Relation between crystal structure and ionic conductivity for Na3(1+x)Sc2−x(PO4)3
Abstract At room temperature a new superstructure is reported. The observed order-disorder transition temperature about 160°C is in agreement with conductivity data. It is pointed out that the order state corresponds to a new re-arrangement of Na ions with respect to the disordered arrangement of Na+ in R 3 c high temperature phase whereas very little change in the [Sc2(PO4)3] framework was observed at high and low temperature.