No CrossRef data available.
Published online by Cambridge University Press: 28 February 2011
The polymer electrolyte PEO:LiBF4 at concentrations 2:1, 4:1, 8:1, 16:1 and pure PEO (in methanol as solvent) was studied in the temperature range 220–340 K using impulsive stimulated light scattering, a time-delayed four-wave mixing (‘transient grating’) technique. We observed longitudinal acoustic waves (the transient density response) and thermal diffusion (leading to the decay of the steady-state density response). The speed of sound and acoustic attenuation rate were determined in the frequency range 57 MHz - 1.4 GHz. From the decay of the steady state response the thermal diffusivities were detremined.