stoichiometry and that oxygen defects are of relatively minor importance.

AB - The intermediate-temperature, monoclinic β-phase of Li 2TiO3 shows a stoichiometry range from 47 to 51.5 mol % TiO2. This broad stoichiometric range may be exploited for industrial applications, such as breeder material in a fusion reactor or a microwave dielectric. Here, density functional theory is employed to calculate formation energies for the intrinsic defect species, allowing the identification of the mechanisms responsible for accommodating both excess Li2O and TiO2 across a wide range of temperatures and oxygen partial pressures. The results predict that while the exact mode of accommodating non-stoichiometry depends on factors such as the temperature and oxygen partial pressure, cation disorder plays a major role in the incorporation of non-stoichiometry and that oxygen defects are of relatively minor importance.

U2 - 10.1021/cm4038473

DO - 10.1021/cm4038473

M3 - Journal article

AN - SCOPUS:84894673637

VL - 26

SP - 1629

EP - 1638

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 4

ER -