Conductivity of the chalcogenide semi-insulator system: As2S3Sb2S3

The conductivities of mixed As₂S₃Sb₂S₃ thin films are discussed. Temperature independent a.c. data are interpreted in terms of a hopping mechanism where correlation effects are important. Excepting As₂S₃, which exhibits extrinsic behaviour, the dielectric constant, a.c. conductivity and d.c. conductivity pre-exponential factor, all scale approximately linearly with composition.