Conducting solids

Abstract

In the area of Li ion cells, highlights have included the observation of a solid solution Li_xFePO₄ at elevated temperatures by Delacourt et al. and further studies of the new promising phosphate fluoride cathode, LiVPO₄F, by Barker et al. In the area of solid oxide fuel cells/oxide ion conductors, key highlights have been the structural elucidation of the low temperature form of La₂Mo₂O₉ by Evans et al., and the development of an all perovskite based SOFC by Tao et al. In the area of superconductivity, interesting new work has been reported on K₂NiF₄ based copper oxide halides, particularly the report by Kajita et al. on the observation of n-type superconductivity on incorporation of Li into Sr₂CuO₂Br₂.