Ag3AsS3-As2S3 composite: Detailed impedance spectroscopy study

The 90% Ag3AsS3-10 % As2S3 composite and Proustite (Ag3AsS3) were investigated by impedance spectroscopy. Electrical properties of single crystal Proustite were investigated by 2 and 4 probe methods in the frequency range 10 Hz to 2 MHz and in the temperature interval from 300 K up to 480 K. The 90% Ag3AsS3-10 % As2S3 composite was investigated by 2 electrode method in the frequency range 10 Hz to 3 GHz and in the temperature interval from 300 K up to 400 K. Equivalent circuit explaining electrical conductivity mechanism in Ag3AsS3-As2S3 composite, taking in to account possible microstructure of the obtained sample and the interrelation of the composite constituents, was proposed. It was suggested that overall electrical conductivity of Ag3AsS3-As2S3 composite can be increased by small amount of As2S3, which gets doped with Ag+ ions from Ag3AsS3.