An Investigation of Fast Ion Transport in Solids Using Conductivity and N.M.R. (Fast Ion Transport in Solids)

摘要

The lanthanide fluorides and mixtures of these fluorides exhibit fast ion conduction. A study has been made of ionic transport in single crystals of LaF3 systems using electrical conductivity and N.M.R. techniques. Analysing the conductivity results in terms of Schottky disorder yield values of the defect formation and migration enthalpies as 2.12 and 0.28 eV, respectively. At low temperatures the study of oriented crystals showed the conductivity // to the c-axis was twice that 1 to the c-axis. The N.M.R. relaxation time T1, T10 and T2 exhibited a complex behaviour. A model was developed to interpret these results on the basis of non-equivalent F sites in the lattice. Single crystals of La1-x Srx F3-x are good F ion conductors, better than would have been expected from previous publications. A full discussion of the results has been presented, along with suggestions for future work. (Author)