The Hall Carrier Mobility of AgBiTe_2-Ag_2Te Composite

摘要

We prepared a series of (AgBiTe_2)_(1-x)(Ag_2Te)_x (0≤x≤l) composite materials by melt and cool down. The Hall coefficient and the electrical conductivity were measured by the standard van der Pauw technique over the temperature range from 93K to 283K from which the Hall carrier mobility was calculated. Ag_2Te had the highest mobility while the mobility of AgBiTe_2 was the lowest of all samples at 283K. However the mobility of the (AgBiTe_2)_(0.125)(Ag_2Te)_(0.875) composite material was higher than the motility of Ag_2Te below 243K. It seems that a small second phase dispersed in the matrix phase is effective against the increased mobility.