High-Temperature Thermophysical Property Measurements on Non-Stoichiometric Composition of Li₂TiO₃

抄録

Lithium titanate (Li₂TiO₃) ceramics is among the most promising candidates for solid breeder materials of fusion reactors. So far, many thermal property data of Li₂TiO₃ have been reported. However, those data are different, from researcher to researcher and not appropriate enough for the blanket design. In the present study, thermal properties of Li₂TiO₃ ceramics having different compositions (Li₂O/TiO₂=0.90∼1.00) have been determined with the laser-flash method over a temperature range from 300 to 1100 K. The observed value of thermal diffusivity decreased with increase in non-stoichiometry. It was also found that the temperature dependence of the thermal diffusivity showed a fall at around 1100 K for all the samples, in accordance with the lattice parameters of the samples, which also showed variation at about 1100 K.