The structural and electrical properties of Li5TlO5 were investigated. Li5TlO4 was found to be sensitive to moisture or CO2 in ambient environment. An electronically conducting brown to black thin layer, mainly composed of LiTlO2, was formed on the surface of Li5TlO4 pellets during sintering and impedance measurement. The electronic conduction exceeded ionic conduction below 150°C. Above 150°C, ionic conduction became predominant with a maximum conductivity of 1×10-3 (Ω-cm)-1 at 250°C for one of the samples. This value is high in comparison with the conductivity of other Li5MIIIO4 isomorphs Above 400°C, a large increase in the conductivity, probably due to the presence of LiOH, was observed. Sample-to-sample differences in conductivity and variation during heating-cooling cycles were noted. These results are discussed in relation to the structural and thermal properties.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics