Determination of the temperature of the onset of ion transport from the temperature dependence of the relative change in the ultrasound velocity in the lithium ceramic Li-Si-Ge-As-S-O

An ultrasonic method is used to study the onset of ion transport inlithium oxides in a ceramic of the Li-Si-Ge-As-S-O system. The onset temperature fo r ion transport estimated from the temperature dependence of the relative c hange in the propagation speed of ultrasound is the same as that obtained b y other methods, which indicates that the ultrasonic method is applicable t o studies of the onset of ion conductivity inlithium oxide semiconductors. (c) 1999 American Institute of Physics. [S1063-7842(99)02705-1].